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Author SHA1 Message Date
Peter Rosin a5306b8034 i2c: mux: pca9541: make use of __i2c_smbus_xfer 
This simplifies the code, and you get retries for free if the adapter
does not support ->master_xfer.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-07-03 22:57:39 +02:00
Peter Rosin d7a0aef296 i2c: mux: mlxcpld: make use of __i2c_smbus_xfer 
This simplifies the code, and you get retries for free if the adapter
does not support ->master_xfer.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-07-03 22:57:32 +02:00
Peter Rosin 63453b59e4 i2c: smbus: add unlocked __i2c_smbus_xfer variant 
Removes all locking from i2c_smbus_xfer and renames it to __i2c_smbus_xfer,
then adds a new i2c_smbus_xfer function that simply grabs the lock while
calling the unlocked variant.

This is not perfectly equivalent, since i2c_smbus_xfer was callable from
atomic/irq context if you happened to end up emulating SMBus with an I2C
transfer, and that is no longer the case with this patch. It is unknown
(to me) if anything depends on that quirk, but it seems fragile enough to
simply break those cases and require them to call i2c_transfer directly
instead.

While at it, for consistency rename the 2nd to last argument (size) of
the i2c_smbus_xfer declaration to protocol and remove the surplus extern
marker.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-07-03 22:57:25 +02:00
Hans de Goede b3a653288e i2c-cht-wc: Fix bq24190 supplier 
Commit f2a8aa053c ("typec: tcpm: Represent source supply through
power_supply") moved the code to register a power_supply representing
the device supplying power to the type-C connector, from the fusb302
code to the generic tcpm code.

This has caused the power-supply registered by the fusb302 driver,
which determines how much current the bq24190 can draw, to change name
from "fusb302-typec-source" to "tcpm-source-psy-i2c-fusb302".

Fixes: f2a8aa053c ("typec: tcpm: Represent source supply through...")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-07-02 17:38:07 +02:00
Wolfram Sang 12b731dd46 i2c: gpio: initialize SCL to HIGH again 
It seems that during the conversion from gpio* to gpiod*, the initial
state of SCL was wrongly switched to LOW. Fix it to be HIGH again.

Fixes: 7bb75029ef ("i2c: gpio: Enforce open drain through gpiolib")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-06-29 08:23:12 +02:00
Peter Rosin 9aa613674f i2c: smbus: kill memory leak on emulated and failed DMA SMBus xfers 
If DMA safe memory was allocated, but the subsequent I2C transfer
fails the memory is leaked. Plug this leak.

Fixes: 8a77821e74 ("i2c: smbus: use DMA safe buffers for emulated SMBus transactions")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-06-29 08:19:52 +02:00
Wolfram Sang 2173ed0adc i2c: algos: bit: mention our experience about initial states 
So, if somebody wants to re-implement this in the future, we pinpoint to
a problem case.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-06-29 08:19:51 +02:00
Wolfram Sang 2a2c8ee2d7 Revert "i2c: algo-bit: init the bus to a known state" 
This reverts commit 3e5f06bed7. As per
bugzilla #200045, this caused a regression. I don't really see a way to
fix it without having the hardware. So, revert the patch and I will fix
the issue I was seeing originally in the i2c-gpio driver itself. I
couldn't find new users of this algorithm since, so there should be no
one depending on the new behaviour.

Reported-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Fixes: 3e5f06bed7 ("i2c: algo-bit: init the bus to a known state")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-06-29 08:19:41 +02:00
Linus Torvalds 9bca19a01d Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 
Pull i2c updates from Wolfram Sang:

 - mainly feature additions to drivers (stm32f7, qup, xlp9xx, mlxcpld, ...)

 - conversion to use the i2c_8bit_addr_from_msg macro consistently

 - move includes to platform_data

 - core updates to allow the (still in review) I3C subsystem to connect

 - and the regular share of smaller driver updates

* 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (68 commits)
  i2c: qup: fix building without CONFIG_ACPI
  i2c: tegra: Remove suspend-resume
  i2c: imx-lpi2c: Switch to SPDX identifier
  i2c: mxs: Switch to SPDX identifier
  i2c: busses: make use of i2c_8bit_addr_from_msg
  i2c: algos: make use of i2c_8bit_addr_from_msg
  i2c: rcar: document R8A77980 bindings
  i2c: qup: Add command-line parameter to override SCL frequency
  i2c: qup: Correct duty cycle for FM and FM+
  i2c: qup: Add support for Fast Mode Plus
  i2c: qup: add probe path for Centriq ACPI devices
  i2c: robotfuzz-osif: drop pointless test
  i2c: robotfuzz-osif: remove pointless local variable
  i2c: rk3x: Don't print visible virtual mapping MMIO address
  i2c: opal: don't check number of messages in the driver
  i2c: ibm_iic: don't check number of messages in the driver
  i2c: imx: Switch to SPDX identifier
  i2c: mux: pca954x: merge calls to of_match_device and of_device_get_match_data
  i2c: mux: demux-pinctrl: use proper parent device for demux adapter
  i2c: mux: improve error message for failed symlink
  ...
 2018-06-14 16:21:46 +09:00
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        devm_kzalloc(handle, 4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@

(
  devm_kzalloc(HANDLE,
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  devm_kzalloc(HANDLE,
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
 2018-06-12 16:19:22 -07:00
Kees Cook 6396bb2215 treewide: kzalloc() -> kcalloc() 
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
 2018-06-12 16:19:22 -07:00
Kees Cook 6da2ec5605 treewide: kmalloc() -> kmalloc_array() 
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:

        kmalloc(a * b, gfp)

with:
        kmalloc_array(a * b, gfp)

as well as handling cases of:

        kmalloc(a * b * c, gfp)

with:

        kmalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kmalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kmalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kmalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kmalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kmalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kmalloc
+ kmalloc_array
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kmalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kmalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kmalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kmalloc(sizeof(THING) * C2, ...)
|
  kmalloc(sizeof(TYPE) * C2, ...)
|
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
 2018-06-12 16:19:22 -07:00
Linus Torvalds 07c4dd3435 USB/PHY patches for 4.18-rc1 
Here is the big USB pull request for 4.18-rc1.
 
 Lots of stuff here, the highlights are:
 	- phy driver updates and new additions
 	- usual set of xhci driver updates
 	- normal set of musb updates
 	- gadget driver updates and new controllers
 	- typec work, it's getting closer to getting fully out of the
 	  staging portion of the tree.
 	- lots of minor cleanups and bugfixes.
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB and PHY updates from Greg KH:
 "Here is the big USB pull request for 4.18-rc1.

  Lots of stuff here, the highlights are:

   - phy driver updates and new additions

   - usual set of xhci driver updates

   - normal set of musb updates

   - gadget driver updates and new controllers

   - typec work, it's getting closer to getting fully out of the staging
     portion of the tree.

   - lots of minor cleanups and bugfixes.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'usb-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (263 commits)
  Revert "xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue"
  xhci: Add quirk to zero 64bit registers on Renesas PCIe controllers
  xhci: Allow more than 32 quirks
  usb: xhci: force all memory allocations to node
  selftests: add test for USB over IP driver
  USB: typec: fsusb302: no need to check return value of debugfs_create_dir()
  USB: gadget: udc: s3c2410_udc: no need to check return value of debugfs_create functions
  USB: gadget: udc: renesas_usb3: no need to check return value of debugfs_create functions
  USB: gadget: udc: pxa27x_udc: no need to check return value of debugfs_create functions
  USB: gadget: udc: gr_udc: no need to check return value of debugfs_create functions
  USB: gadget: udc: bcm63xx_udc: no need to check return value of debugfs_create functions
  USB: udc: atmel_usba_udc: no need to check return value of debugfs_create functions
  USB: dwc3: no need to check return value of debugfs_create functions
  USB: dwc2: no need to check return value of debugfs_create functions
  USB: core: no need to check return value of debugfs_create functions
  USB: chipidea: no need to check return value of debugfs_create functions
  USB: ehci-hcd: no need to check return value of debugfs_create functions
  USB: fhci-hcd: no need to check return value of debugfs_create functions
  USB: fotg210-hcd: no need to check return value of debugfs_create functions
  USB: imx21-hcd: no need to check return value of debugfs_create functions
  ...
 2018-06-05 16:14:12 -07:00
Linus Torvalds 3c89adb0d1 Power management updates for 4.18-rc1 
These include a significant update of the generic power domains (genpd)
 and Operating Performance Points (OPP) frameworks, mostly related to
 the introduction of power domain performance levels, cpufreq updates
 (new driver for Qualcomm Kryo processors, updates of the existing
 drivers, some core fixes, schedutil governor improvements), PCI power
 management fixes, ACPI workaround for EC-based wakeup events handling
 on resume from suspend-to-idle, and major updates of the turbostat
 and pm-graph utilities.
 
 Specifics:
 
  - Introduce power domain performance levels into the the generic
    power domains (genpd) and Operating Performance Points (OPP)
    frameworks (Viresh Kumar, Rajendra Nayak, Dan Carpenter).
 
  - Fix two issues in the runtime PM framework related to the
    initialization and removal of devices using device links (Ulf
    Hansson).
 
  - Clean up the initialization of drivers for devices in PM domains
    (Ulf Hansson, Geert Uytterhoeven).
 
  - Fix a cpufreq core issue related to the policy sysfs interface
    causing CPU online to fail for CPUs sharing one cpufreq policy in
    some situations (Tao Wang).
 
  - Make it possible to use platform-specific suspend/resume hooks
    in the cpufreq-dt driver and make the Armada 37xx DVFS use that
    feature (Viresh Kumar, Miquel Raynal).
 
  - Optimize policy transition notifications in cpufreq (Viresh Kumar).
 
  - Improve the iowait boost mechanism in the schedutil cpufreq
    governor (Patrick Bellasi).
 
  - Improve the handling of deferred frequency updates in the
    schedutil cpufreq governor (Joel Fernandes, Dietmar Eggemann,
    Rafael Wysocki, Viresh Kumar).
 
  - Add a new cpufreq driver for Qualcomm Kryo (Ilia Lin).
 
  - Fix and clean up some cpufreq drivers (Colin Ian King, Dmitry
    Osipenko, Doug Smythies, Luc Van Oostenryck, Simon Horman,
    Viresh Kumar).
 
  - Fix the handling of PCI devices with the DPM_SMART_SUSPEND flag
    set and update stale comments in the PCI core PM code (Rafael
    Wysocki).
 
  - Work around an issue related to the handling of EC-based wakeup
    events in the ACPI PM core during resume from suspend-to-idle if
    the EC has been put into the low-power mode (Rafael Wysocki).
 
  - Improve the handling of wakeup source objects in the PM core (Doug
    Berger, Mahendran Ganesh, Rafael Wysocki).
 
  - Update the driver core to prevent deferred probe from breaking
    suspend/resume ordering (Feng Kan).
 
  - Clean up the PM core somewhat (Bjorn Helgaas, Ulf Hansson, Rafael
    Wysocki).
 
  - Make the core suspend/resume code and cpufreq support the RT patch
    (Sebastian Andrzej Siewior, Thomas Gleixner).
 
  - Consolidate the PM QoS handling in cpuidle governors (Rafael
    Wysocki).
 
  - Fix a possible crash in the hibernation core (Tetsuo Handa).
 
  - Update the rockchip-io Adaptive Voltage Scaling (AVS) driver
    (David Wu).
 
  - Update the turbostat utility (fixes, cleanups, new CPU IDs, new
    command line options, built-in "Low Power Idle" counters support,
    new POLL and POLL% columns) and add an entry for it to MAINTAINERS
    (Len Brown, Artem Bityutskiy, Chen Yu, Laura Abbott, Matt Turner,
    Prarit Bhargava, Srinivas Pandruvada).
 
  - Update the pm-graph to version 5.1 (Todd Brandt).
 
  - Update the intel_pstate_tracer utility (Doug Smythies).
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Merge tag 'pm-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "These include a significant update of the generic power domains
  (genpd) and Operating Performance Points (OPP) frameworks, mostly
  related to the introduction of power domain performance levels,
  cpufreq updates (new driver for Qualcomm Kryo processors, updates of
  the existing drivers, some core fixes, schedutil governor
  improvements), PCI power management fixes, ACPI workaround for
  EC-based wakeup events handling on resume from suspend-to-idle, and
  major updates of the turbostat and pm-graph utilities.

  Specifics:

   - Introduce power domain performance levels into the the generic
     power domains (genpd) and Operating Performance Points (OPP)
     frameworks (Viresh Kumar, Rajendra Nayak, Dan Carpenter).

   - Fix two issues in the runtime PM framework related to the
     initialization and removal of devices using device links (Ulf
     Hansson).

   - Clean up the initialization of drivers for devices in PM domains
     (Ulf Hansson, Geert Uytterhoeven).

   - Fix a cpufreq core issue related to the policy sysfs interface
     causing CPU online to fail for CPUs sharing one cpufreq policy in
     some situations (Tao Wang).

   - Make it possible to use platform-specific suspend/resume hooks in
     the cpufreq-dt driver and make the Armada 37xx DVFS use that
     feature (Viresh Kumar, Miquel Raynal).

   - Optimize policy transition notifications in cpufreq (Viresh Kumar).

   - Improve the iowait boost mechanism in the schedutil cpufreq
     governor (Patrick Bellasi).

   - Improve the handling of deferred frequency updates in the schedutil
     cpufreq governor (Joel Fernandes, Dietmar Eggemann, Rafael Wysocki,
     Viresh Kumar).

   - Add a new cpufreq driver for Qualcomm Kryo (Ilia Lin).

   - Fix and clean up some cpufreq drivers (Colin Ian King, Dmitry
     Osipenko, Doug Smythies, Luc Van Oostenryck, Simon Horman, Viresh
     Kumar).

   - Fix the handling of PCI devices with the DPM_SMART_SUSPEND flag set
     and update stale comments in the PCI core PM code (Rafael Wysocki).

   - Work around an issue related to the handling of EC-based wakeup
     events in the ACPI PM core during resume from suspend-to-idle if
     the EC has been put into the low-power mode (Rafael Wysocki).

   - Improve the handling of wakeup source objects in the PM core (Doug
     Berger, Mahendran Ganesh, Rafael Wysocki).

   - Update the driver core to prevent deferred probe from breaking
     suspend/resume ordering (Feng Kan).

   - Clean up the PM core somewhat (Bjorn Helgaas, Ulf Hansson, Rafael
     Wysocki).

   - Make the core suspend/resume code and cpufreq support the RT patch
     (Sebastian Andrzej Siewior, Thomas Gleixner).

   - Consolidate the PM QoS handling in cpuidle governors (Rafael
     Wysocki).

   - Fix a possible crash in the hibernation core (Tetsuo Handa).

   - Update the rockchip-io Adaptive Voltage Scaling (AVS) driver (David
     Wu).

   - Update the turbostat utility (fixes, cleanups, new CPU IDs, new
     command line options, built-in "Low Power Idle" counters support,
     new POLL and POLL% columns) and add an entry for it to MAINTAINERS
     (Len Brown, Artem Bityutskiy, Chen Yu, Laura Abbott, Matt Turner,
     Prarit Bhargava, Srinivas Pandruvada).

   - Update the pm-graph to version 5.1 (Todd Brandt).

   - Update the intel_pstate_tracer utility (Doug Smythies)"

* tag 'pm-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (128 commits)
  tools/power turbostat: update version number
  tools/power turbostat: Add Node in output
  tools/power turbostat: add node information into turbostat calculations
  tools/power turbostat: remove num_ from cpu_topology struct
  tools/power turbostat: rename num_cores_per_pkg to num_cores_per_node
  tools/power turbostat: track thread ID in cpu_topology
  tools/power turbostat: Calculate additional node information for a package
  tools/power turbostat: Fix node and siblings lookup data
  tools/power turbostat: set max_num_cpus equal to the cpumask length
  tools/power turbostat: if --num_iterations, print for specific number of iterations
  tools/power turbostat: Add Cannon Lake support
  tools/power turbostat: delete duplicate #defines
  x86: msr-index.h: Correct SNB_C1/C3_AUTO_UNDEMOTE defines
  tools/power turbostat: Correct SNB_C1/C3_AUTO_UNDEMOTE defines
  tools/power turbostat: add POLL and POLL% column
  tools/power turbostat: Fix --hide Pk%pc10
  tools/power turbostat: Build-in "Low Power Idle" counters support
  tools/power turbostat: Don't make man pages executable
  tools/power turbostat: remove blank lines
  tools/power turbostat: a small C-states dump readability immprovement
  ...
 2018-06-05 09:38:39 -07:00
Rafael J. Wysocki 5b550c92d7 Merge branch 'pm-domains' 
* pm-domains:
  PM / domains: Improve wording of dev_pm_domain_attach() comment
  PM / Domains: Don't return -EEXIST at attach when PM domain exists
  spi: Respect all error codes from dev_pm_domain_attach()
  soundwire: Respect all error codes from dev_pm_domain_attach()
  mmc: sdio: Respect all error codes from dev_pm_domain_attach()
  i2c: Respect all error codes from dev_pm_domain_attach()
  driver core: Respect all error codes from dev_pm_domain_attach()
  amba: Respect all error codes from dev_pm_domain_attach()
  PM / Domains: Allow a better error handling of dev_pm_domain_attach()
  PM / Domains: Check for existing PM domain in dev_pm_domain_attach()
  PM / Domains: Drop redundant code in genpd while attaching devices
  PM / Domains: Drop comment in genpd about legacy Samsung DT binding
  PM / Domains: Fix error path during attach in genpd
 2018-06-04 10:40:33 +02:00
Arnd Bergmann 53e39628ac i2c: qup: fix building without CONFIG_ACPI 
The added Centriq support broke compilation with CONFIG_ACPI disabled:

drivers/i2c/busses/i2c-qup.c: In function 'qup_i2c_probe':
drivers/i2c/busses/i2c-qup.c:1707:25: error: 'qup_i2c_acpi_match' undeclared (first use in this function); did you mean 'qup_i2c_recv_data'?

This fixes it by removing the extraneous #ifdef. All ACPI specific
code will be dropped implicitly when that option is disabled, but
the compiler first needs to see it.

Fixes: 902a91a02b ("i2c: qup: add probe path for Centriq ACPI devices")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-31 23:21:00 +02:00
Dmitry Osipenko 535ba90472 i2c: tegra: Remove suspend-resume 
Nothing prevents I2C clients to access I2C while Tegra's driver is being
suspended, this results in -EBUSY error returned to the clients and that
may have unfortunate consequences. In particular this causes problems
for the TPS6586x MFD driver which emits hundreds of "failed to read
interrupt status" error messages on resume from suspend. This happens if
TPS6586X is used to wake system from suspend by the expired RTC alarm
timer because TPS6586X is an I2C device driver and its IRQ handler reads
the status register while Tegra's I2C driver is suspended, i.e. just after
kernel enabled IRQ's during of resume-from-suspend process.

Note that the removed tegra_i2c_resume() invoked tegra_i2c_init() which
performs HW reset. That seems was also not entirely correct because moving
tegra_i2c_resume to an earlier stage of resume-from-suspend process causes
I2C transfer to fail in the case of TPS6586X. It is fine to remove the
HW-reinitialization for now because it should be only needed in a case of
using lowest power-mode during suspend, which upstream kernel doesn't
support.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-30 22:20:09 +02:00
Fabio Estevam eedeaed289 i2c: imx-lpi2c: Switch to SPDX identifier 
Adopt the SPDX license identifier headers to ease license compliance
management.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-30 22:13:27 +02:00
Fabio Estevam ed49aaeefd i2c: mxs: Switch to SPDX identifier 
Adopt the SPDX license identifier headers to ease license compliance
management.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-30 22:12:41 +02:00
Wolfram Sang 03828ceee6 Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-4.18 
This time around we have mostly trivial changes. However, there are
also a couple of "real" patches improving a few aspects of the
demux-pinctrl behavior and we also actually reset pca954x chips on
probe when we have the ability to do so.
 2018-05-30 22:11:02 +02:00
Peter Rosin 30a6475744 i2c: busses: make use of i2c_8bit_addr_from_msg 
Because it looks neater.

For diolan, this allows factoring out some code that is now common
between if and else.

For eg20t, pch_i2c_writebytes is always called with a write in
msgs->flags, and pch_i2c_readbytes with a read.

For imx, i2c_imx_dma_write and i2c_imx_write are always called with a
write in msgs->flags, and i2c_imx_read with a read.

For qup, qup_i2c_write_tx_fifo_v1 is always called with a write in
qup->msg->flags.

For stu300, also restructure debug output for resends, since that
code as a result is only handling debug output.

Reviewed-by: Guenter Roeck <linux@roeck-us.net> [diolan]
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> [efm32 and imx]
Acked-by: Linus Walleij <linus.walleij@linaro.org> [stu300]
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 20:30:49 +02:00
Peter Rosin ac6d5298f6 i2c: algos: make use of i2c_8bit_addr_from_msg 
Because it looks neater.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 20:30:06 +02:00
Federico Vaga a0ccb6b54b i2c: ocores: update HDL sources URL 
The URL is broken. This patch fixes it.

Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
[wsa: shortened the URL a bit]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 20:14:32 +02:00
Austin Christ d9f52281bc i2c: qup: Add command-line parameter to override SCL frequency 
Add a module parameter to override SCL frequency provided by firmware.
This can be useful when testing spec compliance for I2C modes or when
debugging issues across multiple operating frequencies.

Signed-off-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 19:58:50 +02:00
Austin Christ 71fbafcc45 i2c: qup: Correct duty cycle for FM and FM+ 
The I2C spec UM10204 Rev. 6 specifies the following timings.

           Standard      Fast Mode     Fast Mode Plus
SCL low    4.7us         1.3us         0.5us
SCL high   4.0us         0.6us         0.26us

This results in a 33%/66% duty cycle as opposed to the 50%/50% duty cycle
used for Standard-mode.

Add High Time Divider settings to correct duty cycle for FM(400kHz) and
FM+(1MHz).

Signed-off-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 19:53:03 +02:00
Austin Christ 109b8c42b7 i2c: qup: Add support for Fast Mode Plus 
Previously the QUP driver limited operation mode to I2C Fast Mode. Add
Fast Mode Plus functionality by raising SCL limit from 400kHz to 1MHz.

Signed-off-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 19:52:14 +02:00
Austin Christ 902a91a02b i2c: qup: add probe path for Centriq ACPI devices 
Add support for Qualcomm Centriq devices that are qup-v2 compatible but
do not support DMA, so nodma needs to be set.

Signed-off-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-29 19:51:17 +02:00
Peter Rosin 6a0c0d0d00 i2c: robotfuzz-osif: drop pointless test 
In the for-loop test, ret will be either 0 or 1. So, the
comparison is pointless. Drop it, and drop the initializer
which is then also pointless.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-24 22:13:04 +02:00
Peter Rosin 7fb29b958d i2c: robotfuzz-osif: remove pointless local variable 
Just use the value directly instead of assigning it to a
variable first. And then drop the unused variable.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-24 22:12:24 +02:00
Shawn Lin 17dd94796c i2c: rk3x: Don't print visible virtual mapping MMIO address 
Now %p doesn't print visible pointer address unless the user
really want it. According to Documentation/core-api/printk-formats.rst,
%px should be used instead, otherwise we could see:

rk3x-i2c ff110000.i2c: Initialized RK3xxx I2C bus at (____ptrval____)
rk3x-i2c ff130000.i2c: Initialized RK3xxx I2C bus at (____ptrval____)
rk3x-i2c ff3c0000.i2c: Initialized RK3xxx I2C bus at (____ptrval____)
rk3x-i2c ff3d0000.i2c: Initialized RK3xxx I2C bus at (____ptrval____)

But I don't really understand why we need dump it in the first place!
Let's remove the whole pointless log.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-24 22:09:05 +02:00
Wolfram Sang 05d4707d46 i2c: opal: don't check number of messages in the driver 
Since commit 1eace8344c ("i2c: add param sanity check to
i2c_transfer()") and b7f6258402 ("i2c: add quirk checks to core"), the
I2C core does this check now. We can remove it here.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Peter Rosin <peda@axentia.se>
 2018-05-24 22:06:17 +02:00
Wolfram Sang c216b87065 i2c: ibm_iic: don't check number of messages in the driver 
Since commit 1eace8344c ("i2c: add param sanity check to
i2c_transfer()"), the I2C core does this check now. We can remove it
from drivers.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Peter Rosin <peda@axentia.se>
 2018-05-24 22:05:54 +02:00
Fabio Estevam ef9fc0bad5 i2c: imx: Switch to SPDX identifier 
Adopt the SPDX license identifier headers to ease license compliance
management.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-24 22:04:34 +02:00
Heikki Krogerus 7c8d44566d platform: x86: intel_cht_int33fe: Fix dependencies 
The driver will not probe unless bq24190 is loaded, so
making it a dependency.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-24 18:17:00 +02:00
Julia Lawall b10d7a1fd6 i2c: mux: pca954x: merge calls to of_match_device and of_device_get_match_data 
Drop call to of_match_device, which is subsumed by the subsequent
call to of_device_get_match_data.  The code becomes simpler, and a
temporary variable can be dropped.

The semantic match that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
local idexpression match;
identifier i;
expression x, dev, e, e1;
@@
-        match@i = of_match_device(x, dev);
-        if (match) e = of_device_get_match_data(dev);
-        else e = e1;
+        e = of_device_get_match_data(dev);
+        if (!e) e = e1;

@@
identifier r.i;
@@
- const struct of_device_id *i;
... when != i
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-24 13:51:25 +02:00
Wolfram Sang 5a9dcd8190 i2c: mux: demux-pinctrl: use proper parent device for demux adapter 
Due to a typo, the wrong parent device was assigned to the newly created
demuxing adapter device. It got connected to the demuxing platform
device but not to the selected parent I2C adapter device. Fix it to get
a proper parent-child relationship of the demuxed busses.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-24 13:45:04 +02:00
Wolfram Sang f657c9fe26 i2c: mux: improve error message for failed symlink 
Trivial, but still: the failed symlink is not *for* the channel but a
link *to* the channel.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-24 13:42:40 +02:00
Markus Elfring b30c08a24c i2c: mux: reg: failed memory allocation is logged elsewhere 
Omit an extra message for a memory allocation failure in this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-24 13:14:21 +02:00
George Cherian 88b4116e7e i2c: xlp9xx: Make sure the transfer size is not more than I2C_SMBUS_BLOCK_SIZE 
For SMBus transactions the max permissible transfer size is
I2C_SMBUS_BLOCK_SIZE. It is possible that some clients might
not follow it strictly occasionally.
This would lead to stack corruption if the driver copies more than
I2C_SMBUS_BLOCK_SIZE bytes. Add a check to avoid such conditions.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-22 14:06:34 +02:00
George Cherian 8d504d804a i2c: xlp9xx: Fix issue seen when updating receive length 
The hardware does not handle updates to the length register gracefully
if the new value is less than the number of bytes received so far. If
this happens, the i2c controller will not stop the receive transaction
properly.

Fix this by ensuring that the updated length is ok. This is done by
making sure that the new length written to hardware is at least few
bytes more than the bytes received so far.

While at that refactor the length updation to a new function.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-22 14:06:25 +02:00
George Cherian 40f4e372cb i2c: xlp9xx: Add support for SMBAlert 
Add support for SMBus alert mechanism to i2c-xlp9xx driver.
The second interrupt is parsed to use for SMBus alert.
The first interrupt is the i2c controller main interrupt.

Signed-off-by: Kamlakant Patel <kamlakant.patel@cavium.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-22 14:06:10 +02:00
Boris Brezillon da0086d018 i2c: Export of_i2c_get_board_info() 
I3C busses have to know about all I2C devices connected on the I3C bus
to properly initialize the I3C master, and I2C frames can't be sent on
the bus until this initialization is done.

We can't let the I2C core parse the DT and instantiate I2C devices as
part of its i2c_add_adapter() procedure because, when done this way,
I2C devices are directly registered to the device-model and might be
attached to drivers which could in turn start sending frames on the bus,
which won't work since, as said above, the bus is not yet initialized.

Export of_i2c_register_device() in order to let the I3C core parse the
I2C device nodes by itself and initialize the bus.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-22 13:42:16 +02:00
Boris Brezillon 0478226564 i2c: Retain info->of_node in i2c_new_device() 
Currently, of_i2c_register_devices() is responsible for retaining
info->of_node, but we're about to expose a function to parse I2C board
info without registering the I2C device.

We could possibly let this function retain ->of_node, but this approach
is prone to reference leak since people will have to remember to call
of_node_put() if something goes wrong between the OF node parsing and
the registration step.
Let's just retain the ->of_node in i2c_new_register() instead.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-22 13:40:25 +02:00
Mike Looijmans a2f8445d4c i2c: mux: pca954x: force reset on probe if available 
Instead of just hogging the reset GPIO into deactivated state, activate and
then de-activate the reset. This allows for better recovery if the CPU was
reset halfway through an I2C transaction for example.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-19 23:54:47 +02:00
Wolfram Sang fca700d6d2 i2c: mux: demux-pinctrl: disable PM user interface 
The demux device is only a logical device with no children. So, no
RuntimePM is needed, let's disable the sysfs interface for it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-19 23:54:36 +02:00
Peter Rosin f56f316dcf i2c: mux: ltc4306: switch to using .probe_new 
Use the new probe style for i2c drivers.

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-05-19 23:54:30 +02:00
Wolfram Sang 3d8b7a4ea3 Merge branch 'i2c/platform_data-immutable' into i2c/for-4.18 2018-05-17 16:29:19 +02:00
Wolfram Sang caaccda136 i2c: pnx: move header into the driver 
There are no platform_data users anymore. Move the structs into the
driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
 2018-05-17 16:27:59 +02:00
Wolfram Sang 7072b75c15 i2c: xiic: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
 2018-05-17 16:27:59 +02:00
Wolfram Sang e5c7137793 i2c: pca-platform: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 16:27:58 +02:00
Wolfram Sang 79fc540fd5 i2c: omap: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Tony Lindgren <tony@atomide.com>
 2018-05-17 16:27:58 +02:00
Wolfram Sang 985ecf0037 i2c: ocores: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
 2018-05-17 16:27:57 +02:00
Wolfram Sang 62ea22c495 i2c: mux: gpio: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Peter Korsgaard <peter.korsgaard@barco.com>
 2018-05-17 16:27:52 +02:00
Wolfram Sang 1e9d42194e i2c: gpio: move header to platform_data 
This header only contains platform_data. Move it to the proper directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: James Hogan <jhogan@kernel.org>
Acked-by: Greg Ungerer <gerg@uclinux.org>
 2018-05-17 16:27:09 +02:00
Pierre-Yves MORDRET c599eb4ff6 i2c: stm32f7: fix documentation typo 
Some data structure members were either misspelled or missing.

Fixes: aeb068c572 ("i2c: i2c-stm32f7: add driver")
Fixes: 380b8a85e7 ("i2c: i2c-stm32f7: Add initial SMBus protocols support")
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 15:59:02 +02:00
Anders Roxell 4b2f9bd5e3 i2c: i801: fix unused-function warning 
With CONFIG_PM, we get a harmless build warning:
drivers/i2c/busses/i2c-i801.c:1723:12: warning: ‘i801_resume’ defined but not used [-Wunused-function]
 static int i801_resume(struct device *dev)
            ^~~~~~~~~~~
drivers/i2c/busses/i2c-i801.c:1714:12: warning: ‘i801_suspend’ defined but not used [-Wunused-function]
 static int i801_suspend(struct device *dev)
            ^~~~~~~~~~~~

Follow design pattern from other drivers like i2c-brcmstb, i2c-mpc,
i2c-ocores, i2c-pnx, i2c-puv3, i2c-st, i2c-stu300 and i2c-mux-pca954x
and changing the ifdef CONFIG_PM to CONFIG_PM_SLEEP.

Fixes: a9c8088c79 ("i2c: i801: Don't restore config registers on runtime PM")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 15:54:12 +02:00
Colin Ian King 1ee7cdbfcd i2c: xiic: fix spelling mistake: "unexpexted" -> "unexpected" 
Trivial fix to spelling mistakes in dev_dbg messages

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 15:51:59 +02:00
Peter Rosin 5e87270bec i2c: synquacer: fix fence-post error in retry loop 
There is a difference between attempts and retries.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 15:40:33 +02:00
Wenwen Wang 8e03477cb7 i2c: core: smbus: fix a potential missing-check bug 
In i2c_smbus_xfer_emulated(), the function i2c_transfer() is invoked to
transfer i2c messages. The number of actual transferred messages is
returned and saved to 'status'. If 'status' is negative, that means an
error occurred during the transfer process. In that case, the value of
'status' is an error code to indicate the reason of the transfer failure.
In most cases, i2c_transfer() can transfer 'num' messages with no error.
And so 'status' == 'num'. However, due to unexpected errors, it is probable
that only partial messages are transferred by i2c_transfer(). As a result,
'status' != 'num'. This special case is not checked after the invocation of
i2c_transfer() and can potentially lead to unexpected issues in the
following execution since it is expected that 'status' == 'num'.

This patch checks the return value of i2c_transfer() and returns an error
code -EIO if the number of actual transferred messages 'status' is not
equal to 'num'.

Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-17 15:40:12 +02:00
Peter Rosin a5dab8698c i2c: hix5hd2: remove some dead code 
The else branch cannot be taken as i will always equal num.
Get rid of the whole construct.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-15 10:43:38 +02:00
Andrzej Hajda 043056270b i2c: exynos5: simplify transfer function 
exynos5_i2c_xfer contains lots of dead code, let's remove it and simplify
the rest. The patch should not introduce functional changes.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Suggested-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Andi Shyti <andi@etezian.org>
Reviewed-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-15 10:43:38 +02:00
Boris Brezillon 4fad8868af i2c: Get rid of i2c_board_info->archdata 
The only user of i2c_board_info->archdata is the OF parsing code and it
just pass a zero-initialized object which has the same effect as leaving
->archdata to NULL since the client object is allocated with kzalloc().

Get rid of this useless field.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-15 10:42:20 +02:00
Alexander Monakov 9f4659ba38 i2c: designware: refactor low-level enable/disable 
Low-level controller enable function __i2c_dw_enable is overloaded to
also handle disabling. What's worse, even though the documentation
requires polling the IC_ENABLE_STATUS register when disabling, this
is not done: polling needs to be requested specifically by calling
__i2c_dw_enable_and_wait, which can also poll on enabling, but that
doesn't work if the IC_ENABLE_STATUS register is not implemented.
This is quite confusing if not in fact backwards.

Especially since the documentation says that disabling should be
followed by polling, the driver should be using a separate function
where it does one-shot disables to make the optimization stand out.

This refactors the two functions so that requested status is given
in the name rather than in a boolean argument. Specifically:

 - __i2c_dw_enable: enable without polling (in accordance with docs)
 - __i2c_dw_disable: disable and do poll (also as suggested by docs)
 - __i2c_dw_disable_nowait: disable without polling (Linux-specific)

No functional change.

Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
[wsa: fixed blank lines in header file]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-15 10:42:19 +02:00
Wolfram Sang e6218bf390 Merge branch 'i2c/for-current-fixed' into i2c/for-4.18 2018-05-15 10:41:01 +02:00
Peter Rosin 35cd67a0ca i2c: viperboard: return message count on master_xfer success 
Returning zero is wrong in this case.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: 174a13aa86 ("i2c: Add viperboard i2c master driver")
 2018-05-15 09:31:26 +02:00
Peter Rosin 12d9bbc5a7 i2c: pmcmsp: fix error return from master_xfer 
Returning -1 (-EPERM) is not appropriate here, go with -EIO.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: 1b144df1d7 ("i2c: New PMC MSP71xx TWI bus driver")
 2018-05-15 09:31:19 +02:00
Peter Rosin de9a8634f1 i2c: pmcmsp: return message count on master_xfer success 
Returning zero is wrong in this case.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: 1b144df1d7 ("i2c: New PMC MSP71xx TWI bus driver")
 2018-05-15 09:30:34 +02:00
Ulf Hansson e6a20b6cd2 i2c: Respect all error codes from dev_pm_domain_attach() 
The limitation of being able to check only for -EPROBE_DEFER from
dev_pm_domain_attach() has been removed. Hence let's respect all error
codes and bail out accordingly.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 2018-05-14 22:58:45 +02:00
Alexander Monakov 06cb616b1b i2c: designware: fix poll-after-enable regression 
Not all revisions of DW I2C controller implement the enable status register.
On platforms where that's the case (e.g. BG2CD and SPEAr ARM SoCs), waiting
for enable will time out as reading the unimplemented register yields zero.

It was observed that reading the IC_ENABLE_STATUS register once suffices to
avoid getting it stuck on Bay Trail hardware, so replace polling with one
dummy read of the register.

Fixes: fba4adbbf6 ("i2c: designware: must wait for enable")
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Tested-by: Ben Gardner <gardner.ben@gmail.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-05-10 12:30:20 +02:00
Wolfram Sang 77bade677c i2c: busses: remove superfluous ignoring of children for RPM 
These days, the I2C core ensures that the embedded adapter device
ignores the PM states of its children already. Because the adapter
device is an opaque logical device, there is no need for drivers to
repeat that again.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-08 23:19:02 +02:00
Tobias Jordan e6faa71034 i2c: axxia: enable clock before calling clk_get_rate() 
axxia_i2c_init() uses clk_get_rate() for idev->i2c_clk. clk_get_rate()
should only be called if the clock is enabled, so ensure that by moving
the clk_prepare_enable() call before the call to axxia_i2c_init().

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 08678b850c ("i2c: axxia: Add I2C driver for AXM55xx")
Signed-off-by: Tobias Jordan <Tobias.Jordan@elektrobit.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-05-08 23:13:19 +02:00
Wolfram Sang b1437dcb97 i2c: rcar: enhance comment to avoid regressions 
Give a clear testcase for people wishing to change this code. It is also
a reminder for me if people ask about it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 11:14:35 +02:00
Hans de Goede 7781edaed6 i2c: core: ACPI: Log device not acking errors at dbg loglevel 
Unfortunately some DSDTs issue bogus i2c reads to non existing devices
resulting in -EREMOTEIO errors because the non existing device of course
does not ack.

This happens e.g. from the The Asus T100TA's _BIX method, the DSDT on
the T100TA defines 2 resources on the I2C1 bus:

        Name (EHID, ResourceTemplate ()
        {
            I2cSerialBusV2 (0x005B, ControllerInitiated, 0x00061A80,
                AddressingMode7Bit, "\\_SB.I2C1",
                0x00, ResourceConsumer, , Exclusive,
                )
        })
        OperationRegion (EHOR, GenericSerialBus, Zero, 0x0100)
        Field (EHOR, BufferAcc, NoLock, Preserve)
        {
            Connection (EHID),
            Offset (0x01),
            AccessAs (BufferAcc, AttribBytes (0x10)),
            ABCD,   8
        }

        Name (UMPC, ResourceTemplate ()
        {
            I2cSerialBusV2 (0x0066, ControllerInitiated, 0x00061A80,
                AddressingMode7Bit, "\\_SB.I2C1",
                0x00, ResourceConsumer, , Exclusive,
                )
        })

The _BIX method does a single read (on each BIX() call) from the EHID
device through the ABCD Field, only to completely ignore the result.
This read always fails as there is no i2c client at address 0x5b.

The _BIX method also does several reads from the UMPC device and actually
uses the results of those to provide battery information.

IIRC I've also seen some DSTDs which do an i2c read to detect if a device
is present, also leading to false positive errors being logged.

Esp. the _BIX use is problematic as the _BIX method gets called
periodically to monitor battery status.

This commit stops the logs from filling up with errors like these:

[   57.327858] i2c i2c-0: i2c read 16 bytes from client@0x5b starting at
               reg 0x1 failed, error: -121

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:53:31 +02:00
Hans de Goede c8016fa215 i2c: core: ACPI: Improve OpRegion read errors 
When we get an error doing an ACPI SerialBus I2C OpRegion read log some
useful details, like the client address and which register is being
read.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:53:26 +02:00
Michael Shych ae4aa68dd3 i2c: mlxcpld: Allow configurable adapter id for mlxcpld 
It allows mlxcpld driver to be connected to pre-defined adapter number
equal or greater than one, in order to avoid current limitation, assuming
usage of id number one only.

Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:29 +02:00
Michael Shych 845f2a6d00 i2c: mlxcpld: Fix adapter functionality support callback 
It fixes report about supported functionality.
Functionality can be different up to CPLD capability.

Fixes: 6bec23bff9 (i2c: mlxcpld: add master driver for mellanox systems)
Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Michael Shych c9bfdc7c16 i2c: mlxcpld: Add support for smbus block read transaction 
It adds support for smbus block read transaction. CPLD smbus block read bit
of capability register is verified during driver initialization, and driver
data is updated if such capability is available. In case an upper layer
requests a read transaction of length one and expects that length will be
the first received byte, driver will notify CPLD about SMBus block read
transaction flavor, so CPLD will know to execute such kind of transaction.

Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Michael Shych 313ce648b5 i2c: mlxcpld: Add support for extended transaction length for i2c-mlxcpld 
It adds support for extended length of read and write transactions.
New CPLD logic allows double size of the read and write transactions
length. This feature is verified through capability register, which is
renamed from unclear LPF_REG to CPBLTY_REG. Two bits 5 and 6 of these
register are used for length capability detection, while only 01
combination indicates support of extended transaction length.
Others mean lack of such support.

Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Ryder Lee 6e29577fc2 i2c: mediatek: use of_device_get_match_data() 
The usage of of_device_get_match_data() reduce the code size a bit.

Also, the only way to call mtk_i2c_probe() is to match an entry in
mtk_i2c_of_match[], so of_id cannot be NULL.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Krzysztof Kozlowski 952cfd1581 i2c: s3c2410: Remove support for Exynos5440 
The Exynos5440 is not actively developed, there are no development
boards available and probably there are no real products with it.
Remove wide-tree support for Exynos5440.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Jean Delvare a9c8088c79 i2c: i801: Don't restore config registers on runtime PM 
Restoring configuration registers is only needed when we hand control
to the firmware. This is never the case with runtime power
management. The device will autosuspend whenever not used, so avoid
useless register writes by defining suspend/resume only, and not
runtime_suspend/runtime_resume.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
David Engraf e8f39e9fc0 i2c: at91: Read all available bytes at once 
With FIFO enabled it is possible to read multiple bytes
at once in the interrupt handler as long as RXRDY is
set. This may also reduce the number of interrupts.

This patch polls RXRDY and reads all available bytes at
once.

Signed-off-by: David Engraf <david.engraf@sysgo.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
[wsa: reformatted comment]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Pierre-Yves MORDRET 562de4ff4c i2c: i2c-stm32f7: Implement I2C release mechanism 
Feature prevents I2C lock-ups. Mechanism resets I2C state machine
and releases SCL/SDA signals but preserves I2C registers.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Pierre-Yves MORDRET 7ecc8cfde5 i2c: i2c-stm32f7: Add DMA support 
This patch adds DMA support for i2c-stm32f7 driver

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:28 +02:00
Pierre-Yves MORDRET bb8822cbbc i2c: i2c-stm32: Add generic DMA API 
This patch adds a generic DMA API to implement DMA support for i2c-stm32fx
drivers

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:27 +02:00
Pierre-Yves MORDRET 9e48155f6b i2c: i2c-stm32f7: Add initial SMBus protocols support 
This patch adds SMBus support for I2C controller embedded in STM32F7 Soc.
All SMBus protocols are implemented except SMBus-specific protocols like
SMBus Host Notification and SMBus Alert protocols.

Implemented: SMBus Quick command, Send byte, Receive byte, Write byte/word,
read byte/word, Process call, Block write/read and Block write-block read
process call.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:27 +02:00
Pierre-Yves MORDRET 60d609f30d i2c: i2c-stm32f7: Add slave support 
This patch adds slave support for I2C controller embedded in STM32F7 SoC

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:27 +02:00
Pierre-Yves MORDRET 8c7ecc9953 i2c: i2c-stm32f7: Add 10-bit address support 
This patch adds support for 10-bit device address for STM32F7 I2C

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-30 10:39:27 +02:00
Baolin Wang 2a01046120 i2c: sprd: Fix the i2c count issue 
We found the I2C controller count register is unreliable sometimes,
that will cause I2C to lose data. Thus we can read the data count
from 'i2c_dev->count' instead of the I2C controller count register.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-27 14:12:43 +02:00
Baolin Wang da33aa03fa i2c: sprd: Prevent i2c accesses after suspend is called 
Add one flag to indicate if the i2c controller has been in suspend state,
which can prevent i2c accesses after i2c controller is suspended following
system suspend.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-27 14:12:17 +02:00
Alexander Popov 23a27722b5 i2c: dev: prevent ZERO_SIZE_PTR deref in i2cdev_ioctl_rdwr() 
i2cdev_ioctl_rdwr() allocates i2c_msg.buf using memdup_user(), which
returns ZERO_SIZE_PTR if i2c_msg.len is zero.

Currently i2cdev_ioctl_rdwr() always dereferences the buf pointer in case
of I2C_M_RD | I2C_M_RECV_LEN transfer. That causes a kernel oops in
case of zero len.

Let's check the len against zero before dereferencing buf pointer.

This issue was triggered by syzkaller.

Signed-off-by: Alexander Popov <alex.popov@linux.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[wsa: use '< 1' instead of '!' for easier readability]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-27 14:04:10 +02:00
Geert Uytterhoeven 14a8f0d88c i2c: Remove depends on HAS_DMA in case of platform dependency 
Remove dependencies on HAS_DMA where a Kconfig symbol depends on another
symbol that implies HAS_DMA, and, optionally, on "|| COMPILE_TEST".
In most cases this other symbol is an architecture or platform specific
symbol, or PCI.

Generic symbols and drivers without platform dependencies keep their
dependencies on HAS_DMA, to prevent compiling subsystems or drivers that
cannot work anyway.

This simplifies the dependencies, and allows to improve compile-testing.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-18 10:07:24 +02:00
Ard Biesheuvel 1eace8344c i2c: add param sanity check to i2c_transfer() 
The API docs describe i2c_transfer() as taking a pointer to an array
of i2c_msg containing at least 1 entry, but leaves it to the individual
drivers to sanity check the msgs and num parameters. Let's do this in
core code instead.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[wsa: changed '<= 0' to '< 1']
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-11 23:33:46 +02:00
Jean Delvare f7f6d915a1 i2c: i801: Restore configuration at shutdown 
On some systems, the BIOS expects certain SMBus register values to
match the hardware defaults. Restore these configuration registers at
shutdown time to avoid confusing the BIOS. This avoids hard-locking
such systems upon reboot.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@vger.kernel.org
 2018-04-11 23:08:13 +02:00
Jean Delvare a086bb8317 i2c: i801: Save register SMBSLVCMD value only once 
Saving the original value of register SMBSLVCMD in
i801_enable_host_notify() doesn't work, because this function is
called not only at probe time but also at resume time. Do it in
i801_probe() instead, so that the saved value is not overwritten at
resume time.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: 22e94bd677 ("i2c: i801: store and restore the SLVCMD register at load and unload")
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@vger.kernel.org	# v4.10+
 2018-04-11 23:07:14 +02:00
Linus Torvalds 0d5b1bd332 Merge branch 'i2c/for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 
Pull i2c updates from Wolfram Sang:

 -I2C core now reports proper OF style module alias. I'd like to repeat
  the note from the commit msg here (Thanks, Javier!):

      NOTE: This patch may break out-of-tree drivers that were relying
            on this behavior, and only had an I2C device ID table even
            when the device was registered via OF.

            There are no remaining drivers in mainline that do this, but
            out-of-tree drivers have to be fixed and define a proper OF
            device ID table to have module auto-loading working.

 - new driver for the SynQuacer I2C controller

 - major refactoring of the QUP driver

 - the piix4 driver now uses request_muxed_region which should fix a
   long standing resource conflict with the sp5100_tco watchdog

 - a bunch of small core & driver improvements

* 'i2c/for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (53 commits)
  i2c: add support for Socionext SynQuacer I2C controller
  dt-bindings: i2c: add binding for Socionext SynQuacer I2C
  i2c: Update i2c_trace_msg static key to modern api
  i2c: fix parameter of trace_i2c_result
  i2c: imx: avoid taking clk_prepare mutex in PM callbacks
  i2c: imx: use clk notifier for rate changes
  i2c: make i2c_check_addr_validity() static
  i2c: rcar: fix mask value of prohibited bit
  dt-bindings: i2c: document R8A77965 bindings
  i2c: pca-platform: drop gpio from platform data
  i2c: pca-platform: use device_property_read_u32
  i2c: pca-platform: unconditionally use devm_gpiod_get_optional
  sh: sh7785lcr: add GPIO lookup table for i2c controller reset
  i2c: qup: reorganization of driver code to remove polling for qup v2
  i2c: qup: reorganization of driver code to remove polling for qup v1
  i2c: qup: send NACK for last read sub transfers
  i2c: qup: fix buffer overflow for multiple msg of maximum xfer len
  i2c: qup: change completion timeout according to transfer length
  i2c: qup: use the complete transfer length to choose DMA mode
  i2c: qup: proper error handling for i2c error in BAM mode
  ...
 2018-04-07 12:36:18 -07:00
Ard Biesheuvel 0d676a6c43 i2c: add support for Socionext SynQuacer I2C controller 
This is a cleaned up version of the I2C controller driver for
the Fujitsu F_I2C IP, which was never supported upstream, and
has now been incorporated into the Socionext SynQuacer SoC.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[wsa: updated MAINTAINERS entry and removed two empty lines]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-04 20:33:03 +02:00
Davidlohr Bueso 50888b015d i2c: Update i2c_trace_msg static key to modern api 
No changes in refcount semantics -- key init is false; replace

static_key_slow_inc|dec   with   static_branch_inc|dec
static_key_false          with   static_branch_unlikely

Added a '_key' suffix to i2c_trace_msg, for better self
documentation.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-03 19:20:26 +02:00
Ahbong Chang 4a3f7691e2 i2c: fix parameter of trace_i2c_result 
According to the event i2c_result defined in include/trace/events/i2c.h,
the second parameter should be the number of messages instead of the
ended loop index. The value of ended loop index is the same as ret.

Signed-off-by: Ahbong Chang <cwahbong@google.com>
Reviewed-by: Todd Poynor <toddpoynor@google.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-03 16:37:45 +02:00
Lucas Stach d9a22d713a i2c: imx: avoid taking clk_prepare mutex in PM callbacks 
This is unsafe, as the runtime PM callbacks are called from the PM
workqueue, so this may deadlock when handling an i2c attached clock,
which may already hold the clk_prepare mutex from another context.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-03 15:29:28 +02:00
Lucas Stach 90ad2cbe88 i2c: imx: use clk notifier for rate changes 
Instead of repeatedly calling clk_get_rate for each transfer, register
a clock notifier to update the cached divider value each time the clock
rate actually changes.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-04-03 15:28:53 +02:00
Linus Torvalds f5a8eb632b arch: remove obsolete architecture ports 
This removes the entire architecture code for blackfin, cris, frv, m32r,
 metag, mn10300, score, and tile, including the associated device drivers.
 
 I have been working with the (former) maintainers for each one to ensure
 that my interpretation was right and the code is definitely unused in
 mainline kernels. Many had fond memories of working on the respective
 ports to start with and getting them included in upstream, but also saw
 no point in keeping the port alive without any users.
 
 In the end, it seems that while the eight architectures are extremely
 different, they all suffered the same fate: There was one company
 in charge of an SoC line, a CPU microarchitecture and a software
 ecosystem, which was more costly than licensing newer off-the-shelf
 CPU cores from a third party (typically ARM, MIPS, or RISC-V). It seems
 that all the SoC product lines are still around, but have not used the
 custom CPU architectures for several years at this point. In contrast,
 CPU instruction sets that remain popular and have actively maintained
 kernel ports tend to all be used across multiple licensees.
 
 The removal came out of a discussion that is now documented at
 https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
 marking any ports as deprecated but remove them all at once after I made
 sure that they are all unused. Some architectures (notably tile, mn10300,
 and blackfin) are still being shipped in products with old kernels,
 but those products will never be updated to newer kernel releases.
 
 After this series, we still have a few architectures without mainline
 gcc support:
 
 - unicore32 and hexagon both have very outdated gcc releases, but the
   maintainers promised to work on providing something newer. At least
   in case of hexagon, this will only be llvm, not gcc.
 
 - openrisc, risc-v and nds32 are still in the process of finishing their
   support or getting it added to mainline gcc in the first place.
   They all have patched gcc-7.3 ports that work to some degree, but
   complete upstream support won't happen before gcc-8.1. Csky posted
   their first kernel patch set last week, their situation will be similar.
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Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...
 2018-04-02 20:20:12 -07:00
Arnd Bergmann e58af24ccd i2c: remove bfin-twi driver 
The blackfin architecture is getting removed, so the
twi driver can also be removed.

Acked-by: Aaron Wu <aaron.wu@analog.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
 2018-03-26 15:57:07 +02:00
Wolfram Sang 398432edde i2c: make i2c_check_addr_validity() static 
After previous refactoring, there is only one user in the same file
left. Make the function static now.

[wsa: added 'int' to bare 'unsigned']
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 14:07:23 +01:00
Hiromitsu Yamasaki a1de3253a8 i2c: rcar: fix mask value of prohibited bit 
According to documentation, Bit 7 of ICMSR is unused and 0 should be
written to it. Fix the mask accordingly.

Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
[wsa: edited commit message]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 14:04:38 +01:00
Wolfram Sang 0b884c22c5 - three new special cases for device tree compatible strings 
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Merge tag 'at24-4.17-updates-for-wolfram' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-4.17

"three new special cases for device tree compatible strings"
 2018-03-24 13:39:18 +01:00
Pierre-Yves MORDRET 771b7bf053 i2c: i2c-stm32f7: fix no check on returned setup 
Before assigning returned setup structure check if not null

Fixes: 463a9215f3 ("i2c: stm32f7: fix setup structure")
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-03-24 13:37:41 +01:00
Chris Packham 7562dee282 i2c: pca-platform: use device_property_read_u32 
Use device_property_read_u32 instead of of_property_read_u32_index to
lookup the "clock-frequency" property.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:26:04 +01:00
Chris Packham 0678326175 i2c: pca-platform: unconditionally use devm_gpiod_get_optional 
Allow for the reset-gpios property to be defined in the device tree
or via a GPIO lookup table.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:26:00 +01:00
Abhishek Sahu 7545c7dba1 i2c: qup: reorganization of driver code to remove polling for qup v2 
Following are the major issues in current driver code

1. The current driver simply assumes the transfer completion
   whenever its gets any non-error interrupts and then simply do the
   polling of available/free bytes in FIFO.
2. The block mode is not working properly since no handling in
   being done for OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_READ.
3. An i2c transfer can contain multiple message and QUP v2
   supports reconfiguration during run in which the mode should be same
   for all the sub transfer. Currently the mode is being programmed
   before every sub transfer which is functionally wrong. If one message
   is less than FIFO length and other message is greater than FIFO
   length, then transfers will fail.

Because of above, i2c v2 transfers of size greater than 64 are failing
with following error message

	i2c_qup 78b6000.i2c: timeout for fifo out full

To make block mode working properly and move to use the interrupts
instead of polling, major code reorganization is required. Following
are the major changes done in this patch

1. Remove the polling of TX FIFO free space and RX FIFO available
   bytes and move to interrupts completely. QUP has QUP_MX_OUTPUT_DONE,
   QUP_MX_INPUT_DONE, OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_REQ
   interrupts to handle FIFO’s properly so check all these interrupts.
2. Determine the mode for transfer before starting by checking
   all the tx/rx data length in each message. The complete message can be
   transferred either in DMA mode or Programmed IO by FIFO/Block mode.
   in DMA mode, both tx and rx uses same mode but in PIO mode, the TX and
   RX can be in different mode.
3. During write, For FIFO mode, TX FIFO can be directly written
   without checking for FIFO space. For block mode, the QUP will generate
   OUT_BLOCK_WRITE_REQ interrupt whenever it has block size of available
   space.
4. During read, both TX and RX FIFO will be used. TX will be used
   for writing tags and RX will be used for receiving the data. In QUP,
   TX and RX can operate in separate mode so configure modes accordingly.
5. For read FIFO mode, wait for QUP_MX_INPUT_DONE interrupt which
   will be generated after all the bytes have been copied in RX FIFO. For
   read Block mode, QUP will generate IN_BLOCK_READ_REQ interrupts
   whenever it has block size of available data.
6. Split the transfer in chunk of one QUP block size(256 bytes)
   and schedule each block separately. QUP v2 supports reconfiguration
   during run in which QUP can transfer multiple blocks without issuing a
   stop events.
7. Port the SMBus block read support for new code changes.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:21:02 +01:00
Abhishek Sahu fbfab1ab06 i2c: qup: reorganization of driver code to remove polling for qup v1 
Following are the major issues in current driver code

1. The current driver simply assumes the transfer completion
   whenever its gets any non-error interrupts and then simply do the
   polling of available/free bytes in FIFO.
2. The block mode is not working properly since no handling in
   being done for OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_REQ.

Because of above, i2c v1 transfers of size greater than 32 are failing
with following error message

	i2c_qup 78b6000.i2c: timeout for fifo out full

To make block mode working properly and move to use the interrupts
instead of polling, major code reorganization is required. Following
are the major changes done in this patch

1. Remove the polling of TX FIFO free space and RX FIFO available
   bytes and move to interrupts completely. QUP has QUP_MX_OUTPUT_DONE,
   QUP_MX_INPUT_DONE, OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_REQ
   interrupts to handle FIFO’s properly so check all these interrupts.
2. During write, For FIFO mode, TX FIFO can be directly written
   without checking for FIFO space. For block mode, the QUP will generate
   OUT_BLOCK_WRITE_REQ interrupt whenever it has block size of available
   space.
3. During read, both TX and RX FIFO will be used. TX will be used
   for writing tags and RX will be used for receiving the data. In QUP,
   TX and RX can operate in separate mode so configure modes accordingly.
4. For read FIFO mode, wait for QUP_MX_INPUT_DONE interrupt which
   will be generated after all the bytes have been copied in RX FIFO. For
   read Block mode, QUP will generate IN_BLOCK_READ_REQ interrupts
   whenever it has block size of available data.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:20:51 +01:00
Abhishek Sahu f7714b4e45 i2c: qup: send NACK for last read sub transfers 
According to I2c specification, “If a master-receiver sends a
repeated START condition, it sends a not-acknowledge (A) just
before the repeated START condition”. QUP v2 supports sending
of NACK without stop with QUP_TAG_V2_DATARD_NACK so added the
same.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:20:41 +01:00
Abhishek Sahu 6f2f0f6465 i2c: qup: fix buffer overflow for multiple msg of maximum xfer len 
The BAM mode requires buffer for start tag data and tx, rx SG
list. Currently, this is being taken for maximum transfer length
(65K). But an I2C transfer can have multiple messages and each
message can be of this maximum length so the buffer overflow will
happen in this case. Since increasing buffer length won’t be
feasible since an I2C transfer can contain any number of messages
so this patch does following changes to make i2c transfers working
for multiple messages case.

1. Calculate the required buffers for 2 maximum length messages
   (65K * 2).
2. Split the descriptor formation and descriptor scheduling.
   The idea is to fit as many messages in one DMA transfers for 65K
   threshold value (max_xfer_sg_len). Whenever the sg_cnt is
   crossing this, then schedule the BAM transfer and subsequent
   transfer will again start from zero.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:20:30 +01:00
Abhishek Sahu ecb6e1e5f4 i2c: qup: change completion timeout according to transfer length 
Currently the completion timeout is being taken according to
maximum transfer length which is too high if SCL is operating in
high frequency. This patch calculates timeout on the basis of
one-byte transfer time and uses the same for completion timeout.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:20:20 +01:00
Abhishek Sahu 08f15963bc i2c: qup: use the complete transfer length to choose DMA mode 
Currently each message length in complete transfer is being
checked for determining DMA mode and if any of the message length
is less than FIFO length then non DMA mode is being used which
will increase overhead. DMA can be used for any length and it
should be determined with complete transfer length. Now, this
patch selects DMA mode if the total length is greater than FIFO
length.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:20:09 +01:00
Abhishek Sahu 3f450d3eea i2c: qup: proper error handling for i2c error in BAM mode 
Currently the i2c error handling in BAM mode is not working
properly in stress condition.

1. After an error, the FIFO are being written with FLUSH and
   EOT tags which should not be required since already these tags
   have been written in BAM descriptor itself.

2. QUP state is being moved to RESET in IRQ handler in case
   of error. When QUP HW encounters an error in BAM mode then it
   moves the QUP STATE to PAUSE state. In this case, I2C_FLUSH
   command needs to be executed while moving to RUN_STATE by writing
   to the QUP_STATE register with the I2C_FLUSH bit set to 1.

3. In Error case, sometimes, QUP generates more than one
   interrupt which will trigger the complete again. After an error,
   the flush operation will be scheduled after doing
   reinit_completion which should be triggered by BAM IRQ callback.
   If the second QUP IRQ comes during this time then it will call
   the complete and the transfer function will assume the all the
   BAM HW descriptors have been completed.

4. The release DMA is being called after each error which
   will free the DMA tx and rx channels. The error like NACK is very
   common in I2C transfer and every time this will be overhead. Now,
   since the error handling is proper so this release channel can be
   completely avoided.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:59 +01:00
Abhishek Sahu 7e6c35fe60 i2c: qup: fix the transfer length for BAM RX EOT FLUSH tags 
In case of FLUSH operation, BAM copies INPUT EOT FLUSH (0x94)
instead of normal EOT (0x93) tag in input data stream when an
input EOT tag is received during flush operation. So only one tag
will be written instead of 2 separate tags.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:48 +01:00
Abhishek Sahu c5adc0fa63 i2c: qup: schedule EOT and FLUSH tags at the end of transfer 
The role of FLUSH and EOT tag is to flush already scheduled
descriptors in BAM HW in case of error. EOT is required only
when descriptors are scheduled in RX FIFO. If all the messages
are WRITE, then only FLUSH tag will be used.

A single BAM transfer can have multiple read and write messages.
The EOT and FLUSH tags should be scheduled at the end of BAM HW
descriptors. Since the READ and WRITE can be present in any order
so for some of the cases, these tags are not being written
correctly.

Following is one of the example

   READ, READ, READ, READ

Currently EOT and FLUSH tags are being written after each READ.
If QUP gets NACK for first READ itself, then flush will be
triggered. It will look for first FLUSH tag in TX FIFO and will
stop there so only descriptors for first READ descriptors be
flushed. All the scheduled descriptors should be cleared to
generate BAM DMA completion.

Now this patch is scheduling FLUSH and EOT only once after all the
descriptors. So, flush will clear all the scheduled descriptors and
BAM will generate the completion interrupt.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:38 +01:00
Abhishek Sahu 6d5f37f166 i2c: qup: remove redundant variables for BAM SG count 
The rx_nents and tx_nents are redundant. rx_buf and tx_buf can
be used for total number of SG entries. Since rx_buf and tx_buf
give the impression that it is buffer instead of count so rename
it to tx_cnt and rx_cnt for giving it more meaningful variable
name.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:28 +01:00
Abhishek Sahu eb422b539c i2c: qup: minor code reorganization for use_dma 
1. Assigns use_dma in qup_dev structure itself which will
   help in subsequent patches to determine the mode in IRQ handler.
2. Does minor code reorganization for loops to reduce the
   unnecessary comparison and assignment.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:17 +01:00
Abhishek Sahu 7239872fb3 i2c: qup: fixed releasing dma without flush operation completion 
The QUP BSLP BAM generates the following error sometimes if the
current I2C DMA transfer fails and the flush operation has been
scheduled

    “bam-dma-engine 7884000.dma: Cannot free busy channel”

If any I2C error comes during BAM DMA transfer, then the QUP I2C
interrupt will be generated and the flush operation will be
carried out to make I2C consume all scheduled DMA transfer.
Currently, the same completion structure is being used for BAM
transfer which has already completed without reinit. It will make
flush operation wait_for_completion_timeout completed immediately
and will proceed for freeing the DMA resources where the
descriptors are still in process.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Acked-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Austin Christ <austinwc@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:19:07 +01:00
Abhishek Sahu 0668bc44a4 i2c: qup: fix copyrights and update to SPDX identifier 
The file has been updated from 2016 to 2018 so fixed the
copyright years.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-24 13:18:56 +01:00
George Cherian e349d7d08e i2c: xlp9xx: Handle NACK on DATA properly 
In case we receive NACK on DATA we shouldn't be resetting the controller,
rather we should issue STOP command. This will terminate the current
transaction and -EIO is returned.

While at that handle the SMBus Quick Command properly.
We shouldn't be setting the XLP9XX_I2C_CMD_READ/WRITE for such
transactions.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-17 21:57:44 +01:00
George Cherian d3898a7852 i2c: xlp9xx: Check for Bus state before every transfer 
I2C bus enters the STOP condition after the DATA_DONE interrupt is raised.
Essentially the driver should be checking the bus state before sending
any transaction. In case a transaction is initiated while the
bus is busy, the prior transaction's stop condition is not achieved.
Add the check to make sure the bus is not busy before every transaction.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-17 21:56:35 +01:00
Alexander Monakov 7a20e707aa i2c: designware: suppress unneeded SDA hold time warnings 
The hardware may not support SDA hold time configuration, but if it is
not set in the Device Tree either, there is no need to print a warning.

Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-17 21:53:01 +01:00
Gregory CLEMENT 31184d8c6e i2c: mv64xxx: Apply errata delay only in standard mode 
The errata FE-8471889 description has been updated. There is still a
timing violation for repeated start. But the errata now states that it
was only the case for the Standard mode (100 kHz), in Fast mode (400 kHz)
there is no issue.

This patch limit the errata fix to the Standard mode.

It has been tesed successfully on the clearfog (Aramda 388 based board).

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-17 21:20:04 +01:00
Moritz Fischer 74d23319fd i2c: xiic: Make suspend function names consistent 
Suspend functions seem to have been copied from i2c-cadence driver.
Rename the functions to match the rest of the driver.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-17 21:15:12 +01:00
Wolfram Sang 8efb11adee Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-4.17 
"These patches verify the device id of the PCA984x mux chips using
standardized (but rarely implemented) i2c device identification."
 2018-03-17 21:11:23 +01:00
Arnd Bergmann b67aea2bba Remove metag architecture 
These patches remove the metag architecture and tightly dependent
 drivers from the kernel. With the 4.16 kernel the ancient gcc 4.2.4
 based metag toolchain we have been using is hitting compiler bugs, so
 now seems a good time to drop it altogether.
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Merge tag 'metag_remove_2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jhogan/metag into asm-generic

Remove metag architecture

These patches remove the metag architecture and tightly dependent
drivers from the kernel. With the 4.16 kernel the ancient gcc 4.2.4
based metag toolchain we have been using is hitting compiler bugs, so
now seems a good time to drop it altogether.

* tag 'metag_remove_2' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
  i2c: img-scb: Drop METAG dependency
  media: img-ir: Drop METAG dependency
  watchdog: imgpdc: Drop METAG dependency
  MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE
  tty: Remove metag DA TTY and console driver
  clocksource: Remove metag generic timer driver
  irqchip: Remove metag irqchip drivers
  Drop a bunch of metag references
  docs: Remove remaining references to metag
  docs: Remove metag docs
  metag: Remove arch/metag/

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
 2018-03-07 22:18:39 +01:00
Peter Rosin 2d74187d5b i2c: mux: pca954x: verify the device id of the pca984x chips 
Make sure to not disallow the chips on adapters that are not capable
of reading the device id, but also make sure to check the device id
before writing to the chip.

Tested-by: Adrian Fiergolski <adrian.fiergolski@cern.ch>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-03-06 10:57:59 +01:00
Peter Rosin dde67eb1be i2c: add i2c_get_device_id() to get the standard i2c device id 
Can be used during probe to double check that the probed device is
what is expected.

Loosely based on code from Adrian Fiergolski <adrian.fiergolski@cern.ch>.

Tested-by: Adrian Fiergolski <adrian.fiergolski@cern.ch>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
 2018-03-06 10:57:59 +01:00
James Hogan 8d06c33026
i2c: img-scb: Drop METAG dependency 
Now that arch/metag/ has been removed, remove the METAG dependency from
the IMG SCB I2C device driver. The hardware is also present on MIPS SoCs
so the driver still has value.

Signed-off-by: James Hogan <jhogan@kernel.org>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c@vger.kernel.org
Cc: linux-metag@vger.kernel.org
 2018-03-05 16:34:26 +00:00
Javier Martinez Canillas af503716ac i2c: core: report OF style module alias for devices registered via OF 
The buses should honor the firmware interface used to register the device,
but the I2C core reports a MODALIAS of the form i2c:<device> even for I2C
devices registered via OF.

This means that user-space will never get an OF stype uevent MODALIAS even
when the drivers modules contain aliases exported from both the I2C and OF
device ID tables. For example, an Atmel maXTouch Touchscreen registered by
a DT node with compatible "atmel,maxtouch" has the following module alias:

$ cat /sys/class/i2c-adapter/i2c-8/8-004b/modalias
i2c:maxtouch

So udev won't be able to auto-load a module for an OF-only device driver.
Many OF-only drivers duplicate the OF device ID table entries in an I2C ID
table only has a workaround for how the I2C core reports the module alias.

This patch changes the I2C core to report an OF related MODALIAS uevent if
the device was registered via OF. So for the previous example, after this
patch, the reported MODALIAS for the Atmel maXTouch will be the following:

$ cat /sys/class/i2c-adapter/i2c-8/8-004b/modalias
of:NtrackpadT<NULL>Catmel,maxtouch

NOTE: This patch may break out-of-tree drivers that were relying on this
      behavior, and only had an I2C device ID table even when the device
      was registered via OF. There are no remaining drivers in mainline
      that do this, but out-of-tree drivers have to be fixed and define
      a proper OF device ID table to have module auto-loading working.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Dmitry Mastykin <mastichi@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-05 16:25:32 +01:00
Jean Delvare e9d09d97af i2c: scmi: Use standard device message logging functions 
ACPI_ERROR and ACPI_DEBUG_PRINT are not intended to be used by device
drivers. Use acpi_handle message logging functions instead.

As a nice side effect, it removes the following compiler warnings
which were printed when ACPI debug is disabled:

drivers/i2c/busses/i2c-scmi.c: In function "acpi_smbus_cmi_add_cap":
drivers/i2c/busses/i2c-scmi.c:328:39: warning: suggest braces around empty body in an "else" statement [-Wempty-body]
drivers/i2c/busses/i2c-scmi.c:338:12: warning: suggest braces around empty body in an "else" statement [-Wempty-body]

Suggested-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-02 11:18:55 +01:00
Guenter Roeck 04b6fcaba3 i2c: piix4: Use request_muxed_region 
Accesses to SB800_PIIX4_SMB_IDX can occur from multiple drivers.
One example for another driver is the sp5100_tco driver.

Use request_muxed_region() to ensure synchronization.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-02 11:17:23 +01:00
Guenter Roeck 0e89b2fec7 i2c: piix4: Use usleep_range() 
The piix4 i2c driver is extremely slow. Replacing msleep()
with usleep_range() increases its speed substantially.
Use sleep ranges similar to those used in the i2c-801 driver
to keep things simple.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-02 11:16:52 +01:00
Jan Glauber 7c4246797b i2c: octeon: Prevent error message on bus error 
The error message:

[Fri Feb 16 13:42:13 2018] i2c-thunderx 0000:01:09.4: unhandled state: 0

is mis-leading as state 0 (bus error) is not an unknown state.

Return -EIO as before but avoid printing the message. Also rename
STAT_ERROR to STATE_BUS_ERROR.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-03-02 11:11:15 +01:00
Wolfram Sang be5b928038 i2c: reformat comments around i2c_smbus_xfer_emulated() 
Use Kernel coding style for better readability.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Peter Rosin <peda@axentia.se>
 2018-02-27 13:54:05 +01:00
Colin Ian King bead21687f i2c-stm32f4: remove redundant initialization of pointer reg 
The pointer reg is assigned a value that is never read, it is later
overwritten with a new value, hence the redundant initialization can
be removed.

Cleans up clang warning:
drivers/i2c/busses/i2c-stm32f4.c:352:16: warning: Value stored to 'reg'
during its initialization is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-27 13:51:05 +01:00
Andrzej Hajda 939c5a46e5 i2c: exynos5: rework HSI2C_MASTER_ST_LOSE state handling 
HSI2C_MASTER_ST_LOSE state is not documented properly, extensive tests
show that hardware is usually able to recover from this state without
interrupting the transfer. Moreover documentation says that
such state can be caused by slave clock stretching, and should not be
treated as an error during transaction. The only place it indicates
an error is just before starting transaction. In such case bus recovery
procedure should be performed - master should pulse SCL line nine times
and then send STOP condition, it can be repeated until SDA goes high.
The procedure can be performed using manual commands HSI2C_CMD_READ_DATA
and HSI2C_CMD_SEND_STOP.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-27 13:47:28 +01:00
George Cherian 41b1d4de96 i2c: xlp9xx: Handle transactions with I2C_M_RECV_LEN properly 
In case of transaction with I2C_M_RECV_LEN set, make sure the driver reads
the first byte and then updates the RX fifo with the expected length. Set
threshold to 1 byte so that driver gets an interrupt on receiving the first byte.
After which the transfer length is updated depending on the received length.
Also report SMBus block read functionality.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 21:16:11 +01:00
Dmitry Bazhenov c2a3b3cce8 i2c: xlp9xx: return ENXIO on slave address NACK 
Fix the driver violation of the common practice to return
ENXIO error on a slave address NACK.

Signed-off-by: Dmitry Bazhenov <dmitry.bazhenov@auriga.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 21:14:09 +01:00
Wolfram Sang a1671af286 i2c: of: simplify reading the "reg" property 
of_get_property() is a bit cumbersome to use. Replace it with the newer
of_property_read_u32() for more readable code.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 20:40:46 +01:00
Wolfram Sang 4f3ae38acb i2c: of: remove duplicated check for valid address 
The very same check is done when calling i2c_new_device(). Remove it
here to avoid code duplication.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 20:40:46 +01:00
Wolfram Sang c49b0e0775 i2c: of: rename variable to meet expectations 
'result' is mostly used in the kernel as int for functions returning
errno on failure. Here it is a pointer to the client struct, so let's
call it this way (as the parent function does, too).

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 20:40:46 +01:00
Wolfram Sang e6db2d3278 i2c: of: make ref counting more visible 
When debugging a ref counting problem, I overlooked this snipplet a few
times. Might be taste, but I think the new location is visually easier
recognizable.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 20:40:46 +01:00
Wolfram Sang f1c87ceb02 i2c: of: change log level of failed device creation 
If we cannot create a device, this is an error, not a warning. Fix the
log level.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-26 20:40:46 +01:00
Andy Shevchenko d1fa74520d i2c: designware: Consider SCL GPIO optional 
GPIO library can return -ENOSYS for the failed request.
Instead of failing ->probe() in this case override error code to 0.

Fixes: ca382f5b38 ("i2c: designware: add i2c gpio recovery option")
Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-22 12:15:35 +01:00
Patryk Kocielnik c396b9a03e i2c: busses: i2c-sirf: Fix spelling: "formular" -> "formula". 
Fix spelling.

Signed-off-by: Patryk Kocielnik <patryk.kocielnik@gmail.com>
[wsa: fixed "Initialization", too]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
 2018-02-22 12:12:35 +01:00
Eric Anholt fe32a815f0 i2c: bcm2835: Set up the rising/falling edge delays 
We were leaving them in the power on state (or the state the firmware
had set up for some client, if we were taking over from them).  The
boot state was 30 core clocks, when we actually want to sample some
time after (to make sure that the new input bit has actually arrived).

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
 2018-02-22 12:11:07 +01:00