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linux/arch/arm
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Jon Hunter 127500ccb7 ARM: OMAP2+: Only write the sysconfig on idle when necessary 
Currently, whenever we idle a device _idle_sysc() is called and writes to the
devices SYSCONFIG register to set the idle mode. A lot devices are using the
smart-idle mode and so the write to the SYSCONFIG register is programming the
same value that is already stored in the register.

Writes to the devices SYSCONFIG register can be slow, for example, writing to
the DMTIMER SYSCONFIG register takes 3 interface clock cycles and 3 functional
clock cycles. If the DMTIMER is using the slow 32kHz functional clock this can
take ~100us.

Furthermore, during boot on an OMAP4430 panda board, I see that there are 100
calls to _idle_sysc(), however, only 3 out of the 100 calls actually write
the SYSCONFIG register with a new value.

Therefore, to avoid unnecessary writes to device SYSCONFIG registers when
idling the device, only write the value if the value has changed. It should be
safe to do this on idle as the context of the register will never be lost while
the device is active.

Verified that suspend, CORE off and retention states are working with this
change on OMAP3430 Beagle board.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
[paul@pwsan.com: updated to apply]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
2013-08-23 04:40:23 -06:00
..
boot ARM: tegra: enable ULPI phy on Colibri T20 2013-08-04 13:52:10 -07:00
common Merge tag 'davinci-fixes-for-v3.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into fixes 2013-07-22 19:54:21 -07:00
configs ARM: multi_v7_defconfig: Select USB chipidea driver 2013-07-23 12:18:02 -07:00
crypto ARM: 7723/1: crypto: sha1-armv4-large.S: fix SP handling 2013-05-22 22:01:35 +01:00
include Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2013-08-16 16:52:29 -07:00
kernel perf/arm: Fix armpmu_map_hw_event() 2013-08-13 16:57:24 -07:00
kvm KVM fixes for 3.11 2013-07-03 13:21:40 -07:00
lib arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-at91 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-bcm ARM: bcm281xx: Remove init_irq declaration in machine description 2013-05-14 09:48:40 -07:00
mach-bcm2835 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-clps711x reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-cns3xxx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-davinci ARM: davinci: make file local variables static 2013-07-16 20:38:44 +05:30
mach-dove Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-ebsa110 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-ep93xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-exynos Samsung fixes for v3.11 2013-07-24 17:06:58 -07:00
mach-footbridge ARM: footbridge: fix overlapping PCI mappings 2013-07-22 20:00:47 -07:00
mach-gemini ARM: arm-soc cleanup for 3.10 2013-05-02 09:03:55 -07:00
mach-highbank ARM: highbank: Only touch common coherency control register fields 2013-07-22 20:03:59 -07:00
mach-imx The imx fixes for 3.11: 2013-07-22 19:58:02 -07:00
mach-integrator reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop13xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop32x reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-iop33x
mach-ixp4xx ARM: SoC fixes for 3.11-rc 2013-07-13 15:00:26 -07:00
mach-keystone ARM: keystone: fix compilation warning 2013-07-23 11:03:54 -07:00
mach-kirkwood Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-ks8695 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-lpc32xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-mmp reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-msm Fixes for MSM for 3.11 2013-08-04 13:34:57 -07:00
mach-mv78xx0 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-mvebu arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-mxs Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-07-09 18:24:39 -07:00
mach-netx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-nomadik reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-nspire arm: Add Initial TI-Nspire support 2013-06-21 20:06:30 +02:00
mach-omap1 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-omap2 ARM: OMAP2+: Only write the sysconfig on idle when necessary 2013-08-23 04:40:23 -06:00
mach-orion5x Watchdog: allow orion_wdt to be built for Dove 2013-07-11 22:17:56 +02:00
mach-picoxcell reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-prima2 arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-pxa ARM: pxa: propagate errors from regulator_enable() to pxamci 2013-07-23 12:15:15 -07:00
mach-realview reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-rockchip arm: add basic support for Rockchip RK3066a boards 2013-06-21 09:21:02 +02:00
mach-rpc reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s3c24xx Samsung fixes for v3.11 2013-07-24 17:06:58 -07:00
mach-s3c64xx reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5p64x0 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5pc100 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-s5pv210 For the 3.11 merge we only have one new MFD driver for the Kontron PLD. 2013-07-10 11:10:27 -07:00
mach-sa1100 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-shark reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-shmobile Second round of Renesas ARM based SoC fixes for v3.11 2013-08-04 13:37:49 -07:00
mach-socfpga arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-spear arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-sti ARM: STi: remove sti_secondary_start from INIT section. 2013-08-04 13:40:55 -07:00
mach-sunxi reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-tegra arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-u300 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-ux500 arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
mach-versatile reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-vexpress ARM SoC specific changes 2013-07-02 13:43:38 -07:00
mach-virt Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-07-03 09:46:29 -07:00
mach-vt8500 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-w90x900 reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
mach-zynq ARM: zynq: fix compilation warning 2013-07-23 11:04:04 -07:00
mm Merge branch 'security-fixes' into fixes 2013-08-01 20:51:13 +01:00
net arm: bpf_jit: can call module_free() from any context 2013-05-20 14:03:50 -07:00
nwfpe
oprofile
plat-iop reboot: arm: change reboot_mode to use enum reboot_mode 2013-07-09 10:33:29 -07:00
plat-omap Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
plat-orion Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
plat-pxa
plat-samsung ARM: SAMSUNG: Save/restore only selected uart's registers 2013-07-24 17:05:07 +09:00
plat-versatile arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
tools
vfp ARM: 7729/1: vfp: ensure VFP_arch is non-zero when VFP is not supported 2013-05-22 22:01:37 +01:00
xen xen/arm,arm64: update xen_restart after ff701306cd and 7b6d864b48 2013-07-23 12:22:47 +00:00
Kconfig Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2013-08-02 14:37:45 -07:00
Kconfig-nommu ARM: mpu: Ensure that MPU depends on CPU_V7 2013-06-17 15:13:18 +01:00
Kconfig.debug ARM: document DEBUG_UNCOMPRESS Kconfig option 2013-07-22 12:03:50 +01:00
Makefile ARM: Fix sorting of machine- initializers 2013-07-27 00:45:45 +01:00