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drm/dp_mst: Add MST support to DP DPCD R/W functions

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Instead of having drm_dp_dpcd_read/write and
drm_dp_mst_dpcd_read/write as entry points into the
aux code, have drm_dp_dpcd_read/write handle both.

This means that DRM drivers can make MST DPCD read/writes.

v2: Fix spacing
v3: Dump dpcd access on MST read/writes
v4: Fix calling wrong function on DPCD write
v5: delete deprecated include of drmP.h

Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Francis 2019-06-19 14:46:15 -04:00 committed by Alex Deucher
parent a3c2b0ffc0
commit 2f221a5efe
2 changed files with 22 additions and 20 deletions
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12
drivers/gpu/drm/drm_dp_aux_dev.c
View file

@ -163,11 +163,7 @@ static ssize_t auxdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
break;
}
if (aux_dev->aux->is_remote)
res = drm_dp_mst_dpcd_read(aux_dev->aux, pos, buf,
todo);
else
res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);
res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);
if (res <= 0)
break;
@ -215,11 +211,7 @@ static ssize_t auxdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
break;
}
if (aux_dev->aux->is_remote)
res = drm_dp_mst_dpcd_write(aux_dev->aux, pos, buf,
todo);
else
res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);
res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);
if (res <= 0)
break;

30
drivers/gpu/drm/drm_dp_helper.c
View file

@ -32,6 +32,7 @@
#include <drm/drm_dp_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include <drm/drm_dp_mst_helper.h>
#include "drm_crtc_helper_internal.h"
@ -266,7 +267,7 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
/**
* drm_dp_dpcd_read() - read a series of bytes from the DPCD
* @aux: DisplayPort AUX channel
* @aux: DisplayPort AUX channel (SST or MST)
* @offset: address of the (first) register to read
* @buffer: buffer to store the register values
* @size: number of bytes in @buffer
@ -295,13 +296,18 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
* We just have to do it before any DPCD access and hope that the
* monitor doesn't power down exactly after the throw away read.
*/
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_DPCD_REV, buffer,
1);
if (ret != 1)
goto out;
if (!aux->is_remote) {
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_DPCD_REV,
buffer, 1);
if (ret != 1)
goto out;
}
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, buffer,
size);
if (aux->is_remote)
ret = drm_dp_mst_dpcd_read(aux, offset, buffer, size);
else
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset,
buffer, size);
out:
drm_dp_dump_access(aux, DP_AUX_NATIVE_READ, offset, buffer, ret);
@ -311,7 +317,7 @@ EXPORT_SYMBOL(drm_dp_dpcd_read);
/**
* drm_dp_dpcd_write() - write a series of bytes to the DPCD
* @aux: DisplayPort AUX channel
* @aux: DisplayPort AUX channel (SST or MST)
* @offset: address of the (first) register to write
* @buffer: buffer containing the values to write
* @size: number of bytes in @buffer
@ -328,8 +334,12 @@ ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,
{
int ret;
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer,
size);
if (aux->is_remote)
ret = drm_dp_mst_dpcd_write(aux, offset, buffer, size);
else
ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset,
buffer, size);
drm_dp_dump_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer, ret);
return ret;
}