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drm/amd/display: read DP sink and DP branch hardware and firmware revision from DPCD

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- define new dpcd address in drm
- implement new members in dpcd_caps to store values read from new dpcd address

Signed-off-by: Alvin lee <alvin.lee3@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alvin lee
2018-06-19 15:40:09 -04:00
committed by Alex Deucher
parent e1cb3e4801
commit 4b99affbb3
3 changed files with 33 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/include/dpcd_defs.h
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@@ -27,6 +27,9 @@
#define __DAL_DPCD_DEFS_H__
#include <drm/drm_dp_helper.h>
#ifndef DP_SINK_HW_REVISION_START // can remove this once the define gets into linux drm_dp_helper.h
#define DP_SINK_HW_REVISION_START 0x409
#endif
enum dpcd_revision {
DPCD_REV_10 = 0x10,