Commit d9f442e9 authored by David Zhang's avatar David Zhang Committed by Alex Deucher
Browse files

drm/amd/display: read PSR-SU cap DPCD for specific panel 



[why & how]
For some specific eDP panel, we'd check the PSR-SU cap during boot
by reading the vendor specific DPCD, otherwise it will cause to
false report the eDP panel which supports PSR-SU as an non-PSR-SU
panel.

- add the vendor specific DPCD address in ddc_service_types header
- if specific eDP panel detected, check vendor specific DPCD for
  PSR-SU cap

Reviewed-by: default avatarAurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com>
Acked-by: default avatarTom Chung <chiahsuan.chung@amd.com>
Signed-off-by: default avatarDavid Zhang <dingchen.zhang@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4a0caac0

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+4 −0
Original line number Diff line number Diff line
@@ -5822,6 +5822,10 @@ void detect_edp_sink_caps(struct dc_link *link) 
		core_link_read_dpcd(link, DP_PSR_SUPPORT,

			&link->dpcd_caps.psr_info.psr_version,

			sizeof(link->dpcd_caps.psr_info.psr_version));

		if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8)

			core_link_read_dpcd(link, DP_FORCE_PSRSU_CAPABILITY,

						&link->dpcd_caps.psr_info.force_psrsu_cap,

						sizeof(link->dpcd_caps.psr_info.force_psrsu_cap));

		core_link_read_dpcd(link, DP_PSR_CAPS,

			&link->dpcd_caps.psr_info.psr_dpcd_caps.raw,

			sizeof(link->dpcd_caps.psr_info.psr_dpcd_caps.raw));

drivers/gpu/drm/amd/display/include/ddc_service_types.h

+2 −0
Original line number Diff line number Diff line
@@ -39,6 +39,8 @@ 
#define DP_BRANCH_HW_REV_20 0x20



#define DP_DEVICE_ID_38EC11 0x38EC11

#define DP_FORCE_PSRSU_CAPABILITY 0x40F



enum ddc_result {

	DDC_RESULT_UNKNOWN = 0,

	DDC_RESULT_SUCESSFULL,