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drm/amd/display: Correct DPCD revision for eDP v1.4 

[Why]
eDP version and DPCD revision are different. Per VESA
spec, "The DPCD revision for eDP v1.4 is 13h".

SUPPORTED_LINK_RATES is valid since eDP v1.4 (DPCD_REV_13).

[How]
Correct DPCD_REV for eDP v1.4.

Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Nikola Cornij <Nikola.Cornij@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Zhan Liu 2021-05-05 17:44:46 -04:00 committed by Alex Deucher
parent 3bb68cec4d
commit 67c268a50a
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -2577,7 +2577,11 @@ bool decide_edp_link_settings(struct dc_link *link, struct dc_link_settings *lin
struct dc_link_settings current_link_setting;
uint32_t link_bw;
if (link->dpcd_caps.dpcd_rev.raw < DPCD_REV_14 ||
/*
* edp_supported_link_rates_count is only valid for eDP v1.4 or higher.
* Per VESA eDP spec, "The DPCD revision for eDP v1.4 is 13h"
*/
if (link->dpcd_caps.dpcd_rev.raw < DPCD_REV_13 ||
link->dpcd_caps.edp_supported_link_rates_count == 0) {
*link_setting = link->verified_link_cap;
return true;
@ -4000,7 +4004,11 @@ void detect_edp_sink_caps(struct dc_link *link)
link->dpcd_caps.edp_supported_link_rates_count = 0;
memset(supported_link_rates, 0, sizeof(supported_link_rates));
if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 &&
/*
* edp_supported_link_rates_count is only valid for eDP v1.4 or higher.
* Per VESA eDP spec, "The DPCD revision for eDP v1.4 is 13h"
*/
if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_13 &&
(link->dc->debug.optimize_edp_link_rate ||
link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN)) {
// Read DPCD 00010h - 0001Fh 16 bytes at one shot