diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2066-drm-amd-display-Update-link-rate-from-DPCD-10.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2066-drm-amd-display-Update-link-rate-from-DPCD-10.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2066-drm-amd-display-Update-link-rate-from-DPCD-10.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2066-drm-amd-display-Update-link-rate-from-DPCD-10.patch new file mode 100644 index 00000000..4039b422 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2066-drm-amd-display-Update-link-rate-from-DPCD-10.patch @@ -0,0 +1,60 @@ +From 16930318f55f8a9b1a766d54a6a087a21c00a6dd Mon Sep 17 00:00:00 2001 +From: Wesley Chalmers <Wesley.Chalmers@amd.com> +Date: Thu, 16 May 2019 12:40:25 -0400 +Subject: [PATCH 2066/2940] drm/amd/display: Update link rate from DPCD 10 + +[WHY] +Some panels return a link rate of 0 (unknown) in DPCD 0. In this case, +an appropriate mode cannot be set, and certain panels will show +corruption as they are forced to use a mode they do not support. + +[HOW] +Read DPCD 10 in the case where supported link rate from DPCD 0 is +unknown, and pass that value on to the reported link rate. +This re-introduces behaviour present in previous versions that appears +to have been accidentally removed. + +Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> +Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> +Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 9 ++++++--- + 1 file changed, 6 insertions(+), 3 deletions(-) + +diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +index 65d6caedbd82..2d519e5fc3ea 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +@@ -1624,8 +1624,7 @@ static bool decide_edp_link_settings(struct dc_link *link, struct dc_link_settin + uint32_t link_bw; + + if (link->dpcd_caps.dpcd_rev.raw < DPCD_REV_14 || +- link->dpcd_caps.edp_supported_link_rates_count == 0 || +- link->dc->config.optimize_edp_link_rate == false) { ++ link->dpcd_caps.edp_supported_link_rates_count == 0) { + *link_setting = link->verified_link_cap; + return true; + } +@@ -2609,7 +2608,8 @@ void detect_edp_sink_caps(struct dc_link *link) + memset(supported_link_rates, 0, sizeof(supported_link_rates)); + + if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 && +- link->dc->config.optimize_edp_link_rate) { ++ (link->dc->config.optimize_edp_link_rate || ++ link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN)) { + // Read DPCD 00010h - 0001Fh 16 bytes at one shot + core_link_read_dpcd(link, DP_SUPPORTED_LINK_RATES, + supported_link_rates, sizeof(supported_link_rates)); +@@ -2624,6 +2624,9 @@ void detect_edp_sink_caps(struct dc_link *link) + link_rate = linkRateInKHzToLinkRateMultiplier(link_rate_in_khz); + link->dpcd_caps.edp_supported_link_rates[link->dpcd_caps.edp_supported_link_rates_count] = link_rate; + link->dpcd_caps.edp_supported_link_rates_count++; ++ ++ if (link->reported_link_cap.link_rate < link_rate) ++ link->reported_link_cap.link_rate = link_rate; + } + } + } +-- +2.17.1 + |