drm/amd/display: Blocking invalid 420 modes on HDMI TMDS for DCN31

[ Upstream commit 026a71babf48efb6b9884a3a66fa31aec9e1ea54 ]

[Why & How]
HDMI TMDS does not have ODM support. Filtering 420 modes that
exceed the 4096 FMT limitation on DCN31 will resolve
intermittent corruptions issues.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Leo Chen <sancchen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
index ebc04b7..9c84561 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
@@ -4133,7 +4133,9 @@ void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
                                }
                                if (v->OutputFormat[k] == dm_420 && v->HActive[k] > DCN31_MAX_FMT_420_BUFFER_WIDTH
                                                && v->ODMCombineEnablePerState[i][k] != dm_odm_combine_mode_4to1) {
-                                       if (v->HActive[k] / 2 > DCN31_MAX_FMT_420_BUFFER_WIDTH) {
+                                       if (v->Output[k] == dm_hdmi) {
+                                               FMTBufferExceeded = true;
+                                       } else if (v->HActive[k] / 2 > DCN31_MAX_FMT_420_BUFFER_WIDTH) {
                                                v->ODMCombineEnablePerState[i][k] = dm_odm_combine_mode_4to1;
                                                v->PlaneRequiredDISPCLK = v->PlaneRequiredDISPCLKWithODMCombine4To1;