Commit 05e62b6b authored by George Shen's avatar George Shen Committed by Alex Deucher
Browse files

drm/amd/display: Filter out YCbCr420 timing if VSC SDP not supported 



[Why]
Per DP specification, YCbCr420 shall use VSC SDP.

[How]
For YCbCr420 timings, fail DP mode timing validation
if DPCD caps do not indicate VSC SDP colorimetry
support.

Signed-off-by: default avatarGeorge Shen <george.shen@amd.com>
Reviewed-by: default avatarWenjing Liu <Wenjing.Liu@amd.com>
Acked-by: default avatarWayne Lin <Wayne.Lin@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 70c14a1d

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

+6 −0
Original line number Diff line number Diff line
@@ -2411,6 +2411,12 @@ bool dp_validate_mode_timing( 


	const struct dc_link_settings *link_setting;



	/* According to spec, VSC SDP should be used if pixel format is YCbCr420 */

	if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 &&

			!link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED &&

			dal_graphics_object_id_get_connector_id(link->link_id) != CONNECTOR_ID_VIRTUAL)

		return false;



	/*always DP fail safe mode*/

	if ((timing->pix_clk_100hz / 10) == (uint32_t) 25175 &&

		timing->h_addressable == (uint32_t) 640 &&