From: Eric Yang <Eric.Yang2@amd.com>
Date: Fri, 14 Sep 2018 17:53:14 +0000 (-0400)
Subject: drm/amd/display: block DP YCbCr420 modes
X-Git-Tag: v4.20-rc1~81^2~3^2~64
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b7cd6487a52484bed5ba5424177f7a90166bcaac;p=linux.git

drm/amd/display: block DP YCbCr420 modes

[why]
Currently not supported, will black screen when set.

[How]
Fail validate timing helper for those modes.

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
index 4942590e8b9c..70eb9472ccd9 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -662,6 +662,9 @@ bool dce110_link_encoder_validate_dp_output(
 	const struct dce110_link_encoder *enc110,
 	const struct dc_crtc_timing *crtc_timing)
 {
+	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
+		return false;
+
 	/* default RGB only */
 	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB)
 		return true;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
index 6f675206a136..bef0011a98b0 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
@@ -606,6 +606,9 @@ bool dcn10_link_encoder_validate_dp_output(
 	const struct dcn10_link_encoder *enc10,
 	const struct dc_crtc_timing *crtc_timing)
 {
+	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
+		return false;
+
 	/* default RGB only */
 	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB)
 		return true;