drm/amd/display: clean up encoding checks

[Why]
All ASICS we support has YCbCr support, so
the check is unnecessary, the currently logic
in validate output also returns true all
the time, so the unneccessary logic is removed
Signed-off-by: NEric Yang <Eric.Yang2@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Acked-by: NLeo Li <sunpeng.li@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c

@@ -665,21 +665,7 @@ bool dce110_link_encoder_validate_dp_output(
 	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
 		return false;
 
-	/* default RGB only */
-	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB)
-		return true;
-
-	if (enc110->base.features.flags.bits.IS_YCBCR_CAPABLE)
-		return true;
-
-	/* for DCE 8.x or later DP Y-only feature,
-	 * we need ASIC cap + FeatureSupportDPYonly, not support 666 */
-	if (crtc_timing->flags.Y_ONLY &&
-		enc110->base.features.flags.bits.IS_YCBCR_CAPABLE &&
-		crtc_timing->display_color_depth != COLOR_DEPTH_666)
-		return true;
-
-	return false;
+	return true;
 }
 
 void dce110_link_encoder_construct(

drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c

@@ -551,8 +551,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		.max_hdmi_deep_color = COLOR_DEPTH_121212,
 		.max_hdmi_pixel_clock = 300000,
 		.flags.bits.IS_HBR2_CAPABLE = true,
-		.flags.bits.IS_TPS3_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
+		.flags.bits.IS_TPS3_CAPABLE = true
 };
 
 struct link_encoder *dce100_link_encoder_create(

drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c

@@ -570,8 +570,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		.max_hdmi_deep_color = COLOR_DEPTH_121212,
 		.max_hdmi_pixel_clock = 594000,
 		.flags.bits.IS_HBR2_CAPABLE = true,
-		.flags.bits.IS_TPS3_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
+		.flags.bits.IS_TPS3_CAPABLE = true
 };
 
 static struct link_encoder *dce110_link_encoder_create(

drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c

@@ -555,8 +555,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		.flags.bits.IS_HBR2_CAPABLE = true,
 		.flags.bits.IS_HBR3_CAPABLE = true,
 		.flags.bits.IS_TPS3_CAPABLE = true,
-		.flags.bits.IS_TPS4_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
+		.flags.bits.IS_TPS4_CAPABLE = true
 };
 
 struct link_encoder *dce112_link_encoder_create(

drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c

@@ -609,7 +609,6 @@ static const struct encoder_feature_support link_enc_feature = {
 		.flags.bits.IS_HBR3_CAPABLE = true,
 		.flags.bits.IS_TPS3_CAPABLE = true,
 		.flags.bits.IS_TPS4_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
 };
 
 static struct link_encoder *dce120_link_encoder_create(

drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c

@@ -650,8 +650,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		.max_hdmi_deep_color = COLOR_DEPTH_121212,
 		.max_hdmi_pixel_clock = 297000,
 		.flags.bits.IS_HBR2_CAPABLE = true,
-		.flags.bits.IS_TPS3_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
+		.flags.bits.IS_TPS3_CAPABLE = true
 };
 
 struct link_encoder *dce80_link_encoder_create(

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c

@@ -609,22 +609,7 @@ bool dcn10_link_encoder_validate_dp_output(
 	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
 		return false;
 
-	/* default RGB only */
-	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB)
-		return true;
-
-	if (enc10->base.features.flags.bits.IS_YCBCR_CAPABLE)
-		return true;
-
-	/* for DCE 8.x or later DP Y-only feature,
-	 * we need ASIC cap + FeatureSupportDPYonly, not support 666
-	 */
-	if (crtc_timing->flags.Y_ONLY &&
-		enc10->base.features.flags.bits.IS_YCBCR_CAPABLE &&
-		crtc_timing->display_color_depth != COLOR_DEPTH_666)
-		return true;
-
-	return false;
+	return true;
 }
 
 void dcn10_link_encoder_construct(

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c

@@ -711,8 +711,7 @@ static const struct encoder_feature_support link_enc_feature = {
 		.flags.bits.IS_HBR2_CAPABLE = true,
 		.flags.bits.IS_HBR3_CAPABLE = true,
 		.flags.bits.IS_TPS3_CAPABLE = true,
-		.flags.bits.IS_TPS4_CAPABLE = true,
-		.flags.bits.IS_YCBCR_CAPABLE = true
+		.flags.bits.IS_TPS4_CAPABLE = true
 };
 
 struct link_encoder *dcn10_link_encoder_create(

drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h

@@ -58,7 +58,6 @@ struct encoder_feature_support {
 			uint32_t IS_HBR3_CAPABLE:1;
 			uint32_t IS_TPS3_CAPABLE:1;
 			uint32_t IS_TPS4_CAPABLE:1;
-			uint32_t IS_YCBCR_CAPABLE:1;
 			uint32_t HDMI_6GB_EN:1;
 		} bits;
 		uint32_t raw;