[PATCH] drm/amd/display: Program color range and encoding correctly for DCN2+

[Harry Wentland]

[Why]
DCN2 CNVC programming did not respect the input_color_space
and was therefore programming the wrong CSC matrix for YUV
to RGB conversion, leading to a wrong image. In particular
blacks for limited range videos would show as dark grey.

[How]
Do what DCN1 does and use the input_color_space info in
dpp_setup if it's available.

Signed-off-by: Harry Wentland <harry.wentland at amd.com>
Cc: stable at vger.kernel.org
Cc: hersenxs.wu at amd.com
Cc: Ikshwaku.Chauhan at amd.com
Cc: Nicholas.Kazlauskas at amd.com
Cc: CHANDAN.VURDIGERENATARAJ at amd.com
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c   | 3 +++
 drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c | 3 +++
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c   | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c
index 970b65efeac1..eaa7032f0f1a 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.c
@@ -212,6 +212,9 @@ static void dpp2_cnv_setup (
 		break;
 	}
 
+	/* Set default color space based on format if none is given. */
+	color_space = input_color_space ? input_color_space : color_space;
+
 	if (is_2bit == 1 && alpha_2bit_lut != NULL) {
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT0, alpha_2bit_lut->lut0);
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT1, alpha_2bit_lut->lut1);
diff --git a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c
index 8b6505b7dca8..f50ab961bc17 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_dpp.c
@@ -153,6 +153,9 @@ static void dpp201_cnv_setup(
 		break;
 	}
 
+	/* Set default color space based on format if none is given. */
+	color_space = input_color_space ? input_color_space : color_space;
+
 	if (is_2bit == 1 && alpha_2bit_lut != NULL) {
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT0, alpha_2bit_lut->lut0);
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT1, alpha_2bit_lut->lut1);
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c
index ab3918c0a15b..0dcc07531643 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c
@@ -294,6 +294,9 @@ static void dpp3_cnv_setup (
 		break;
 	}
 
+	/* Set default color space based on format if none is given. */
+	color_space = input_color_space ? input_color_space : color_space;
+
 	if (is_2bit == 1 && alpha_2bit_lut != NULL) {
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT0, alpha_2bit_lut->lut0);
 		REG_UPDATE(ALPHA_2BIT_LUT, ALPHA_2BIT_LUT1, alpha_2bit_lut->lut1);
-- 
2.35.1