[PATCH 4.19 021/205] drm/amd/display: fix gamma not being applied

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@xxxxxxx>

[ Upstream commit 30049754ab7c4b6148dd3cd64af7d54850604582 ]

[WHY]
Previously night light forced a full update by
applying a  transfer function update regardless of if it was changed.
This logic was removed,

Now gamma surface updates are only applied when there is also a plane
info update, this does not work in cases such as using the night light
slider.

[HOW]
When moving the night light slider we will perform a full update if
the gamma has changed and there is a surface, even when the surface
has not changed. Also get stream updates in setgamma prior to
update planes and stream.

Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@xxxxxxx>
Reviewed-by: Anthony Koo <Anthony.Koo@xxxxxxx>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1120,9 +1120,6 @@ static enum surface_update_type get_plan
 		 */
 		update_flags->bits.bpp_change = 1;
 
-	if (u->gamma && dce_use_lut(u->plane_info->format))
-		update_flags->bits.gamma_change = 1;
-
 	if (memcmp(&u->plane_info->tiling_info, &u->surface->tiling_info,
 			sizeof(union dc_tiling_info)) != 0) {
 		update_flags->bits.swizzle_change = 1;
@@ -1139,7 +1136,6 @@ static enum surface_update_type get_plan
 	if (update_flags->bits.rotation_change
 			|| update_flags->bits.stereo_format_change
 			|| update_flags->bits.pixel_format_change
-			|| update_flags->bits.gamma_change
 			|| update_flags->bits.bpp_change
 			|| update_flags->bits.bandwidth_change
 			|| update_flags->bits.output_tf_change)
@@ -1229,13 +1225,26 @@ static enum surface_update_type det_surf
 	if (u->coeff_reduction_factor)
 		update_flags->bits.coeff_reduction_change = 1;
 
+	if (u->gamma) {
+		enum surface_pixel_format format = SURFACE_PIXEL_FORMAT_GRPH_BEGIN;
+
+		if (u->plane_info)
+			format = u->plane_info->format;
+		else if (u->surface)
+			format = u->surface->format;
+
+		if (dce_use_lut(format))
+			update_flags->bits.gamma_change = 1;
+	}
+
 	if (update_flags->bits.in_transfer_func_change) {
 		type = UPDATE_TYPE_MED;
 		elevate_update_type(&overall_type, type);
 	}
 
 	if (update_flags->bits.input_csc_change
-			|| update_flags->bits.coeff_reduction_change) {
+			|| update_flags->bits.coeff_reduction_change
+			|| update_flags->bits.gamma_change) {
 		type = UPDATE_TYPE_FULL;
 		elevate_update_type(&overall_type, type);
 	}