4.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Leo (Sunpeng) Li" <sunpeng.li@xxxxxxx>
[ Upstream commit 84ffa80123f56f80145dc638f21dfcbedda5610d ]
Before programming the input gamma, check that we're not using the
identity correction.
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@xxxxxxx>
Reviewed-by: Anthony Koo <Anthony.Koo@xxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -279,7 +279,9 @@ dce110_set_input_transfer_func(struct pi
build_prescale_params(&prescale_params, plane_state);
ipp->funcs->ipp_program_prescale(ipp, &prescale_params);
- if (plane_state->gamma_correction && dce_use_lut(plane_state->format))
+ if (plane_state->gamma_correction &&
+ !plane_state->gamma_correction->is_identity &&
+ dce_use_lut(plane_state->format))
ipp->funcs->ipp_program_input_lut(ipp, plane_state->gamma_correction);
if (tf == NULL) {
