From: "Leo (Sunpeng) Li" <sunpeng.li@amd.com>
Date: Thu, 29 Mar 2018 17:04:12 -0400
Subject: drm/amd/display: Fix dim display on DCE11
Git-commit: 84ffa80123f56f80145dc638f21dfcbedda5610d
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Before programming the input gamma, check that we're not using the
identity correction.
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
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
@@ -280,7 +280,9 @@ 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) {