4.17-stable review patch. If anyone has any objections, please let me know.
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From: "Leo (Sunpeng) Li" sunpeng.li@amd.com
[ 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@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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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) {