[PATCH 32/32] drm/amd/display: Fix dim display on DCE11

Deucher, Alexander Alexander.Deucher at amd.com
Wed Apr 4 15:17:40 UTC 2018

Do other DCE blocks need this fix as well?  Or is this code shared with say DCE8 and DCE10?


From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Harry Wentland <harry.wentland at amd.com>
Sent: Tuesday, April 3, 2018 9:27 PM
To: amd-gfx at lists.freedesktop.org
Cc: Li, Sun peng (Leo)
Subject: [PATCH 32/32] drm/amd/display: Fix dim display on DCE11

From: "Leo (Sunpeng) Li" <sunpeng.li at amd.com>

Before programming the input gamma, check that we're not using the
identity correction.

Signed-off-by: Leo (Sunpeng) Li <sunpeng.li at amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 99d192200797..f385b18d5c2e 100644
--- 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 pipe_ctx *pipe_ctx,
         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) {

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