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drm/amd/display: Don't program bypass on linear regamma LUT

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Even though this is required for degamma since DCE HW only supports a
couple predefined LUTs we can just program the LUT directly for regamma.

This fixes dark screens which occurs when we program regamma to bypass
while degamma is using srgb LUT.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harry Wentland 2018-04-12 16:37:09 -04:00 committed by Alex Deucher
parent 2c773de2ec
commit c2f84e03a0
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
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@ -139,13 +139,6 @@ int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
lut = (struct drm_color_lut *)blob->data;
lut_size = blob->length / sizeof(struct drm_color_lut);
if (__is_lut_linear(lut, lut_size)) {
/* Set to bypass if lut is set to linear */
stream->out_transfer_func->type = TF_TYPE_BYPASS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
return 0;
}
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;