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

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>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index f6cb502c303f3e76fac70c1f797525e78e940a48..25f064c010384664c9c157382ddb518cd7d6af4a 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -138,13 +138,6 @@ 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;