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

[Leo Li]

On 2018-04-16 03:39 PM, Harry Wentland wrote:
> 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 at amd.com>

Thanks Harry,

Reviewed-by: Leo Li <sunpeng.li at amd.com>

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c | 7 -------
>   1 file changed, 7 deletions(-)
> 
> 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 ef5fad8c5aac..e3d90e918d1b 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> @@ -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;
>