linux-kernel - Re: [PATCH 1/1] drm/amd/display: Add missing cases convert_dc_color_depth_into

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Date:   Fri, 4 Jun 2021 09:32:20 -0400
From:   Harry Wentland <harry.wentland@....com>
To:     Werner Sembach <wse@...edocomputers.com>, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] drm/amd/display: Add missing cases
 convert_dc_color_depth_into_bpc

On 2021-06-04 9:16 a.m., Werner Sembach wrote:
> convert_dc_color_depth_into_bpc() that converts the enum dc_color_depth to an
> integer had the cases for COLOR_DEPTH_999 and COLOR_DEPTH_111111 missing.
> 
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 389eff96fcf6..6e82889271d5 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6515,6 +6515,10 @@ static int convert_dc_color_depth_into_bpc (enum dc_color_depth display_color_de
>  			return 14;
>  		case COLOR_DEPTH_161616:
>  			return 16;
> +		case COLOR_DEPTH_999:
> +			return 9;
> +		case COLOR_DEPTH_111111:
> +			return 11;

The color_depth returned by convert_color_depth_from_display_info will never return
9 or 11 bpc color depth. If we add these we should add them in all places where
they're needed and test the whole sequence.

I'm a bit surprised to find DC has support for 9 bpc and 11 bpc color depth but am
not sure how well tested that is.

Harry

>  		default:
>  			break;
>  		}
>