linux-kernel - Re: [PATCH] drm/sun4i: Fix DE2 YVU handling

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Message-ID: <CAGphcdnT4U8AztL_B_B2HYskQSAYKRgCQcnO3Q8Qj+UFO082hQ@mail.gmail.com>
Date:   Wed, 2 Sep 2020 10:01:17 +0300
From:   Roman Stratiienko <r.stratiienko@...il.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     mripard@...nel.org, wens@...e.org, irlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/sun4i: Fix DE2 YVU handling

ср, 2 сент. 2020 г. в 00:58, Jernej Skrabec <jernej.skrabec@...l.net>:
>
> Function sun8i_vi_layer_get_csc_mode() is supposed to return CSC mode
> but due to inproper return type (bool instead of u32) it returns just 0
> or 1. Colors are wrong for YVU formats because of that.
>
> Fixes: daab3d0e8e2b ("drm/sun4i: de2: csc_mode in de2 format struct is mostly redundant")
> Reported-by: Roman Stratiienko <r.stratiienko@...il.com>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> ---
>  drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> index 22c8c5375d0d..c0147af6a840 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> @@ -211,7 +211,7 @@ static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
>         return 0;
>  }
>
> -static bool sun8i_vi_layer_get_csc_mode(const struct drm_format_info *format)
> +static u32 sun8i_vi_layer_get_csc_mode(const struct drm_format_info *format)
>  {
>         if (!format->is_yuv)
>                 return SUN8I_CSC_MODE_OFF;
> --
> 2.28.0
>

Hi Jernej,

Thank you for the fix.
I can confirm this patch fixes the issue with wrong colors.

Let me share my thoughts:
I've looked into csc code, and it seems to me reordering U, V offsets
should be a much simpler solution than applying
color transformation matrices.It should also simplify adding more
color encodings in the future.

Regards,
Roman