linux-kernel - Re: [PATCH] drm/ssd130x: Change pixel format used to compute the buffer size

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Message-ID: <CAMuHMdXWfeX9EESbiSnJ-G-TuyFKt7ZnMKi2Y85HRG2695siTg@mail.gmail.com>
Date:   Thu, 13 Jul 2023 11:56:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/ssd130x: Change pixel format used to compute the
 buffer size

On Thu, Jul 13, 2023 at 10:59 AM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> The commit e254b584dbc0 ("drm/ssd130x: Remove hardcoded bits-per-pixel in
> ssd130x_buf_alloc()") used a pixel format info instead of a hardcoded bpp
> to calculate the size of the buffer allocated to store the native pixels.
>
> But that wrongly used the DRM_FORMAT_C1 fourcc pixel format, which is for
> color-indexed frame buffer formats. While the ssd103x controllers don't
> support different single-channel colors nor a Color Lookup Table (CLUT).
>
> Both formats use eight pixels/byte, so in practice there is no functional
> changes in this patch. But still the correct pixel format should be used.
>
> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds