linux-kernel - Re: [PATCH v2 06/10] drm/fb-helper: Add support for DRM_FORMAT

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Date:   Wed, 9 Mar 2022 14:14:32 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>, Helge Deller <deller@....de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/10] drm/fb-helper: Add support for DRM_FORMAT_C[124]

Hi Javier,

On Wed, Mar 9, 2022 at 2:10 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> On 3/7/22 21:52, Geert Uytterhoeven wrote:
> > Add support for color-indexed frame buffer formats with two, four, and
> > sixteen colors to the DRM framebuffer helper functions:
> >   1. Add support for 1, 2, and 4 bits per pixel to the damage helper,
> >   2. For color-indexed modes, the length of the color bitfields must be
> >      set to the color depth, else the logo code may pick a logo with too
> >      many colors.  Drop the incorrect DAC width comment, which
> >      originates from the i915 driver.
> >   3. Accept C[124] modes when validating or filling in struct
> >      fb_var_screeninfo, and use the correct number of bits per pixel.
> >   4. Set the visual to FB_VISUAL_PSEUDOCOLOR for all color-indexed
> >      modes.
> >
> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> [snip]
>
> >  static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
> > -                                uint32_t depth)
> > +                                bool is_color_indexed)
> >  {
> >       info->fix.type = FB_TYPE_PACKED_PIXELS;
> > -     info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
> > -             FB_VISUAL_TRUECOLOR;
> > +     info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
> > +                                         : info->fix.visual;
>
> Shouldn't this be the following instead ?
>
>   +     info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
>   +                                         : FB_VISUAL_TRUECOLOR;

Indeed. Will fix in v3.
Thanks!

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