[PATCH 7/8] drm/fb-helper: Add support for DRM_FORMAT_R1

[Javier Martinez Canillas]

Geert Uytterhoeven <geert at linux-m68k.org> writes:

> Add support for the monochrome light-on-dark buffer format (R1) to the
> fb helper, so this format can be used for fbdev emulation and for the
> text console.  This avoids the overhead of using XR24 and the associated
> conversions on display hardware that supports only a simple monochrome
> format.
>
> R1 is very similar to C1 (monochrome indexed color), and shares the same
> depth and bpp.  As drm_mode_legacy_fb_format() returns a format based on
> only depth and bpp, it cannot distinguish between R1 and C1.  Hence
> drm_fb_helper_find_format() is modified to try to fall back to R1 if C1
> is not supported.
>
> Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
> ---

Reviewed-by: Javier Martinez Canillas <javierm at redhat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat