[RFC 2/7] drm: Add GEM backed framebuffer library

[Eric Anholt]

Noralf Trønnes <noralf at tronnes.org> writes:

> Den 12.07.2017 15.46, skrev Noralf Trønnes:
>> Add a library for drivers that can use a simple representation
>> of a GEM backed framebuffer.
>>
>> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
>> ---
>
> This patch adds a gem backed drm_framebuffer like this:
>
> struct drm_fb_gem {
>      /**
>       * @base: Base DRM framebuffer
>       */
>      struct drm_framebuffer base;
>      /**
>       * @obj: GEM object array backing the framebuffer. One object per
>       * plane.
>       */
>      struct drm_gem_object *obj[4];
> };
>
> Now I wonder if it would be better to extend drm_framebuffer instead:
>
>   struct drm_framebuffer {
> +    /**
> +     * @obj: GEM objects backing the framebuffer, one per plane (optional).
> +     */
> +    struct drm_gem_object *obj[4];
>   };

FWIW, I would love to see this tried.  I think we would end up with some
nice cleanups if we did so.
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