drm/simpledrm: Set preferred depth from format of scanout buffer
Set the preferred depth from the format of the scanout buffer. The value cannot be hardcoded, as the scanout buffer is only known at runtime. Also derive the fbdev emulation's bpp value from the scanout format. v2: * fix commit-message typo Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20221123115348.2521-6-tzimmermann@suse.de
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