drm/i915: check fb->pixel_format instead of bits_per_pixel
We've mostly switched over to the new more flexible schema, but there's one check left in the modeset code. Motivated by a question from Ville whether there's really no way an unsupported pixel_format can escape into our platform update_plane callbacks. v2: Ville noticed that the fb->depth check is redudant when we already check fb->pixel_format. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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