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commit db05c48197 upstream.
drm fbdev emulation doesn't support changing the pixel format at all,
so reject all pixel format changing requests.
Cc: stable@vger.kernel.org
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181003164538.5534-1-Eugeniy.Paltsev@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>