drm/fb-helper: Make load_lut and gamma_set/gamma_get hooks optional
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Mon, 27 May 2013 17:19:57 +0000 (20:19 +0300)
committerDave Airlie <airlied@gmail.com>
Mon, 17 Jun 2013 09:42:47 +0000 (19:42 +1000)
commit04c0c569d4358d0e2f9c78ca9fc0ddeb68ae4872
tree812f493c7a60c6eca19e529c2804ce584419287b
parent8391a3d5bc6269cb0622c136ec7f125a2d5fb5f9
drm/fb-helper: Make load_lut and gamma_set/gamma_get hooks optional

Check whether the crtc provides the load_lut callback before calling it.
This allows the driver to provide the hook only for those CRTCs that
actually have the hardware support for it.

Also check whether the driver provided the fb_helper gamma_set/gamma_get
hooks. It's a driver bug if it allows non-truecolor fbdev visuals w/o
these hooks, but auditing all the drivers is too tedious. So just slap
a big WARN_ON() there and bail out before things start to explode.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>
drivers/gpu/drm/drm_fb_helper.c