[PATCH 2/2] drm/fb-helper: Don't load the display palette if the CRTC is disabled

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Often the hardware needs certain clocks running when accessing the
palette, so don't go poking at it if the CRTC is disabled. We still
call the fb_helper gamma_set hooks to update the driver's notion of
what the palette should contain, so that if/when CRTC gets enabled,
the driver will load the correct palette.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
The other option would of course to put the check into the load_lut
function itself. I don't really care which way we do it as long as
the check is somewhere...

 drivers/gpu/drm/drm_fb_helper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 1b6ca23..4ecf128 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -663,7 +663,9 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 			if (rc)
 				goto out;
 		}
-		crtc_funcs->load_lut(crtc);
+
+		if (crtc->enabled)
+			crtc_funcs->load_lut(crtc);
 	}
  out:
 	drm_modeset_unlock_all(dev);
-- 
1.8.1.5