drm/i915: add missing condition for committing planes on crtc

The i915 driver checks for color management properties changes as part
of a plane update. Therefore a color management update must imply a
plane update, otherwise we never update the transformation matrixes
and degamma/gamma LUTs.

v2: add comment about moving the commit of color management registers
    to an async worker

v3: Commit color management register right after vblank

v4: Move back color management commit condition together with planes
    commit

v5: Trigger color management commit through the planes commit (Daniel)

v6: Make plane change update more readable

Fixes: 20a34e7 (drm/i915: Update color management during vblank evasion.)
Cc: Maarten Lankhorst <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Signed-off-by: Lionel Landwerlin <[email protected]>
References: https://lkml.org/lkml/2016/7/14/614
Reviewed-and-tested-by: Mario Kleiner <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit e7852a4)
Signed-off-by: Daniel Vetter <[email protected]>

Author: llandwerlin-intel

drivers/gpu/drm/i915/intel_display.c

@@ -11997,6 +11997,12 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
 		ret = intel_color_check(crtc, crtc_state);
 		if (ret)
 			return ret;
+
+		/*
+		 * Changing color management on Intel hardware is
+		 * handled as part of planes update.
+		 */
+		crtc_state->planes_changed = true;
 	}
 
 	ret = 0;