drm/i915: Bury c8_planes_changed() in intel_color_check()

The c8_planes_changed() check in the high level atomic code is
a bit of an eyesore. Push it inside intel_color_check() so the
high level code doesn't have to care about this stuff.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240523182818.15382-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_color.c

@@ -1986,9 +1986,18 @@ int intel_color_check(struct intel_atomic_state *state,
 		      struct intel_crtc *crtc)
 {
 	struct drm_i915_private *i915 = to_i915(state->base.dev);
-	const struct intel_crtc_state *new_crtc_state =
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+	struct intel_crtc_state *new_crtc_state =
 		intel_atomic_get_new_crtc_state(state, crtc);
 
+	/*
+	 * May need to update pipe gamma enable bits
+	 * when C8 planes are getting enabled/disabled.
+	 */
+	if (!old_crtc_state->c8_planes != !new_crtc_state->c8_planes)
+		new_crtc_state->uapi.color_mgmt_changed = true;
+
 	if (!intel_crtc_needs_color_update(new_crtc_state))
 		return 0;
 

drivers/gpu/drm/i915/display/intel_display.c

@@ -4138,17 +4138,6 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
 	return 0;
 }
 
-static bool c8_planes_changed(const struct intel_crtc_state *new_crtc_state)
-{
-	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
-	struct intel_atomic_state *state =
-		to_intel_atomic_state(new_crtc_state->uapi.state);
-	const struct intel_crtc_state *old_crtc_state =
-		intel_atomic_get_old_crtc_state(state, crtc);
-
-	return !old_crtc_state->c8_planes != !new_crtc_state->c8_planes;
-}
-
 static u16 hsw_linetime_wm(const struct intel_crtc_state *crtc_state)
 {
 	const struct drm_display_mode *pipe_mode =
@@ -4247,13 +4236,6 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
 			return ret;
 	}
 
-	/*
-	 * May need to update pipe gamma enable bits
-	 * when C8 planes are getting enabled/disabled.
-	 */
-	if (c8_planes_changed(crtc_state))
-		crtc_state->uapi.color_mgmt_changed = true;
-
 	ret = intel_color_check(state, crtc);
 	if (ret)
 		return ret;