drm/i915: constify color function vtable.

This clarifies quite well what functions get used on what platforms
instead of having to decipher the old tree.

v2: fixed IVB mistake (Jani)
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/49e46e61206d4fdcf08fb5dc1978da3fce702134.1632869550.git.jani.nikula@intel.com

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

@@ -1137,14 +1137,14 @@ void intel_color_load_luts(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
 
-	dev_priv->color_funcs.load_luts(crtc_state);
+	dev_priv->color_funcs->load_luts(crtc_state);
 }
 
 void intel_color_commit(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
 
-	dev_priv->color_funcs.color_commit(crtc_state);
+	dev_priv->color_funcs->color_commit(crtc_state);
 }
 
 static bool intel_can_preload_luts(const struct intel_crtc_state *new_crtc_state)
@@ -1200,15 +1200,15 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
 
-	return dev_priv->color_funcs.color_check(crtc_state);
+	return dev_priv->color_funcs->color_check(crtc_state);
 }
 
 void intel_color_get_config(struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
 
-	if (dev_priv->color_funcs.read_luts)
-		dev_priv->color_funcs.read_luts(crtc_state);
+	if (dev_priv->color_funcs->read_luts)
+		dev_priv->color_funcs->read_luts(crtc_state);
 }
 
 static bool need_plane_update(struct intel_plane *plane,
@@ -2092,6 +2092,76 @@ static void icl_read_luts(struct intel_crtc_state *crtc_state)
 	}
 }
 
+static const struct intel_color_funcs chv_color_funcs = {
+	.color_check = chv_color_check,
+	.color_commit = i9xx_color_commit,
+	.load_luts = chv_load_luts,
+	.read_luts = chv_read_luts,
+};
+
+static const struct intel_color_funcs i965_color_funcs = {
+	.color_check = i9xx_color_check,
+	.color_commit = i9xx_color_commit,
+	.load_luts = i965_load_luts,
+	.read_luts = i965_read_luts,
+};
+
+static const struct intel_color_funcs i9xx_color_funcs = {
+	.color_check = i9xx_color_check,
+	.color_commit = i9xx_color_commit,
+	.load_luts = i9xx_load_luts,
+	.read_luts = i9xx_read_luts,
+};
+
+static const struct intel_color_funcs icl_color_funcs = {
+	.color_check = icl_color_check,
+	.color_commit = skl_color_commit,
+	.load_luts = icl_load_luts,
+	.read_luts = icl_read_luts,
+};
+
+static const struct intel_color_funcs glk_color_funcs = {
+	.color_check = glk_color_check,
+	.color_commit = skl_color_commit,
+	.load_luts = glk_load_luts,
+	.read_luts = glk_read_luts,
+};
+
+static const struct intel_color_funcs skl_color_funcs = {
+	.color_check = ivb_color_check,
+	.color_commit = skl_color_commit,
+	.load_luts = bdw_load_luts,
+	.read_luts = NULL,
+};
+
+static const struct intel_color_funcs bdw_color_funcs = {
+	.color_check = ivb_color_check,
+	.color_commit = hsw_color_commit,
+	.load_luts = bdw_load_luts,
+	.read_luts = NULL,
+};
+
+static const struct intel_color_funcs hsw_color_funcs = {
+	.color_check = ivb_color_check,
+	.color_commit = hsw_color_commit,
+	.load_luts = ivb_load_luts,
+	.read_luts = NULL,
+};
+
+static const struct intel_color_funcs ivb_color_funcs = {
+	.color_check = ivb_color_check,
+	.color_commit = ilk_color_commit,
+	.load_luts = ivb_load_luts,
+	.read_luts = NULL,
+};
+
+static const struct intel_color_funcs ilk_color_funcs = {
+	.color_check = ilk_color_check,
+	.color_commit = ilk_color_commit,
+	.load_luts = ilk_load_luts,
+	.read_luts = ilk_read_luts,
+};
+
 void intel_color_init(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -2101,52 +2171,28 @@ void intel_color_init(struct intel_crtc *crtc)
 
 	if (HAS_GMCH(dev_priv)) {
 		if (IS_CHERRYVIEW(dev_priv)) {
-			dev_priv->color_funcs.color_check = chv_color_check;
-			dev_priv->color_funcs.color_commit = i9xx_color_commit;
-			dev_priv->color_funcs.load_luts = chv_load_luts;
-			dev_priv->color_funcs.read_luts = chv_read_luts;
+			dev_priv->color_funcs = &chv_color_funcs;
 		} else if (DISPLAY_VER(dev_priv) >= 4) {
-			dev_priv->color_funcs.color_check = i9xx_color_check;
-			dev_priv->color_funcs.color_commit = i9xx_color_commit;
-			dev_priv->color_funcs.load_luts = i965_load_luts;
-			dev_priv->color_funcs.read_luts = i965_read_luts;
+			dev_priv->color_funcs = &i965_color_funcs;
 		} else {
-			dev_priv->color_funcs.color_check = i9xx_color_check;
-			dev_priv->color_funcs.color_commit = i9xx_color_commit;
-			dev_priv->color_funcs.load_luts = i9xx_load_luts;
-			dev_priv->color_funcs.read_luts = i9xx_read_luts;
+			dev_priv->color_funcs = &i9xx_color_funcs;
 		}
 	} else {
 		if (DISPLAY_VER(dev_priv) >= 11)
-			dev_priv->color_funcs.color_check = icl_color_check;
-		else if (DISPLAY_VER(dev_priv) >= 10)
-			dev_priv->color_funcs.color_check = glk_color_check;
-		else if (DISPLAY_VER(dev_priv) >= 7)
-			dev_priv->color_funcs.color_check = ivb_color_check;
-		else
-			dev_priv->color_funcs.color_check = ilk_color_check;
-
-		if (DISPLAY_VER(dev_priv) >= 9)
-			dev_priv->color_funcs.color_commit = skl_color_commit;
-		else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
-			dev_priv->color_funcs.color_commit = hsw_color_commit;
-		else
-			dev_priv->color_funcs.color_commit = ilk_color_commit;
-
-		if (DISPLAY_VER(dev_priv) >= 11) {
-			dev_priv->color_funcs.load_luts = icl_load_luts;
-			dev_priv->color_funcs.read_luts = icl_read_luts;
-		} else if (DISPLAY_VER(dev_priv) == 10) {
-			dev_priv->color_funcs.load_luts = glk_load_luts;
-			dev_priv->color_funcs.read_luts = glk_read_luts;
-		} else if (DISPLAY_VER(dev_priv) >= 8) {
-			dev_priv->color_funcs.load_luts = bdw_load_luts;
-		} else if (DISPLAY_VER(dev_priv) >= 7) {
-			dev_priv->color_funcs.load_luts = ivb_load_luts;
-		} else {
-			dev_priv->color_funcs.load_luts = ilk_load_luts;
-			dev_priv->color_funcs.read_luts = ilk_read_luts;
-		}
+			dev_priv->color_funcs = &icl_color_funcs;
+		else if (DISPLAY_VER(dev_priv) == 10)
+			dev_priv->color_funcs = &glk_color_funcs;
+		else if (DISPLAY_VER(dev_priv) == 9)
+			dev_priv->color_funcs = &skl_color_funcs;
+		else if (DISPLAY_VER(dev_priv) == 8)
+			dev_priv->color_funcs = &bdw_color_funcs;
+		else if (DISPLAY_VER(dev_priv) == 7) {
+			if (IS_HASWELL(dev_priv))
+				dev_priv->color_funcs = &hsw_color_funcs;
+			else
+				dev_priv->color_funcs = &ivb_color_funcs;
+		} else
+			dev_priv->color_funcs = &ilk_color_funcs;
 	}
 
 	drm_crtc_enable_color_mgmt(&crtc->base,

drivers/gpu/drm/i915/i915_drv.h

@@ -1000,7 +1000,7 @@ struct drm_i915_private {
 	struct drm_i915_display_funcs display;
 
 	/* Display internal color functions */
-	struct intel_color_funcs color_funcs;
+	const struct intel_color_funcs *color_funcs;
 
 	/* Display internal audio functions */
 	struct intel_audio_funcs audio_funcs;