drm/i915: Introduce intel_panel_drrs_type()

Add a helper to determine which type of DRRS the panel supports.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311172428.14685-10-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -48,11 +48,8 @@
  */
 
 static bool can_enable_drrs(struct intel_connector *connector,
-			    const struct intel_crtc_state *pipe_config,
-			    const struct drm_display_mode *downclock_mode)
+			    const struct intel_crtc_state *pipe_config)
 {
-	const struct drm_i915_private *i915 = to_i915(connector->base.dev);
-
 	if (pipe_config->vrr.enable)
 		return false;
 
@@ -65,8 +62,7 @@ static bool can_enable_drrs(struct intel_connector *connector,
 	if (pipe_config->has_psr)
 		return false;
 
-	return downclock_mode &&
-		i915->vbt.drrs_type == DRRS_TYPE_SEAMLESS;
+	return intel_panel_drrs_type(connector) == DRRS_TYPE_SEAMLESS;
 }
 
 void
@@ -80,7 +76,7 @@ intel_drrs_compute_config(struct intel_dp *intel_dp,
 		intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
 	int pixel_clock;
 
-	if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {
+	if (!can_enable_drrs(connector, pipe_config)) {
 		if (intel_cpu_transcoder_has_m2_n2(i915, pipe_config->cpu_transcoder))
 			intel_zero_m_n(&pipe_config->dp_m2_n2);
 		return;

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

@@ -83,6 +83,16 @@ int intel_panel_get_modes(struct intel_connector *connector)
 	return num_modes;
 }
 
+enum drrs_type intel_panel_drrs_type(struct intel_connector *connector)
+{
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+
+	if (!connector->panel.downclock_mode)
+		return DRRS_TYPE_NONE;
+
+	return i915->vbt.drrs_type;
+}
+
 int intel_panel_compute_config(struct intel_connector *connector,
 			       struct drm_display_mode *adjusted_mode)
 {

drivers/gpu/drm/i915/display/intel_panel.h

@@ -9,6 +9,7 @@
 #include <linux/types.h>
 
 enum drm_connector_status;
+enum drrs_type;
 struct drm_connector;
 struct drm_connector_state;
 struct drm_display_mode;
@@ -33,6 +34,7 @@ const struct drm_display_mode *
 intel_panel_downclock_mode(struct intel_connector *connector,
 			   const struct drm_display_mode *adjusted_mode);
 int intel_panel_get_modes(struct intel_connector *connector);
+enum drrs_type intel_panel_drrs_type(struct intel_connector *connector);
 enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
 		       const struct drm_display_mode *mode);