drm/i915: Introduce intel_panel_{fixed,downclock}_mode()

Abstract away the details on where we store the fixed/downclock
modes, and also how we select them. Will be useful for static
DRRS (aka. allowing the user to select the refresh rate for the
panel).

We pass in the user requested mode to intel_panel_fixed_mode()
so that in the future it may try to match the refresh rate.
And intel_panel_downclock_mode() gets passed the adjusted_mode
we actually chose to use so that it may find a suitable lower
resresh rate variant.

v2: Hook it up for all encoders
    s/fixed_mode/adjusted_mode/ in intel_panel_downclock_mode() (Jani)
    Elaborate on the choice or arguments for the functions (Jani)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311172428.14685-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -918,8 +918,8 @@ intel_dp_mode_valid(struct drm_connector *connector,
 {
 	struct intel_dp *intel_dp = intel_attached_dp(to_intel_connector(connector));
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	const struct drm_display_mode *fixed_mode;
 	int target_clock = mode->clock;
 	int max_rate, mode_rate, max_lanes, max_link_clock;
 	int max_dotclk = dev_priv->max_dotclk_freq;
@@ -934,6 +934,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 		return MODE_H_ILLEGAL;
 
+	fixed_mode = intel_panel_fixed_mode(intel_connector, mode);
 	if (intel_dp_is_edp(intel_dp) && fixed_mode) {
 		status = intel_panel_mode_valid(intel_connector, mode);
 		if (status != MODE_OK)
@@ -1797,6 +1798,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	const struct drm_display_mode *fixed_mode;
 	enum port port = encoder->port;
 	struct intel_connector *intel_connector = intel_dp->attached_connector;
 	struct intel_digital_connector_state *intel_conn_state =
@@ -1823,7 +1825,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	else
 		pipe_config->has_audio = intel_conn_state->force_audio == HDMI_AUDIO_ON;
 
-	if (intel_dp_is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
+	fixed_mode = intel_panel_fixed_mode(intel_connector, adjusted_mode);
+	if (intel_dp_is_edp(intel_dp) && fixed_mode) {
 		ret = intel_panel_compute_config(intel_connector, adjusted_mode);
 		if (ret)
 			return ret;

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

@@ -48,7 +48,8 @@
  */
 
 static bool can_enable_drrs(struct intel_connector *connector,
-			    const struct intel_crtc_state *pipe_config)
+			    const struct intel_crtc_state *pipe_config,
+			    const struct drm_display_mode *downclock_mode)
 {
 	const struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
@@ -64,7 +65,7 @@ static bool can_enable_drrs(struct intel_connector *connector,
 	if (pipe_config->has_psr)
 		return false;
 
-	return connector->panel.downclock_mode &&
+	return downclock_mode &&
 		i915->vbt.drrs_type == DRRS_TYPE_SEAMLESS;
 }
 
@@ -75,9 +76,11 @@ intel_drrs_compute_config(struct intel_dp *intel_dp,
 {
 	struct intel_connector *connector = intel_dp->attached_connector;
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	const struct drm_display_mode *downclock_mode =
+		intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
 	int pixel_clock;
 
-	if (!can_enable_drrs(connector, pipe_config)) {
+	if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {
 		if (intel_cpu_transcoder_has_m2_n2(i915, pipe_config->cpu_transcoder))
 			intel_zero_m_n(&pipe_config->dp_m2_n2);
 		return;
@@ -88,7 +91,7 @@ intel_drrs_compute_config(struct intel_dp *intel_dp,
 
 	pipe_config->has_drrs = true;
 
-	pixel_clock = connector->panel.downclock_mode->clock;
+	pixel_clock = downclock_mode->clock;
 	if (pipe_config->splitter.enable)
 		pixel_clock /= pipe_config->splitter.link_count;
 

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

@@ -61,7 +61,8 @@ enum drm_mode_status intel_dsi_mode_valid(struct drm_connector *connector,
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
+	const struct drm_display_mode *fixed_mode =
+		intel_panel_fixed_mode(intel_connector, mode);
 	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 	enum drm_mode_status status;
 

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

@@ -226,7 +226,7 @@ intel_dvo_mode_valid(struct drm_connector *connector,
 	struct intel_connector *intel_connector = to_intel_connector(connector);
 	struct intel_dvo *intel_dvo = intel_attached_dvo(intel_connector);
 	const struct drm_display_mode *fixed_mode =
-		intel_connector->panel.fixed_mode;
+		intel_panel_fixed_mode(intel_connector, mode);
 	int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 	int target_clock = mode->clock;
 
@@ -257,9 +257,9 @@ static int intel_dvo_compute_config(struct intel_encoder *encoder,
 {
 	struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 	struct intel_connector *connector = to_intel_connector(conn_state->connector);
-	const struct drm_display_mode *fixed_mode =
-		intel_dvo->attached_connector->panel.fixed_mode;
 	struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
+	const struct drm_display_mode *fixed_mode =
+		intel_panel_fixed_mode(intel_dvo->attached_connector, adjusted_mode);
 
 	/*
 	 * If we have timings from the BIOS for the panel, put them in

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

@@ -389,7 +389,8 @@ intel_lvds_mode_valid(struct drm_connector *connector,
 		      struct drm_display_mode *mode)
 {
 	struct intel_connector *intel_connector = to_intel_connector(connector);
-	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
+	const struct drm_display_mode *fixed_mode =
+		intel_panel_fixed_mode(intel_connector, mode);
 	int max_pixclk = to_i915(connector->dev)->max_dotclk_freq;
 	enum drm_mode_status status;
 

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

@@ -45,10 +45,25 @@ bool intel_panel_use_ssc(struct drm_i915_private *i915)
 		&& !(i915->quirks & QUIRK_LVDS_SSC_DISABLE);
 }
 
+const struct drm_display_mode *
+intel_panel_fixed_mode(struct intel_connector *connector,
+		       const struct drm_display_mode *mode)
+{
+	return connector->panel.fixed_mode;
+}
+
+const struct drm_display_mode *
+intel_panel_downclock_mode(struct intel_connector *connector,
+			   const struct drm_display_mode *adjusted_mode)
+{
+	return connector->panel.downclock_mode;
+}
+
 int intel_panel_compute_config(struct intel_connector *connector,
 			       struct drm_display_mode *adjusted_mode)
 {
-	const struct drm_display_mode *fixed_mode = connector->panel.fixed_mode;
+	const struct drm_display_mode *fixed_mode =
+		intel_panel_fixed_mode(connector, adjusted_mode);
 
 	if (!fixed_mode)
 		return 0;
@@ -508,7 +523,8 @@ enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
 		       const struct drm_display_mode *mode)
 {
-	const struct drm_display_mode *fixed_mode = connector->panel.fixed_mode;
+	const struct drm_display_mode *fixed_mode =
+		intel_panel_fixed_mode(connector, mode);
 
 	if (!fixed_mode)
 		return MODE_OK;

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

@@ -24,8 +24,12 @@ void intel_panel_fini(struct intel_panel *panel);
 enum drm_connector_status
 intel_panel_detect(struct drm_connector *connector, bool force);
 bool intel_panel_use_ssc(struct drm_i915_private *i915);
-void intel_panel_fixed_mode(const struct drm_display_mode *fixed_mode,
-			    struct drm_display_mode *adjusted_mode);
+const struct drm_display_mode *
+intel_panel_fixed_mode(struct intel_connector *connector,
+		       const struct drm_display_mode *mode);
+const struct drm_display_mode *
+intel_panel_downclock_mode(struct intel_connector *connector,
+			   const struct drm_display_mode *adjusted_mode);
 enum drm_mode_status
 intel_panel_mode_valid(struct intel_connector *connector,
 		       const struct drm_display_mode *mode);

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

@@ -795,7 +795,7 @@ intel_sdvo_create_preferred_input_timing(struct intel_sdvo *intel_sdvo,
 
 	if (IS_LVDS(intel_sdvo_connector)) {
 		const struct drm_display_mode *fixed_mode =
-			intel_sdvo_connector->base.panel.fixed_mode;
+			intel_panel_fixed_mode(&intel_sdvo_connector->base, mode);
 
 		if (fixed_mode->hdisplay != args.width ||
 		    fixed_mode->vdisplay != args.height)
@@ -1331,6 +1331,8 @@ static int intel_sdvo_compute_config(struct intel_encoder *encoder,
 							   adjusted_mode);
 		pipe_config->sdvo_tv_clock = true;
 	} else if (IS_LVDS(intel_sdvo_connector)) {
+		const struct drm_display_mode *fixed_mode =
+			intel_panel_fixed_mode(&intel_sdvo_connector->base, mode);
 		int ret;
 
 		ret = intel_panel_compute_config(&intel_sdvo_connector->base,
@@ -1338,8 +1340,7 @@ static int intel_sdvo_compute_config(struct intel_encoder *encoder,
 		if (ret)
 			return ret;
 
-		if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo,
-							     intel_sdvo_connector->base.panel.fixed_mode))
+		if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo, fixed_mode))
 			return -EINVAL;
 
 		(void) intel_sdvo_get_preferred_input_mode(intel_sdvo,
@@ -1461,7 +1462,7 @@ static void intel_sdvo_pre_enable(struct intel_atomic_state *state,
 	const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 	const struct intel_sdvo_connector_state *sdvo_state =
 		to_intel_sdvo_connector_state(conn_state);
-	const struct intel_sdvo_connector *intel_sdvo_connector =
+	struct intel_sdvo_connector *intel_sdvo_connector =
 		to_intel_sdvo_connector(conn_state->connector);
 	const struct drm_display_mode *mode = &crtc_state->hw.mode;
 	struct intel_sdvo *intel_sdvo = to_sdvo(intel_encoder);
@@ -1492,11 +1493,14 @@ static void intel_sdvo_pre_enable(struct intel_atomic_state *state,
 		return;
 
 	/* lvds has a special fixed output timing. */
-	if (IS_LVDS(intel_sdvo_connector))
-		intel_sdvo_get_dtd_from_mode(&output_dtd,
-					     intel_sdvo_connector->base.panel.fixed_mode);
-	else
+	if (IS_LVDS(intel_sdvo_connector)) {
+		const struct drm_display_mode *fixed_mode =
+			intel_panel_fixed_mode(&intel_sdvo_connector->base, mode);
+
+		intel_sdvo_get_dtd_from_mode(&output_dtd, fixed_mode);
+	} else {
 		intel_sdvo_get_dtd_from_mode(&output_dtd, mode);
+	}
 	if (!intel_sdvo_set_output_timing(intel_sdvo, &output_dtd))
 		drm_info(&dev_priv->drm,
 			 "Setting output timings on %s failed\n",