drm/i915: Allow static DRRS on all eDP ports

Only seamless DRRS has specific hardware requirements so
we can allow static DRRS on any eDP port.

And we can replace these port checks and whatnot with
a simple check to make sure the transcoder(s) we're
about to use are capable of seamless DRRS.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220331112822.11462-11-ville.syrjala@linux.intel.comAcked-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -1769,10 +1769,22 @@ intel_dp_compute_hdr_metadata_infoframe_sdp(struct intel_dp *intel_dp,
 		intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA);
 }
 
+static bool cpu_transcoder_has_drrs(struct drm_i915_private *i915,
+				    enum transcoder cpu_transcoder)
+{
+	/* M1/N1 is double buffered */
+	if (DISPLAY_VER(i915) >= 9 || IS_BROADWELL(i915))
+		return true;
+
+	return intel_cpu_transcoder_has_m2_n2(i915, cpu_transcoder);
+}
+
 static bool can_enable_drrs(struct intel_connector *connector,
 			    const struct intel_crtc_state *pipe_config,
 			    const struct drm_display_mode *downclock_mode)
 {
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+
 	if (pipe_config->vrr.enable)
 		return false;
 
@@ -1785,6 +1797,13 @@ static bool can_enable_drrs(struct intel_connector *connector,
 	if (pipe_config->has_psr)
 		return false;
 
+	/* FIXME missing FDI M2/N2 etc. */
+	if (pipe_config->has_pch_encoder)
+		return false;
+
+	if (!cpu_transcoder_has_drrs(i915, pipe_config->cpu_transcoder))
+		return false;
+
 	return downclock_mode &&
 		intel_panel_drrs_type(connector) == DRRS_TYPE_SEAMLESS;
 }
@@ -5029,39 +5048,6 @@ intel_edp_add_properties(struct intel_dp *intel_dp)
 						       fixed_mode->vdisplay);
 }
 
-static bool
-intel_edp_has_drrs(struct intel_dp *intel_dp)
-{
-	struct intel_connector *connector = intel_dp->attached_connector;
-	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
-	struct drm_i915_private *i915 = to_i915(connector->base.dev);
-
-	if (DISPLAY_VER(i915) < 5) {
-		drm_dbg_kms(&i915->drm,
-			    "[CONNECTOR:%d:%s] DRRS not supported on platform\n",
-			    connector->base.base.id, connector->base.name);
-		return false;
-	}
-
-	if ((DISPLAY_VER(i915) < 8 && !HAS_GMCH(i915)) &&
-	    encoder->port != PORT_A) {
-		drm_dbg_kms(&i915->drm,
-			    "[CONNECTOR:%d:%s] DRRS not supported on [ENCODER:%d:%s]\n",
-			    connector->base.base.id, connector->base.name,
-			    encoder->base.base.id, encoder->base.name);
-		return false;
-	}
-
-	if (i915->vbt.drrs_type == DRRS_TYPE_NONE) {
-		drm_dbg_kms(&i915->drm,
-			    "[CONNECTOR:%d:%s] DRRS not supported according to VBT\n",
-			    connector->base.base.id, connector->base.name);
-		return false;
-	}
-
-	return true;
-}
-
 static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 				     struct intel_connector *intel_connector)
 {
@@ -5126,7 +5112,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	intel_connector->edid = edid;
 
 	intel_panel_add_edid_fixed_modes(intel_connector,
-					 intel_edp_has_drrs(intel_dp));
+					 dev_priv->vbt.drrs_type != DRRS_TYPE_NONE);
 
 	/* MSO requires information from the EDID */
 	intel_edp_mso_init(intel_dp);