drm/i915/display: Disable DRRS when needed in fastsets

Changes in the configuration could cause PSR to be compatible and
enabled so driver must also be able to disable DRRS when doing
fastsets.

v2: Fixed name of DRRS compute function (Anshuman)

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/209
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/173
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/209
Cc: Srinivas K <srinivasx.k@intel.com>
Cc: Hariom Pandey <hariom.pandey@intel.com>
Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200825171331.17971-2-jose.souza@intel.com

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

@@ -4012,7 +4012,7 @@ static void intel_ddi_update_pipe_dp(struct intel_atomic_state *state,
 
 	intel_psr_update(intel_dp, crtc_state, conn_state);
 	intel_dp_set_infoframes(encoder, true, crtc_state, conn_state);
-	intel_edp_drrs_enable(intel_dp, crtc_state);
+	intel_edp_drrs_update(intel_dp, crtc_state);
 
 	intel_panel_update_backlight(state, encoder, crtc_state, conn_state);
 }

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

@@ -7728,6 +7728,15 @@ static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
 		    refresh_rate);
 }
 
+static void
+intel_edp_drrs_enable_locked(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+
+	dev_priv->drrs.busy_frontbuffer_bits = 0;
+	dev_priv->drrs.dp = intel_dp;
+}
+
 /**
  * intel_edp_drrs_enable - init drrs struct if supported
  * @intel_dp: DP struct
@@ -7746,19 +7755,34 @@ void intel_edp_drrs_enable(struct intel_dp *intel_dp,
 	drm_dbg_kms(&dev_priv->drm, "Enabling DRRS\n");
 
 	mutex_lock(&dev_priv->drrs.mutex);
+
 	if (dev_priv->drrs.dp) {
-		drm_dbg_kms(&dev_priv->drm, "DRRS already enabled\n");
+		drm_warn(&dev_priv->drm, "DRRS already enabled\n");
 		goto unlock;
 	}
 
-	dev_priv->drrs.busy_frontbuffer_bits = 0;
-
-	dev_priv->drrs.dp = intel_dp;
+	intel_edp_drrs_enable_locked(intel_dp);
 
 unlock:
 	mutex_unlock(&dev_priv->drrs.mutex);
 }
 
+static void
+intel_edp_drrs_disable_locked(struct intel_dp *intel_dp,
+			      const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+
+	if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR) {
+		int refresh;
+
+		refresh = drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode);
+		intel_dp_set_drrs_state(dev_priv, crtc_state, refresh);
+	}
+
+	dev_priv->drrs.dp = NULL;
+}
+
 /**
  * intel_edp_drrs_disable - Disable DRRS
  * @intel_dp: DP struct
@@ -7779,16 +7803,45 @@ void intel_edp_drrs_disable(struct intel_dp *intel_dp,
 		return;
 	}
 
-	if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
-		intel_dp_set_drrs_state(dev_priv, old_crtc_state,
-			drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode));
-
-	dev_priv->drrs.dp = NULL;
+	intel_edp_drrs_disable_locked(intel_dp, old_crtc_state);
 	mutex_unlock(&dev_priv->drrs.mutex);
 
 	cancel_delayed_work_sync(&dev_priv->drrs.work);
 }
 
+/**
+ * intel_edp_drrs_update - Update DRRS state
+ * @intel_dp: Intel DP
+ * @crtc_state: new CRTC state
+ *
+ * This function will update DRRS states, disabling or enabling DRRS when
+ * executing fastsets. For full modeset, intel_edp_drrs_disable() and
+ * intel_edp_drrs_enable() should be called instead.
+ */
+void
+intel_edp_drrs_update(struct intel_dp *intel_dp,
+		      const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+
+	if (dev_priv->drrs.type != SEAMLESS_DRRS_SUPPORT)
+		return;
+
+	mutex_lock(&dev_priv->drrs.mutex);
+
+	/* New state matches current one? */
+	if (crtc_state->has_drrs == !!dev_priv->drrs.dp)
+		goto unlock;
+
+	if (crtc_state->has_drrs)
+		intel_edp_drrs_enable_locked(intel_dp);
+	else
+		intel_edp_drrs_disable_locked(intel_dp, crtc_state);
+
+unlock:
+	mutex_unlock(&dev_priv->drrs.mutex);
+}
+
 static void intel_edp_drrs_downclock_work(struct work_struct *work)
 {
 	struct drm_i915_private *dev_priv =

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

@@ -81,6 +81,8 @@ void intel_edp_drrs_enable(struct intel_dp *intel_dp,
 			   const struct intel_crtc_state *crtc_state);
 void intel_edp_drrs_disable(struct intel_dp *intel_dp,
 			    const struct intel_crtc_state *crtc_state);
+void intel_edp_drrs_update(struct intel_dp *intel_dp,
+			   const struct intel_crtc_state *crtc_state);
 void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
 			       unsigned int frontbuffer_bits);
 void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,