drm/i915: DDI: call intel_psr_ and _edp_drrs_enable() on pipe updates (v2)

Call intel_psr_enable() and intel_edp_drrs_enable() on pipe updates to make
sure that we enable PSR / DRRS (when applicable) on fastsets.

Note calling these functions when PSR / DRRS has already been enabled is a
no-op, so it is safe to do this on every encoder->update_pipe callback.

Changes in v2:
-Merge the patches adding the intel_psr_enable() and intel_edp_drrs_enable()
 calls into a single patch
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181220132120.15318-3-hdegoede@redhat.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -3537,6 +3537,24 @@ static void intel_disable_ddi(struct intel_encoder *encoder,
 		intel_disable_ddi_dp(encoder, old_crtc_state, old_conn_state);
 }
 
+static void intel_ddi_update_pipe_dp(struct intel_encoder *encoder,
+				     const struct intel_crtc_state *crtc_state,
+				     const struct drm_connector_state *conn_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+	intel_psr_enable(intel_dp, crtc_state);
+	intel_edp_drrs_enable(intel_dp, crtc_state);
+}
+
+static void intel_ddi_update_pipe(struct intel_encoder *encoder,
+				  const struct intel_crtc_state *crtc_state,
+				  const struct drm_connector_state *conn_state)
+{
+	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
+		intel_ddi_update_pipe_dp(encoder, crtc_state, conn_state);
+}
+
 static void intel_ddi_set_fia_lane_count(struct intel_encoder *encoder,
 					 const struct intel_crtc_state *pipe_config,
 					 enum port port)
@@ -4169,6 +4187,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	intel_encoder->pre_enable = intel_ddi_pre_enable;
 	intel_encoder->disable = intel_disable_ddi;
 	intel_encoder->post_disable = intel_ddi_post_disable;
+	intel_encoder->update_pipe = intel_ddi_update_pipe;
 	intel_encoder->get_hw_state = intel_ddi_get_hw_state;
 	intel_encoder->get_config = intel_ddi_get_config;
 	intel_encoder->suspend = intel_ddi_encoder_suspend;