drm/i915: add update function to disable/enable-back PSR

Required function to disable PSR when going to console mode.
But also can be used whenever PSR mode entry conditions changed.

v2: Add it before PSR Hook. Update function not really been called yet.
v3: Fix coding style detected by checkpatch by Paulo Zanoni.
v4: do_enable must be static as Paulo noticed.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -1562,7 +1562,7 @@ static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
 	return true;
 }
 
-void intel_edp_psr_enable(struct intel_dp *intel_dp)
+static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
@@ -1580,6 +1580,15 @@ void intel_edp_psr_enable(struct intel_dp *intel_dp)
 	intel_edp_psr_enable_source(intel_dp);
 }
 
+void intel_edp_psr_enable(struct intel_dp *intel_dp)
+{
+	struct drm_device *dev = intel_dp_to_dev(intel_dp);
+
+	if (intel_edp_psr_match_conditions(intel_dp) &&
+	    !intel_edp_is_psr_enabled(dev))
+		intel_edp_psr_do_enable(intel_dp);
+}
+
 void intel_edp_psr_disable(struct intel_dp *intel_dp)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
@@ -1596,6 +1605,26 @@ void intel_edp_psr_disable(struct intel_dp *intel_dp)
 		DRM_ERROR("Timed out waiting for PSR Idle State\n");
 }
 
+void intel_edp_psr_update(struct drm_device *dev)
+{
+	struct intel_encoder *encoder;
+	struct intel_dp *intel_dp = NULL;
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head)
+		if (encoder->type == INTEL_OUTPUT_EDP) {
+			intel_dp = enc_to_intel_dp(&encoder->base);
+
+			if (!is_edp_psr(intel_dp))
+				return;
+
+			if (!intel_edp_psr_match_conditions(intel_dp))
+				intel_edp_psr_disable(intel_dp);
+			else
+				if (!intel_edp_is_psr_enabled(dev))
+					intel_edp_psr_do_enable(intel_dp);
+		}
+}
+
 static void intel_disable_dp(struct intel_encoder *encoder)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);

drivers/gpu/drm/i915/intel_drv.h

@@ -837,5 +837,6 @@ extern bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,
 
 extern void intel_edp_psr_enable(struct intel_dp *intel_dp);
 extern void intel_edp_psr_disable(struct intel_dp *intel_dp);
+extern void intel_edp_psr_update(struct drm_device *dev);
 
 #endif /* __INTEL_DRV_H__ */