drm/i915/psr: Do not override PSR2 sink support

Sink can support our PSR2 requirements but userspace can request
a resolution that PSR2 hardware do not support, in this case it
was overwritten the PSR2 sink support.
Adding another flag here, this way if requested resolution changed
to a value that PSR2 hardware can handle, PSR2 can be enabled.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NJosé Roberto de Souza <jose.souza@intel.com>
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180328223046.16125-6-jose.souza@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2630,7 +2630,7 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
 		   yesno(work_busy(&dev_priv->psr.work.work)));
 
 	if (HAS_DDI(dev_priv)) {
-		if (dev_priv->psr.psr2_support)
+		if (dev_priv->psr.psr2_enabled)
 			enabled = I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE;
 		else
 			enabled = I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE;
@@ -2678,7 +2678,7 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
 
 		seq_printf(m, "Performance_Counter: %u\n", psrperf);
 	}
-	if (dev_priv->psr.psr2_support) {
+	if (dev_priv->psr.psr2_enabled) {
 		u32 psr2 = I915_READ(EDP_PSR2_STATUS);
 
 		seq_printf(m, "EDP_PSR2_STATUS: %x [%s]\n",

drivers/gpu/drm/i915/i915_drv.h

@@ -602,11 +602,12 @@ struct i915_psr {
 	bool active;
 	struct delayed_work work;
 	unsigned busy_frontbuffer_bits;
-	bool psr2_support;
+	bool sink_psr2_support;
 	bool link_standby;
 	bool colorimetry_support;
 	bool alpm;
 	bool has_hw_tracking;
+	bool psr2_enabled;
 
 	void (*enable_source)(struct intel_dp *,
 			      const struct intel_crtc_state *);

drivers/gpu/drm/i915/intel_psr.c

@@ -148,11 +148,12 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
 		 * Y-coordinate requirement panels we would need to enable
 		 * GTC first.
 		 */
-		dev_priv->psr.psr2_support = intel_dp_get_y_coord_required(intel_dp);
-		DRM_DEBUG_KMS("PSR2 %s on sink",
-			      dev_priv->psr.psr2_support ? "supported" : "not supported");
+		dev_priv->psr.sink_psr2_support =
+				intel_dp_get_y_coord_required(intel_dp);
+		DRM_DEBUG_KMS("PSR2 %s on sink", dev_priv->psr.sink_psr2_support
+			      ? "supported" : "not supported");
 
-		if (dev_priv->psr.psr2_support) {
+		if (dev_priv->psr.sink_psr2_support) {
 			dev_priv->psr.colorimetry_support =
 				intel_dp_get_colorimetry_status(intel_dp);
 			dev_priv->psr.alpm =
@@ -193,7 +194,7 @@ static void hsw_psr_setup_vsc(struct intel_dp *intel_dp,
 	struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev);
 	struct edp_vsc_psr psr_vsc;
 
-	if (dev_priv->psr.psr2_support) {
+	if (dev_priv->psr.psr2_enabled) {
 		/* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
 		memset(&psr_vsc, 0, sizeof(psr_vsc));
 		psr_vsc.sdp_header.HB0 = 0;
@@ -265,7 +266,7 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 
 	/* Enable ALPM at sink for psr2 */
-	if (dev_priv->psr.psr2_support && dev_priv->psr.alpm)
+	if (dev_priv->psr.psr2_enabled && dev_priv->psr.alpm)
 		drm_dp_dpcd_writeb(&intel_dp->aux,
 				DP_RECEIVER_ALPM_CONFIG,
 				DP_ALPM_ENABLE);
@@ -424,7 +425,7 @@ static void hsw_psr_activate(struct intel_dp *intel_dp)
 	 */
 
 	/* psr1 and psr2 are mutually exclusive.*/
-	if (dev_priv->psr.psr2_support)
+	if (dev_priv->psr.psr2_enabled)
 		hsw_activate_psr2(intel_dp);
 	else
 		hsw_activate_psr1(intel_dp);
@@ -444,7 +445,7 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 	 * dynamically during PSR enable, and extracted from sink
 	 * caps during eDP detection.
 	 */
-	if (!dev_priv->psr.psr2_support)
+	if (!dev_priv->psr.sink_psr2_support)
 		return false;
 
 	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
@@ -543,7 +544,7 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
 	struct drm_device *dev = intel_dig_port->base.base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 
-	if (dev_priv->psr.psr2_support)
+	if (dev_priv->psr.psr2_enabled)
 		WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
 	else
 		WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
@@ -570,7 +571,7 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
 	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 		hsw_psr_setup_aux(intel_dp);
 
-	if (dev_priv->psr.psr2_support) {
+	if (dev_priv->psr.psr2_enabled) {
 		u32 chicken = I915_READ(CHICKEN_TRANS(cpu_transcoder));
 
 		if (INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv))
@@ -629,7 +630,7 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 		goto unlock;
 	}
 
-	dev_priv->psr.psr2_support = crtc_state->has_psr2;
+	dev_priv->psr.psr2_enabled = crtc_state->has_psr2;
 	dev_priv->psr.busy_frontbuffer_bits = 0;
 
 	dev_priv->psr.setup_vsc(intel_dp, crtc_state);
@@ -699,7 +700,7 @@ static void hsw_psr_disable(struct intel_dp *intel_dp,
 		i915_reg_t psr_status;
 		u32 psr_status_mask;
 
-		if (dev_priv->psr.psr2_support) {
+		if (dev_priv->psr.psr2_enabled) {
 			psr_status = EDP_PSR2_STATUS;
 			psr_status_mask = EDP_PSR2_STATUS_STATE_MASK;
 
@@ -723,7 +724,7 @@ static void hsw_psr_disable(struct intel_dp *intel_dp,
 
 		dev_priv->psr.active = false;
 	} else {
-		if (dev_priv->psr.psr2_support)
+		if (dev_priv->psr.psr2_enabled)
 			WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
 		else
 			WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
@@ -783,7 +784,7 @@ static void intel_psr_work(struct work_struct *work)
 	 * and be ready for re-enable.
 	 */
 	if (HAS_DDI(dev_priv)) {
-		if (dev_priv->psr.psr2_support) {
+		if (dev_priv->psr.psr2_enabled) {
 			if (intel_wait_for_register(dev_priv,
 						    EDP_PSR2_STATUS,
 						    EDP_PSR2_STATUS_STATE_MASK,
@@ -842,7 +843,7 @@ static void intel_psr_exit(struct drm_i915_private *dev_priv)
 		return;
 
 	if (HAS_DDI(dev_priv)) {
-		if (dev_priv->psr.psr2_support) {
+		if (dev_priv->psr.psr2_enabled) {
 			val = I915_READ(EDP_PSR2_CTL);
 			WARN_ON(!(val & EDP_PSR2_ENABLE));
 			I915_WRITE(EDP_PSR2_CTL, val & ~EDP_PSR2_ENABLE);
@@ -1011,7 +1012,7 @@ void intel_psr_flush(struct drm_i915_private *dev_priv,
 
 	/* By definition flush = invalidate + flush */
 	if (frontbuffer_bits) {
-		if (dev_priv->psr.psr2_support ||
+		if (dev_priv->psr.psr2_enabled ||
 		    IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 			intel_psr_exit(dev_priv);
 		} else {