[CI v2 4/9] drm/i915/psr: Avoid initializing PSR if there is no sink support.

[Dhinakaran Pandiyan]

DPCD read for the eDP is complete by the time intel_psr_init() is
called, which means we can avoid initializing PSR structures and state
if there is no sink support.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 5 +++++
 drivers/gpu/drm/i915/intel_psr.c    | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 910b4d46dcf9..d358f8c8a050 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2548,6 +2548,11 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
 		return 0;
 	}
 
+	if (!dev_priv->psr.sink_support) {
+		seq_puts(m, "PSR not supported by the panel\n");
+		return 0;
+	}
+
 	intel_runtime_pm_get(dev_priv);
 
 	mutex_lock(&dev_priv->psr.lock);
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 76339cf387cb..095e0a5a8574 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -503,6 +503,9 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 	if (!crtc_state->has_psr)
 		return;
 
+	if (WARN_ON(!CAN_PSR(dev_priv)))
+		return;
+
 	WARN_ON(dev_priv->drrs.dp);
 	mutex_lock(&dev_priv->psr.lock);
 	if (dev_priv->psr.enabled) {
@@ -633,6 +636,9 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 	if (!old_crtc_state->has_psr)
 		return;
 
+	if (WARN_ON(!CAN_PSR(dev_priv)))
+		return;
+
 	mutex_lock(&dev_priv->psr.lock);
 	if (!dev_priv->psr.enabled) {
 		mutex_unlock(&dev_priv->psr.lock);
@@ -913,6 +919,9 @@ void intel_psr_init(struct drm_i915_private *dev_priv)
 	dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
 		HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
 
+	if (!dev_priv->psr.sink_support)
+		return;
+
 	/* Per platform default: all disabled. */
 	if (i915_modparams.enable_psr == -1)
 		i915_modparams.enable_psr = 0;
-- 
2.11.0