[Intel-gfx] [PATCH] drm/i915/psr: Print PSR_STATUS when PSR idle wait times out.

[Dhinakaran Pandiyan]

Knowing the status of the PSR HW state machine is useful for debug,
especially since we are seeing errors with PSR2 in CI.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h    | 3 ++-
 drivers/gpu/drm/i915/intel_psr.c    | 9 ++++++---
 drivers/gpu/drm/i915/intel_sprite.c | 6 ++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c275f91244a6..658411680683 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1938,7 +1938,8 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 void intel_psr_irq_control(struct drm_i915_private *dev_priv, bool debug);
 void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir);
 void intel_psr_short_pulse(struct intel_dp *intel_dp);
-int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state);
+int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state,
+			    u32 *out_value);
 
 /* intel_runtime_pm.c */
 int intel_power_domains_init(struct drm_i915_private *);
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 4bd5768731ee..5686ddaa6a72 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -717,7 +717,8 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 	cancel_work_sync(&dev_priv->psr.work);
 }
 
-int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state)
+int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state,
+			    u32 *out_value)
 {
 	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->base.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -750,8 +751,10 @@ int intel_psr_wait_for_idle(const struct intel_crtc_state *new_crtc_state)
 	 * 6 ms of exit training time + 1.5 ms of aux channel
 	 * handshake. 50 msec is defesive enough to cover everything.
 	 */
-	return intel_wait_for_register(dev_priv, reg, mask,
-				       EDP_PSR_STATUS_STATE_IDLE, 50);
+
+	return __intel_wait_for_register(dev_priv, reg, mask,
+					 EDP_PSR_STATUS_STATE_IDLE, 2, 50,
+					 out_value);
 }
 
 static bool __psr_wait_for_idle_locked(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index f7026e887fa9..774bfb03c5d9 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -83,6 +83,7 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	bool need_vlv_dsi_wa = (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
 		intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI);
 	DEFINE_WAIT(wait);
+	u32 psr_status;
 
 	vblank_start = adjusted_mode->crtc_vblank_start;
 	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
@@ -104,8 +105,9 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	 * VBL interrupts will start the PSR exit and prevent a PSR
 	 * re-entry as well.
 	 */
-	if (intel_psr_wait_for_idle(new_crtc_state))
-		DRM_ERROR("PSR idle timed out, atomic update may fail\n");
+	if (intel_psr_wait_for_idle(new_crtc_state, &psr_status))
+		DRM_ERROR("PSR idle timed out 0x%x, atomic update may fail\n",
+			  psr_status);
 
 	local_irq_disable();
 
-- 
2.17.1