drm/msm/dpu: capture snapshot on the first commit_done timeout

[ Upstream commit 4be445f ]

In order to debug commit_done timeouts, capture the devcoredump state
when the first timeout occurs after the encoder has been enabled.

Reviewed-by: Abhinav Kumar <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/579850/
Link: https://lore.kernel.org/r/[email protected]
Stable-dep-of: aedf02e ("drm/msm/dpu: move dpu_encoder's connector assignment to atomic_enable()")
Signed-off-by: Sasha Levin <[email protected]>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -124,6 +124,8 @@ enum dpu_enc_rc_states {
  * @base:		drm_encoder base class for registration with DRM
  * @enc_spinlock:	Virtual-Encoder-Wide Spin Lock for IRQ purposes
  * @enabled:		True if the encoder is active, protected by enc_lock
+ * @commit_done_timedout: True if there has been a timeout on commit after
+ *			enabling the encoder.
  * @num_phys_encs:	Actual number of physical encoders contained.
  * @phys_encs:		Container of physical encoders managed.
  * @cur_master:		Pointer to the current master in this mode. Optimization
@@ -172,6 +174,7 @@ struct dpu_encoder_virt {
 	spinlock_t enc_spinlock;
 
 	bool enabled;
+	bool commit_done_timedout;
 
 	unsigned int num_phys_encs;
 	struct dpu_encoder_phys *phys_encs[MAX_PHYS_ENCODERS_PER_VIRTUAL];
@@ -1210,6 +1213,9 @@ static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
 	dpu_enc->dsc = dpu_encoder_get_dsc_config(drm_enc);
 
 	mutex_lock(&dpu_enc->enc_lock);
+
+	dpu_enc->commit_done_timedout = false;
+
 	cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
 
 	trace_dpu_enc_enable(DRMID(drm_enc), cur_mode->hdisplay,
@@ -2446,6 +2452,10 @@ int dpu_encoder_wait_for_commit_done(struct drm_encoder *drm_enc)
 			DPU_ATRACE_BEGIN("wait_for_commit_done");
 			ret = phys->ops.wait_for_commit_done(phys);
 			DPU_ATRACE_END("wait_for_commit_done");
+			if (ret == -ETIMEDOUT && !dpu_enc->commit_done_timedout) {
+				dpu_enc->commit_done_timedout = true;
+				msm_disp_snapshot_state(drm_enc->dev);
+			}
 			if (ret)
 				return ret;
 		}