Re: [PATCH v8 01/15] drm/msm/disp/dpu: clear dpu_assign_crtc and get crtc from connector state instead of dpu_enc

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On 12/10/2022 15:02, Vinod Polimera wrote:
Update crtc retrieval from dpu_enc to dpu_enc connector state,
since new links get set as part of the dpu enc virt mode set.
The dpu_enc->crtc cache is no more needed, hence cleaning it as
part of this change.

Signed-off-by: Vinod Polimera <quic_vpolimer@xxxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  4 ---
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 42 +++++++++--------------------
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  8 ------
  3 files changed, 13 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 13ce321..8ec9a13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
  		 */
  		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
  			release_bandwidth = true;
-		dpu_encoder_assign_crtc(encoder, NULL);
  	}
/* wait for frame_event_done completion */
@@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
  	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
  	dpu_crtc->enabled = true;
- drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
-		dpu_encoder_assign_crtc(encoder, crtc);
-
  	/* Enable/restore vblank irq handling */
  	drm_crtc_vblank_on(crtc);
  }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 9c6817b..d05b353 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -132,11 +132,6 @@ enum dpu_enc_rc_states {
   * @intfs_swapped:	Whether or not the phys_enc interfaces have been swapped
   *			for partial update right-only cases, such as pingpong
   *			split where virtual pingpong does not generate IRQs
- * @crtc:		Pointer to the currently assigned crtc. Normally you
- *			would use crtc->state->encoder_mask to determine the
- *			link between encoder/crtc. However in this case we need
- *			to track crtc in the disable() hook which is called
- *			_after_ encoder_mask is cleared.
   * @connector:		If a mode is set, cached pointer to the active connector
   * @crtc_kickoff_cb:		Callback into CRTC that will flush & start
   *				all CTL paths
@@ -181,7 +176,6 @@ struct dpu_encoder_virt {
bool intfs_swapped; - struct drm_crtc *crtc;
  	struct drm_connector *connector;
struct dentry *debugfs_root;
@@ -1288,7 +1282,7 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
  		struct dpu_encoder_phys *phy_enc)
  {
  	struct dpu_encoder_virt *dpu_enc = NULL;
-	unsigned long lock_flags;
+	struct drm_crtc *crtc;
if (!drm_enc || !phy_enc)
  		return;
@@ -1296,12 +1290,13 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
  	DPU_ATRACE_BEGIN("encoder_vblank_callback");
  	dpu_enc = to_dpu_encoder_virt(drm_enc);
- atomic_inc(&phy_enc->vsync_cnt);
+	if (!dpu_enc->connector || !dpu_enc->connector->state ||
+	    !dpu_enc->connector->state->crtc)
+		return;
- spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
-	if (dpu_enc->crtc)
-		dpu_crtc_vblank_callback(dpu_enc->crtc);
-	spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
+	atomic_inc(&phy_enc->vsync_cnt);
+	crtc = dpu_enc->connector->state->crtc;
+	dpu_crtc_vblank_callback(crtc);

So, what if the user commits the mode setting change on another CPU, while we are handling the vblank callback here? Can this happen?

DPU_ATRACE_END("encoder_vblank_callback");
  }
--
With best wishes
Dmitry




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