Re: [PATCH 2/2] drm/msm/dpu: remove CRTC frame event callback registration

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On 1/2/2023 7:47 AM, Dmitry Baryshkov wrote:
The frame event callback is always set to dpu_crtc_frame_event_cb() (or
to NULL) and the data is always either the CRTC itself or NULL
(correpondingly). Thus drop the event callback registration, call the
dpu_crtc_frame_event_cb() directly and gate on the dpu_enc->crtc
assigned using dpu_encoder_assign_crtc().

I suggest you wait till we sort out the PSR series for this, especially this patch https://patchwork.freedesktop.org/patch/515787/

There is going to be some change in this code when PSR is pushed again sometime early next week because PSR will touch the crtc assignment code (dpu_enc->crtc),

Based on how we all like that patch, we can get back to this one as this one is a minor cleanup.


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 17 +--------
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    | 14 +++++++
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 41 +++------------------
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 10 -----
  drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h   |  4 --
  5 files changed, 21 insertions(+), 65 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 13ce321283ff..64cd2ec8a0c4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -640,18 +640,8 @@ static void dpu_crtc_frame_event_work(struct kthread_work *work)
  	DPU_ATRACE_END("crtc_frame_event");
  }
-/*
- * dpu_crtc_frame_event_cb - crtc frame event callback API. CRTC module
- * registers this API to encoder for all frame event callbacks like
- * frame_error, frame_done, idle_timeout, etc. Encoder may call different events
- * from different context - IRQ, user thread, commit_thread, etc. Each event
- * should be carefully reviewed and should be processed in proper task context
- * to avoid schedulin delay or properly manage the irq context's bottom half
- * processing.
- */
-static void dpu_crtc_frame_event_cb(void *data, u32 event)
+void dpu_crtc_frame_event_cb(struct drm_crtc *crtc, u32 event)
  {
-	struct drm_crtc *crtc = (struct drm_crtc *)data;
  	struct dpu_crtc *dpu_crtc;
  	struct msm_drm_private *priv;
  	struct dpu_crtc_frame_event *fevent;
@@ -1051,9 +1041,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
dpu_core_perf_crtc_update(crtc, 0, true); - drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
-		dpu_encoder_register_frame_event_callback(encoder, NULL, NULL);
-
  	memset(cstate->mixers, 0, sizeof(cstate->mixers));
  	cstate->num_mixers = 0;
@@ -1089,8 +1076,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
  		 */
  		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
  			request_bandwidth = true;
-		dpu_encoder_register_frame_event_callback(encoder,
-				dpu_crtc_frame_event_cb, (void *)crtc);
  	}
if (request_bandwidth)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index 539b68b1626a..3aa536d95721 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -300,4 +300,18 @@ static inline enum dpu_crtc_client_type dpu_crtc_get_client_type(
  	return crtc && crtc->state ? RT_CLIENT : NRT_CLIENT;
  }
+/**
+ * dpu_crtc_frame_event_cb - crtc frame event callback API
+ * @crtc: Pointer to crtc
+ * @event: Event to process
+ *
+ * CRTC module registers this API to encoder for all frame event callbacks like
+ * frame_error, frame_done, idle_timeout, etc. Encoder may call different events
+ * from different context - IRQ, user thread, commit_thread, etc. Each event
+ * should be carefully reviewed and should be processed in proper task context
+ * to avoid schedulin delay or properly manage the irq context's bottom half
+ * processing.
+ */
+void dpu_crtc_frame_event_cb(struct drm_crtc *crtc, u32 event);
+
  #endif /* _DPU_CRTC_H_ */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 84f8c8a1b049..bf0af5af4306 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -147,8 +147,6 @@ enum dpu_enc_rc_states {
   * @frame_busy_mask:		Bitmask tracking which phys_enc we are still
   *				busy processing current command.
   *				Bit0 = phys_encs[0] etc.
- * @crtc_frame_event_cb:	callback handler for frame event
- * @crtc_frame_event_cb_data:	callback handler private data
   * @frame_done_timeout_ms:	frame done timeout in ms
   * @frame_done_timer:		watchdog timer for frame done event
   * @vsync_event_timer:		vsync timer
@@ -187,8 +185,6 @@ struct dpu_encoder_virt {
  	struct dentry *debugfs_root;
  	struct mutex enc_lock;
  	DECLARE_BITMAP(frame_busy_mask, MAX_PHYS_ENCODERS_PER_VIRTUAL);
-	void (*crtc_frame_event_cb)(void *, u32 event);
-	void *crtc_frame_event_cb_data;
atomic_t frame_done_timeout_ms;
  	struct timer_list frame_done_timer;
@@ -1358,28 +1354,6 @@ void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *drm_enc,
  	}
  }
-void dpu_encoder_register_frame_event_callback(struct drm_encoder *drm_enc,
-		void (*frame_event_cb)(void *, u32 event),
-		void *frame_event_cb_data)
-{
-	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
-	unsigned long lock_flags;
-	bool enable;
-
-	enable = frame_event_cb ? true : false;
-
-	if (!drm_enc) {
-		DPU_ERROR("invalid encoder\n");
-		return;
-	}
-	trace_dpu_enc_frame_event_cb(DRMID(drm_enc), enable);
-
-	spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
-	dpu_enc->crtc_frame_event_cb = frame_event_cb;
-	dpu_enc->crtc_frame_event_cb_data = frame_event_cb_data;
-	spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
-}
-
  void dpu_encoder_frame_done_callback(
  		struct drm_encoder *drm_enc,
  		struct dpu_encoder_phys *ready_phys, u32 event)
@@ -1418,15 +1392,12 @@ void dpu_encoder_frame_done_callback(
  			dpu_encoder_resource_control(drm_enc,
  					DPU_ENC_RC_EVENT_FRAME_DONE);
- if (dpu_enc->crtc_frame_event_cb)
-				dpu_enc->crtc_frame_event_cb(
-					dpu_enc->crtc_frame_event_cb_data,
-					event);
+			if (dpu_enc->crtc)
+				dpu_crtc_frame_event_cb(dpu_enc->crtc, event);
  		}
  	} else {
-		if (dpu_enc->crtc_frame_event_cb)
-			dpu_enc->crtc_frame_event_cb(
-				dpu_enc->crtc_frame_event_cb_data, event);
+		if (dpu_enc->crtc)
+			dpu_crtc_frame_event_cb(dpu_enc->crtc, event);
  	}
  }
@@ -2367,7 +2338,7 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
  		return;
  	}
- if (!dpu_enc->frame_busy_mask[0] || !dpu_enc->crtc_frame_event_cb) {
+	if (!dpu_enc->frame_busy_mask[0] || !dpu_enc->crtc) {
  		DRM_DEBUG_KMS("id:%u invalid timeout frame_busy_mask=%lu\n",
  			      DRMID(drm_enc), dpu_enc->frame_busy_mask[0]);
  		return;
@@ -2380,7 +2351,7 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
event = DPU_ENCODER_FRAME_EVENT_ERROR;
  	trace_dpu_enc_frame_done_timeout(DRMID(drm_enc), event);
-	dpu_enc->crtc_frame_event_cb(dpu_enc->crtc_frame_event_cb_data, event);
+	dpu_crtc_frame_event_cb(dpu_enc->crtc, event);
  }
static const struct drm_encoder_helper_funcs dpu_encoder_helper_funcs = {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 9e7236ef34e6..dd9cff4f1606 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -57,16 +57,6 @@ void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
  void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *encoder,
  					struct drm_crtc *crtc, bool enable);
-/**
- * dpu_encoder_register_frame_event_callback - provide callback to encoder that
- *	will be called after the request is complete, or other events.
- * @encoder:	encoder pointer
- * @cb:		callback pointer, provide NULL to deregister
- * @data:	user data provided to callback
- */
-void dpu_encoder_register_frame_event_callback(struct drm_encoder *encoder,
-		void (*cb)(void *, u32), void *data);
-
  /**
   * dpu_encoder_prepare_for_kickoff - schedule double buffer flip of the ctl
   *	path (i.e. ctl flush and start) at next appropriate time.
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
index 76169f406505..c75b4363bfc6 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
@@ -346,10 +346,6 @@ DEFINE_EVENT(dpu_enc_id_enable_template, dpu_enc_vblank_cb,
  	TP_PROTO(uint32_t drm_id, bool enable),
  	TP_ARGS(drm_id, enable)
  );
-DEFINE_EVENT(dpu_enc_id_enable_template, dpu_enc_frame_event_cb,
-	TP_PROTO(uint32_t drm_id, bool enable),
-	TP_ARGS(drm_id, enable)
-);
  DEFINE_EVENT(dpu_enc_id_enable_template, dpu_enc_phys_cmd_connect_te,
  	TP_PROTO(uint32_t drm_id, bool enable),
  	TP_ARGS(drm_id, enable)



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