[PATCH 2/2] drm/msm: dpu: Make legacy cursor updates asynchronous

[Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>]

From: Sean Paul <seanpaul@chromium.org>

This patch sprinkles a few async/legacy_cursor_update checks
through commit to ensure that cursor updates aren't blocked on vsync.
There are 2 main components to this, the first is that we don't want to
wait_for_commit_done in msm_atomic  before returning from atomic_complete.
The second is that in dpu we don't want to wait for frame_done events when
updating the cursor.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 44 +++++++++++----------
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    |  3 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 21 ++++++----
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  6 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     |  5 ++-
 drivers/gpu/drm/msm/msm_atomic.c            |  3 +-
 6 files changed, 48 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index a8f2dd7a37c7..b23f00a2554b 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -816,7 +816,7 @@ static int _dpu_crtc_wait_for_frame_done(struct drm_crtc *crtc)
 	return rc;
 }
 
-void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
+void dpu_crtc_commit_kickoff(struct drm_crtc *crtc, bool async)
 {
 	struct drm_encoder *encoder;
 	struct drm_device *dev;
@@ -862,27 +862,30 @@ void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
 		 * Encoder will flush/start now, unless it has a tx pending.
 		 * If so, it may delay and flush at an irq event (e.g. ppdone)
 		 */
-		dpu_encoder_prepare_for_kickoff(encoder, &params);
+		dpu_encoder_prepare_for_kickoff(encoder, &params, async);
 	}
 
-	/* wait for frame_event_done completion */
-	DPU_ATRACE_BEGIN("wait_for_frame_done_event");
-	ret = _dpu_crtc_wait_for_frame_done(crtc);
-	DPU_ATRACE_END("wait_for_frame_done_event");
-	if (ret) {
-		DPU_ERROR("crtc%d wait for frame done failed;frame_pending%d\n",
-				crtc->base.id,
-				atomic_read(&dpu_crtc->frame_pending));
-		goto end;
-	}
 
-	if (atomic_inc_return(&dpu_crtc->frame_pending) == 1) {
-		/* acquire bandwidth and other resources */
-		DPU_DEBUG("crtc%d first commit\n", crtc->base.id);
-	} else
-		DPU_DEBUG("crtc%d commit\n", crtc->base.id);
+	if (!async) {
+		/* wait for frame_event_done completion */
+		DPU_ATRACE_BEGIN("wait_for_frame_done_event");
+		ret = _dpu_crtc_wait_for_frame_done(crtc);
+		DPU_ATRACE_END("wait_for_frame_done_event");
+		if (ret) {
+			DPU_ERROR("crtc%d wait for frame done failed;frame_pending%d\n",
+					crtc->base.id,
+					atomic_read(&dpu_crtc->frame_pending));
+			goto end;
+		}
+
+		if (atomic_inc_return(&dpu_crtc->frame_pending) == 1) {
+			/* acquire bandwidth and other resources */
+			DPU_DEBUG("crtc%d first commit\n", crtc->base.id);
+		} else
+			DPU_DEBUG("crtc%d commit\n", crtc->base.id);
 
-	dpu_crtc->play_count++;
+		dpu_crtc->play_count++;
+	}
 
 	dpu_vbif_clear_errors(dpu_kms);
 
@@ -890,11 +893,12 @@ void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
 		if (encoder->crtc != crtc)
 			continue;
 
-		dpu_encoder_kickoff(encoder);
+		dpu_encoder_kickoff(encoder, async);
 	}
 
 end:
-	reinit_completion(&dpu_crtc->frame_done_comp);
+	if (!async)
+		reinit_completion(&dpu_crtc->frame_done_comp);
 	DPU_ATRACE_END("crtc_commit");
 }
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index 3723b4830335..67c9f59997cf 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -285,8 +285,9 @@ int dpu_crtc_vblank(struct drm_crtc *crtc, bool en);
 /**
  * dpu_crtc_commit_kickoff - trigger kickoff of the commit for this crtc
  * @crtc: Pointer to drm crtc object
+ * @async: true if the commit is asynchronous, false otherwise
  */
-void dpu_crtc_commit_kickoff(struct drm_crtc *crtc);
+void dpu_crtc_commit_kickoff(struct drm_crtc *crtc, bool async);
 
 /**
  * dpu_crtc_complete_commit - callback signalling completion of current commit
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index c2e8985b4c54..fc729fc8dd8c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1410,7 +1410,7 @@ static void dpu_encoder_off_work(struct kthread_work *work)
  * extra_flush_bits: Additional bit mask to include in flush trigger
  */
 static inline void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
-		struct dpu_encoder_phys *phys, uint32_t extra_flush_bits)
+		struct dpu_encoder_phys *phys, uint32_t extra_flush_bits, bool async)
 {
 	struct dpu_hw_ctl *ctl;
 	int pending_kickoff_cnt;
@@ -1433,7 +1433,10 @@ static inline void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
 		return;
 	}
 
-	pending_kickoff_cnt = dpu_encoder_phys_inc_pending(phys);
+	if (!async)
+		pending_kickoff_cnt = dpu_encoder_phys_inc_pending(phys);
+	else
+		pending_kickoff_cnt = atomic_read(&phys->pending_kickoff_cnt);
 
 	if (extra_flush_bits && ctl->ops.update_pending_flush)
 		ctl->ops.update_pending_flush(ctl, extra_flush_bits);
@@ -1545,7 +1548,8 @@ void dpu_encoder_helper_hw_reset(struct dpu_encoder_phys *phys_enc)
  *	a time.
  * dpu_enc: Pointer to virtual encoder structure
  */
-static void _dpu_encoder_kickoff_phys(struct dpu_encoder_virt *dpu_enc)
+static void _dpu_encoder_kickoff_phys(struct dpu_encoder_virt *dpu_enc,
+				      bool async)
 {
 	struct dpu_hw_ctl *ctl;
 	uint32_t i, pending_flush;
@@ -1576,7 +1580,8 @@ static void _dpu_encoder_kickoff_phys(struct dpu_encoder_virt *dpu_enc)
 			set_bit(i, dpu_enc->frame_busy_mask);
 		if (!phys->ops.needs_single_flush ||
 				!phys->ops.needs_single_flush(phys))
-			_dpu_encoder_trigger_flush(&dpu_enc->base, phys, 0x0);
+			_dpu_encoder_trigger_flush(&dpu_enc->base, phys, 0x0,
+						   async);
 		else if (ctl->ops.get_pending_flush)
 			pending_flush |= ctl->ops.get_pending_flush(ctl);
 	}
@@ -1586,7 +1591,7 @@ static void _dpu_encoder_kickoff_phys(struct dpu_encoder_virt *dpu_enc)
 		_dpu_encoder_trigger_flush(
 				&dpu_enc->base,
 				dpu_enc->cur_master,
-				pending_flush);
+				pending_flush, async);
 	}
 
 	_dpu_encoder_trigger_start(dpu_enc->cur_master);
@@ -1770,7 +1775,7 @@ static void dpu_encoder_vsync_event_work_handler(struct kthread_work *work)
 }
 
 void dpu_encoder_prepare_for_kickoff(struct drm_encoder *drm_enc,
-		struct dpu_encoder_kickoff_params *params)
+		struct dpu_encoder_kickoff_params *params, bool async)
 {
 	struct dpu_encoder_virt *dpu_enc;
 	struct dpu_encoder_phys *phys;
@@ -1811,7 +1816,7 @@ void dpu_encoder_prepare_for_kickoff(struct drm_encoder *drm_enc,
 	}
 }
 
-void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
+void dpu_encoder_kickoff(struct drm_encoder *drm_enc, bool async)
 {
 	struct dpu_encoder_virt *dpu_enc;
 	struct dpu_encoder_phys *phys;
@@ -1834,7 +1839,7 @@ void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
 		((atomic_read(&dpu_enc->frame_done_timeout) * HZ) / 1000));
 
 	/* All phys encs are ready to go, trigger the kickoff */
-	_dpu_encoder_kickoff_phys(dpu_enc);
+	_dpu_encoder_kickoff_phys(dpu_enc, async);
 
 	/* allow phys encs to handle any post-kickoff business */
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 9dbf38f446d9..c2044122d609 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -81,9 +81,10 @@ void dpu_encoder_register_frame_event_callback(struct drm_encoder *encoder,
  *	Delayed: Block until next trigger can be issued.
  * @encoder:	encoder pointer
  * @params:	kickoff time parameters
+ * @async:	true if this is an asynchronous commit
  */
 void dpu_encoder_prepare_for_kickoff(struct drm_encoder *encoder,
-		struct dpu_encoder_kickoff_params *params);
+		struct dpu_encoder_kickoff_params *params, bool async);
 
 /**
  * dpu_encoder_trigger_kickoff_pending - Clear the flush bits from previous
@@ -96,8 +97,9 @@ void dpu_encoder_trigger_kickoff_pending(struct drm_encoder *encoder);
  * dpu_encoder_kickoff - trigger a double buffer flip of the ctl path
  *	(i.e. ctl flush and start) immediately.
  * @encoder:	encoder pointer
+ * @async:	true if this is an asynchronous commit
  */
-void dpu_encoder_kickoff(struct drm_encoder *encoder);
+void dpu_encoder_kickoff(struct drm_encoder *encoder, bool async);
 
 /**
  * dpu_encoder_wait_for_event - Waits for encoder events
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 0a683e65a9f3..1cba21edd862 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -352,7 +352,7 @@ void dpu_kms_encoder_enable(struct drm_encoder *encoder)
 
 	if (crtc && crtc->state->active) {
 		trace_dpu_kms_enc_enable(DRMID(crtc));
-		dpu_crtc_commit_kickoff(crtc);
+		dpu_crtc_commit_kickoff(crtc, false);
 	}
 }
 
@@ -369,7 +369,8 @@ static void dpu_kms_commit(struct msm_kms *kms, struct drm_atomic_state *state)
 
 		if (crtc->state->active) {
 			trace_dpu_kms_commit(DRMID(crtc));
-			dpu_crtc_commit_kickoff(crtc);
+			dpu_crtc_commit_kickoff(crtc,
+						state->legacy_cursor_update);
 		}
 	}
 }
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index c1f1779c980f..7912130ce5ce 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -76,7 +76,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
 		kms->funcs->commit(kms, state);
 	}
 
-	msm_atomic_wait_for_commit_done(dev, state);
+	if (!state->legacy_cursor_update)
+		msm_atomic_wait_for_commit_done(dev, state);
 
 	kms->funcs->complete_commit(kms, state);
 
-- 
Sean Paul, Software Engineer, Google / Chromium OS

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