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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Sun, 25 Feb 2024 16:12:47 +0200
Subject: [PATCH v3 2/3] drm/msm/dpu: split dpu_encoder_wait_for_event into
 two functions
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Message-Id: <20240225-fd-dpu-debug-timeout-v3-2-252f2b21cdcc@linaro.org>
References: <20240225-fd-dpu-debug-timeout-v3-0-252f2b21cdcc@linaro.org>
In-Reply-To: <20240225-fd-dpu-debug-timeout-v3-0-252f2b21cdcc@linaro.org>
To: Rob Clark <robdclark@gmail.com>, 
 Abhinav Kumar <quic_abhinavk@quicinc.com>, Sean Paul <sean@poorly.run>, 
 Marijn Suijten <marijn.suijten@somainline.org>, 
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>
Cc: Steev Klimaszewski <steev@kali.org>, linux-arm-msm@vger.kernel.org, 
 dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, 
 linux-kernel@vger.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Stop multiplexing several events via the dpu_encoder_wait_for_event()
function. Split it into two distinct functions two allow separate
handling of those events.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 74 +++++++++++++++++++++--------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 22 ++-------
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     |  2 +-
 drivers/gpu/drm/msm/msm_drv.h               | 10 ----
 4 files changed, 59 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 194dbb08331d..30f349c8a1e5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1282,7 +1282,7 @@ static void dpu_encoder_virt_atomic_disable(struct drm_encoder *drm_enc,
 	trace_dpu_enc_disable(DRMID(drm_enc));
 
 	/* wait for idle */
-	dpu_encoder_wait_for_event(drm_enc, MSM_ENC_TX_COMPLETE);
+	dpu_encoder_wait_for_tx_complete(drm_enc);
 
 	dpu_encoder_resource_control(drm_enc, DPU_ENC_RC_EVENT_PRE_STOP);
 
@@ -2402,10 +2402,23 @@ struct drm_encoder *dpu_encoder_init(struct drm_device *dev,
 	return &dpu_enc->base;
 }
 
-int dpu_encoder_wait_for_event(struct drm_encoder *drm_enc,
-	enum msm_event_wait event)
+/**
+ * dpu_encoder_wait_for_commit_done() - Wait for encoder to flush pending state
+ * @drm_enc:	encoder pointer
+ *
+ * Wait for hardware to have flushed the current pending frames to hardware at
+ * a vblank or ctl_start Encoders will map this differently depending on the
+ * panel type.
+ *
+ * MSM_ENC_TX_COMPLETE -  Wait for the hardware to transfer all the pixels to
+ *                        the panel. Encoders will map this differently
+ *                        depending on the panel type.
+ *                        vid mode -> vsync_irq
+ *                        cmd mode -> pp_done
+ * Return: 0 on success, -EWOULDBLOCK if already signaled, error otherwise
+ */
+int dpu_encoder_wait_for_commit_done(struct drm_encoder *drm_enc)
 {
-	int (*fn_wait)(struct dpu_encoder_phys *phys_enc) = NULL;
 	struct dpu_encoder_virt *dpu_enc = NULL;
 	int i, ret = 0;
 
@@ -2419,23 +2432,46 @@ int dpu_encoder_wait_for_event(struct drm_encoder *drm_enc,
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
 		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
 
-		switch (event) {
-		case MSM_ENC_COMMIT_DONE:
-			fn_wait = phys->ops.wait_for_commit_done;
-			break;
-		case MSM_ENC_TX_COMPLETE:
-			fn_wait = phys->ops.wait_for_tx_complete;
-			break;
-		default:
-			DPU_ERROR_ENC(dpu_enc, "unknown wait event %d\n",
-					event);
-			return -EINVAL;
+		if (phys->ops.wait_for_commit_done) {
+			DPU_ATRACE_BEGIN("wait_for_commit_done");
+			ret = phys->ops.wait_for_commit_done(phys);
+			DPU_ATRACE_END("wait_for_commit_done");
+			if (ret)
+				return ret;
 		}
+	}
+
+	return ret;
+}
+
+/**
+ * dpu_encoder_wait_for_tx_complete() - Wait for encoder to transfer pixels to panel
+ * @drm_enc:	encoder pointer
+ *
+ * Wait for the hardware to transfer all the pixels to the panel. Encoders will
+ * map this differently depending on the panel type.
+ *
+ * Return: 0 on success, -EWOULDBLOCK if already signaled, error otherwise
+ */
+int dpu_encoder_wait_for_tx_complete(struct drm_encoder *drm_enc)
+{
+	struct dpu_encoder_virt *dpu_enc = NULL;
+	int i, ret = 0;
+
+	if (!drm_enc) {
+		DPU_ERROR("invalid encoder\n");
+		return -EINVAL;
+	}
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+	DPU_DEBUG_ENC(dpu_enc, "\n");
+
+	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
+		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
 
-		if (fn_wait) {
-			DPU_ATRACE_BEGIN("wait_for_completion_event");
-			ret = fn_wait(phys);
-			DPU_ATRACE_END("wait_for_completion_event");
+		if (phys->ops.wait_for_tx_complete) {
+			DPU_ATRACE_BEGIN("wait_for_tx_complete");
+			ret = phys->ops.wait_for_tx_complete(phys);
+			DPU_ATRACE_END("wait_for_tx_complete");
 			if (ret)
 				return ret;
 		}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index fe6b1d312a74..0c928d1876e4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -93,25 +93,9 @@ void dpu_encoder_kickoff(struct drm_encoder *encoder);
  */
 int dpu_encoder_vsync_time(struct drm_encoder *drm_enc, ktime_t *wakeup_time);
 
-/**
- * dpu_encoder_wait_for_event - Waits for encoder events
- * @encoder:	encoder pointer
- * @event:      event to wait for
- * MSM_ENC_COMMIT_DONE -  Wait for hardware to have flushed the current pending
- *                        frames to hardware at a vblank or ctl_start
- *                        Encoders will map this differently depending on the
- *                        panel type.
- *	                  vid mode -> vsync_irq
- *                        cmd mode -> ctl_start
- * MSM_ENC_TX_COMPLETE -  Wait for the hardware to transfer all the pixels to
- *                        the panel. Encoders will map this differently
- *                        depending on the panel type.
- *                        vid mode -> vsync_irq
- *                        cmd mode -> pp_done
- * Returns: 0 on success, -EWOULDBLOCK if already signaled, error otherwise
- */
-int dpu_encoder_wait_for_event(struct drm_encoder *drm_encoder,
-						enum msm_event_wait event);
+int dpu_encoder_wait_for_commit_done(struct drm_encoder *drm_encoder);
+
+int dpu_encoder_wait_for_tx_complete(struct drm_encoder *drm_encoder);
 
 /*
  * dpu_encoder_get_intf_mode - get interface mode of the given encoder
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index d6412395bacc..26b5e54031d9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -476,7 +476,7 @@ static void dpu_kms_wait_for_commit_done(struct msm_kms *kms,
 		 * mode panels. This may be a no-op for command mode panels.
 		 */
 		trace_dpu_kms_wait_for_commit_done(DRMID(crtc));
-		ret = dpu_encoder_wait_for_event(encoder, MSM_ENC_COMMIT_DONE);
+		ret = dpu_encoder_wait_for_commit_done(encoder);
 		if (ret && ret != -EWOULDBLOCK) {
 			DPU_ERROR("wait for commit done returned %d\n", ret);
 			break;
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 762e13e2df74..91cf57f72321 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -74,16 +74,6 @@ enum msm_dsi_controller {
 #define MSM_GPU_MAX_RINGS 4
 #define MAX_H_TILES_PER_DISPLAY 2
 
-/**
- * enum msm_event_wait - type of HW events to wait for
- * @MSM_ENC_COMMIT_DONE - wait for the driver to flush the registers to HW
- * @MSM_ENC_TX_COMPLETE - wait for the HW to transfer the frame to panel
- */
-enum msm_event_wait {
-	MSM_ENC_COMMIT_DONE = 0,
-	MSM_ENC_TX_COMPLETE,
-};
-
 /**
  * struct msm_display_topology - defines a display topology pipeline
  * @num_lm:       number of layer mixers used

-- 
2.39.2