[PATCH v3 20/23] drm/msm/dpu: Start frame done timer after encoder kickoff

[Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>]

Starting the frame done timer before the encoder is finished kicking off
can lead to unnecessary frame done timeouts when the device is
experiencing heavy load (ex. when debug logs are enabled).

Thus, create a separate API for starting the encoder frame done timer and
call it after the encoder kickoff is finished

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  4 +++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 25 ++++++++++++++++++-------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  4 +++-
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index b156175c81898d5c0b5dc4692bf44fa74dffa574..22d135c8c8be498533b6730fbd0077628b846989 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -970,8 +970,10 @@ void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
 
 	dpu_vbif_clear_errors(dpu_kms);
 
-	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
+	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask) {
 		dpu_encoder_kickoff(encoder);
+		dpu_encoder_start_frame_done_timer(encoder);
+	}
 
 	reinit_completion(&dpu_crtc->frame_done_comp);
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 7d2ebbb4f20d3c4ca588ff227e398387887b22f8..7e00fabe1327d753c00327870dfdbab4eb587754 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1941,18 +1941,16 @@ bool dpu_encoder_is_valid_for_commit(struct drm_encoder *drm_enc)
 	return true;
 }
 
-void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
+/**
+ * dpu_encoder_start_frame_done_timer - Start the encoder frame done timer
+ * @drm_enc: Pointer to drm encoder structure
+ */
+void dpu_encoder_start_frame_done_timer(struct drm_encoder *drm_enc)
 {
 	struct dpu_encoder_virt *dpu_enc;
-	struct dpu_encoder_phys *phys;
 	unsigned long timeout_ms;
-	unsigned int i;
 
-	DPU_ATRACE_BEGIN("encoder_kickoff");
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
-
-	trace_dpu_enc_kickoff(DRMID(drm_enc));
-
 	timeout_ms = DPU_ENCODER_FRAME_DONE_TIMEOUT_FRAMES * 1000 /
 			drm_mode_vrefresh(&drm_enc->crtc->state->adjusted_mode);
 
@@ -1960,6 +1958,19 @@ void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
 	mod_timer(&dpu_enc->frame_done_timer,
 			jiffies + msecs_to_jiffies(timeout_ms));
 
+}
+
+void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
+{
+	struct dpu_encoder_virt *dpu_enc;
+	struct dpu_encoder_phys *phys;
+	unsigned int i;
+
+	DPU_ATRACE_BEGIN("encoder_kickoff");
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+
+	trace_dpu_enc_kickoff(DRMID(drm_enc));
+
 	/* All phys encs are ready to go, trigger the kickoff */
 	_dpu_encoder_kickoff_phys(dpu_enc);
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 0d27e50384f049e21d4b5b5258d77d3ec7976c13..deaa0463b289fd12eaa0bb4179c58d04425007a6 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@xxxxxxxxx>
@@ -210,4 +210,6 @@ void dpu_encoder_cleanup_wb_job(struct drm_encoder *drm_enc,
  */
 bool dpu_encoder_is_valid_for_commit(struct drm_encoder *drm_enc);
 
+void dpu_encoder_start_frame_done_timer(struct drm_encoder *drm_enc);
+
 #endif /* __DPU_ENCODER_H__ */

-- 
2.34.1