[PATCH v2 20/22] drm/msm/dpu: Skip trigger flush and start for CWB

[Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>]

For concurrent writeback, the real time encoder is responsible for
trigger flush and trigger start. Return early for trigger start and
trigger flush for the concurrent writeback encoders.

Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index ac3ff13b65c3..87eaaf1196c2 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1488,6 +1488,7 @@ static void dpu_encoder_off_work(struct work_struct *work)
 static void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
 		struct dpu_encoder_phys *phys, uint32_t extra_flush_bits)
 {
+	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
 	struct dpu_hw_ctl *ctl;
 	int pending_kickoff_cnt;
 	u32 ret = UINT_MAX;
@@ -1505,6 +1506,15 @@ static void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
 
 	pending_kickoff_cnt = dpu_encoder_phys_inc_pending(phys);
 
+	/* Return early if encoder is writeback and in clone mode */
+	if (drm_enc->encoder_type == DRM_MODE_ENCODER_VIRTUAL &&
+	    dpu_enc->cwb_mask) {
+		DPU_DEBUG("encoder %d skip flush for concurrent writeback encoder\n",
+				DRMID(drm_enc));
+		return;
+	}
+
+
 	if (extra_flush_bits && ctl->ops.update_pending_flush)
 		ctl->ops.update_pending_flush(ctl, extra_flush_bits);
 
@@ -1527,6 +1537,8 @@ static void _dpu_encoder_trigger_flush(struct drm_encoder *drm_enc,
  */
 static void _dpu_encoder_trigger_start(struct dpu_encoder_phys *phys)
 {
+	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(phys->parent);
+
 	if (!phys) {
 		DPU_ERROR("invalid argument(s)\n");
 		return;
@@ -1537,6 +1549,12 @@ static void _dpu_encoder_trigger_start(struct dpu_encoder_phys *phys)
 		return;
 	}
 
+	if (phys->parent->encoder_type == DRM_MODE_ENCODER_VIRTUAL &&
+	    dpu_enc->cwb_mask) {
+		DPU_DEBUG("encoder %d CWB enabled, skipping\n", DRMID(phys->parent));
+		return;
+	}
+
 	if (phys->ops.trigger_start && phys->enable_state != DPU_ENC_DISABLED)
 		phys->ops.trigger_start(phys);
 }

-- 
2.34.1