drm/msm/dpu: add real wait_for_commit_done()

Just waiting for next vblank isn't ideal.. we should really be looking
at the hw FLUSH register value to know if there is still an in-progress
flush without stalling unnecessarily when there is no pending flush.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Rob Clark <robdclark@chromium.org>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 737fe96..7c73b09 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -526,6 +526,26 @@ static int dpu_encoder_phys_vid_wait_for_vblank(
        return _dpu_encoder_phys_vid_wait_for_vblank(phys_enc, true);
 }
 
+static int dpu_encoder_phys_vid_wait_for_commit_done(
+               struct dpu_encoder_phys *phys_enc)
+{
+       struct dpu_hw_ctl *hw_ctl = phys_enc->hw_ctl;
+       int ret;
+
+       if (!hw_ctl)
+               return 0;
+
+       ret = wait_event_timeout(phys_enc->pending_kickoff_wq,
+               (hw_ctl->ops.get_flush_register(hw_ctl) == 0),
+               msecs_to_jiffies(50));
+       if (ret <= 0) {
+               DPU_ERROR("vblank timeout\n");
+               return -ETIMEDOUT;
+       }
+
+       return 0;
+}
+
 static void dpu_encoder_phys_vid_prepare_for_kickoff(
                struct dpu_encoder_phys *phys_enc)
 {
@@ -676,7 +696,7 @@ static void dpu_encoder_phys_vid_init_ops(struct dpu_encoder_phys_ops *ops)
        ops->destroy = dpu_encoder_phys_vid_destroy;
        ops->get_hw_resources = dpu_encoder_phys_vid_get_hw_resources;
        ops->control_vblank_irq = dpu_encoder_phys_vid_control_vblank_irq;
-       ops->wait_for_commit_done = dpu_encoder_phys_vid_wait_for_vblank;
+       ops->wait_for_commit_done = dpu_encoder_phys_vid_wait_for_commit_done;
        ops->wait_for_vblank = dpu_encoder_phys_vid_wait_for_vblank;
        ops->wait_for_tx_complete = dpu_encoder_phys_vid_wait_for_vblank;
        ops->irq_control = dpu_encoder_phys_vid_irq_control;