| Message ID | 20240106-fd-dpu-debug-timeout-v1-1-6d9762884641@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | drm/msm/dpu: make "vblank timeout" more useful | expand |
On 1/5/2024 3:50 PM, Dmitry Baryshkov wrote: > We have several reports of vblank timeout messages. However after some > debugging it was found that there might be different causes to that. > Include the actual CTL_FLUSH value into the timeout message. This allows > us to identify the DPU block that gets stuck. > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- > drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > 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 d0f56c5c4cce..fb34067ab6af 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c > @@ -489,7 +489,7 @@ static int dpu_encoder_phys_vid_wait_for_commit_done( > (hw_ctl->ops.get_flush_register(hw_ctl) == 0), > msecs_to_jiffies(50)); > if (ret <= 0) { > - DPU_ERROR("vblank timeout\n"); > + DPU_ERROR("vblank timeout: %x\n", hw_ctl->ops.get_flush_register(hw_ctl)); > return -ETIMEDOUT; > } Nothing wrong with this change. But I dont know how much information this is giving to really find out what is causing the vblank timeout. Sure, we know which flush bit is actually stuck but we dont know why its stuck. We should add a logic here to get the snapshot on the first vblank timeout that way we avoid excessive capture as well similar to the other fatal locations of calling snapshot. > > > --- > base-commit: 39676dfe52331dba909c617f213fdb21015c8d10 > change-id: 20240106-fd-dpu-debug-timeout-e917f0bc8063 > > Best regards,
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 d0f56c5c4cce..fb34067ab6af 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c @@ -489,7 +489,7 @@ static int dpu_encoder_phys_vid_wait_for_commit_done( (hw_ctl->ops.get_flush_register(hw_ctl) == 0), msecs_to_jiffies(50)); if (ret <= 0) { - DPU_ERROR("vblank timeout\n"); + DPU_ERROR("vblank timeout: %x\n", hw_ctl->ops.get_flush_register(hw_ctl)); return -ETIMEDOUT; }
We have several reports of vblank timeout messages. However after some debugging it was found that there might be different causes to that. Include the actual CTL_FLUSH value into the timeout message. This allows us to identify the DPU block that gets stuck. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 39676dfe52331dba909c617f213fdb21015c8d10 change-id: 20240106-fd-dpu-debug-timeout-e917f0bc8063 Best regards,