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Message-ID: <1cb90bff-ce5b-c6d1-a3df-24f6306f833a@quicinc.com>
Date: Wed, 14 Feb 2024 10:02:12 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark
<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten
<marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Daniel
Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/msm/dpu: make "vblank timeout" more useful
On 2/8/2024 6:50 AM, 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.
> To allow us to identify the DPU block that gets stuck, include the
> actual CTL_FLUSH value into the timeout message and trigger the devcore
> snapshot capture.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> Changes in v2:
> - Added a call to msm_disp_snapshot_state() to trigger devcore dump
> (Abhinav)
> - Link to v1: https://lore.kernel.org/r/20240106-fd-dpu-debug-timeout-v1-1-6d9762884641@linaro.org
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 3 ++-
> 1 file changed, 2 insertions(+), 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..a8d6165b3c0a 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 +489,8 @@ 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));
> + msm_disp_snapshot_state(phys_enc->parent->dev);
There is no rate limiting in this piece of code unfortunately. So this
will flood the number of snapshots.
Short-term solution is you can go with a vblank_timeout_cnt and reset it
in the enable() like other similar error counters.
long-term solution is we need to centralize these error locations to one
single dpu_encoder_error_handler() with a single counter and the error
handler will print out the error code along with the snapshot instead of
the snapshot being called from all over the place.
> return -ETIMEDOUT;
> }
>
>
> ---
> base-commit: 39676dfe52331dba909c617f213fdb21015c8d10
> change-id: 20240106-fd-dpu-debug-timeout-e917f0bc8063
>
> Best regards,
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