linux-kernel - Re: [PATCH v3 1/3] drm/msm/dpu: make "vblank timeout" more useful

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Message-ID: <4e6b41f4-27a6-4c65-dc03-67437a9716ed@quicinc.com>
Date: Sun, 25 Feb 2024 11:43:57 -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: Steev Klimaszewski <steev@...i.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] drm/msm/dpu: make "vblank timeout" more useful



On 2/25/2024 6:12 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.
> 

the flush register shall also be part of the coredump in patch 3. so why 
is this needed?

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.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 2aa72b578764..6058706f03e4 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
> @@ -480,7 +480,7 @@ 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;
>   	}
>   
>