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

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Date: Sun, 25 Feb 2024 13:03:40 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: 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>,
        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 12:57 PM, Dmitry Baryshkov wrote:
> On Sun, 25 Feb 2024 at 21:44, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>>
>>
>>
>> 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?
> 
> I'd prefer to keep it. The devcoredump captures all registers, while
> CTL_FLUSH points to the actual bit without the need to analyze the
> coredump. At the very least, it allows us to analyze whether the issue
> is the same or not (compare SSPP_DMA2 on c630 vs LM_1 on sdm660)
> without looking into the dump.
> 

Ok, sg


Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

>>
>>> 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;
>>>        }
>>>
>>>
> 
> 
>