[PATCH v3 2/2] pipeline: simple: Use proper device for frame start events

[Bingbu Cao]

On 2/25/25 5:14 AM, Laurent Pinchart wrote:
> (CC'ing Bingbu)
> 
> On Mon, Feb 24, 2025 at 02:29:52PM +0100, Stanislaw Gruszka wrote:
>> On Mon, Feb 24, 2025 at 02:24:12PM +0200, Laurent Pinchart wrote:
>>> On Mon, Feb 24, 2025 at 12:02:30PM +0100, Stanislaw Gruszka wrote:
>>>>
>>>>> I expect CSI-2 errors to be extremely rare. Did you actually get some ?
>>>>> Or were frames dropped by the driver due to buffer queue underruns ?
>>>>
>>>> It's quite good reproducible for IPU6 when first start using camera
>>>> after boot.
>>>>
>>>> [   82.758542] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Payload checksum (CRC) error
>>>> [   83.250939] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Single packet header error corrected
>>>> [   83.250962] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Multiple packet header errors detected
>>>> [   83.250964] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Payload checksum (CRC) error
>>>> [   83.250965] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Incomplete long packet detected
>>>> [   83.250966] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Frame sync error
>>>> [   83.250967] intel_ipu6_isys.isys intel_ipu6.isys.40: csi2-1 error: Inter-frame long packet discarded
>>>>
>>>> Not really sure why. After initial errors, things get to
>>>> work and no other cis2 errors happen.
>>>
>>> And that's only the first time after boot ? That sounds like a driver
>>> bug. What happens if you unload and reload the driver, does the first
>>> capture session after reloading exhibit the same problems ?
>>
>> Reloading intel-ipu6-isys does not exhibit the problem.
>> However reloading the sensor driver ov2740 does.
>> Is sufficient to reload ov2740 module and start the qcam
>> to get those csi2-1 errors.
> 
> Bingbu, Sakari, this sounds like a bug in a driver somewhere.
>

Stanislaw,

Which device are you using? I can try it if I have such device.

Have you a chance to check whether you can reproduce same problem with
other camera sensors (or other devices)?

In my experience, such errors report likely caused by bad frames from
sensor in corner case.

-- 
Best regards,
Bingbu Cao