[libcamera-devel] Need help with IPU6 vs SimplePipeLine handler

[Andrey Konovalov]

Hi Hans,

On 01.10.2023 12:32, Laurent Pinchart via libcamera-devel wrote:
> Hi Hans,
> 
> On Sun, Oct 01, 2023 at 11:14:33AM +0200, Hans de Goede via libcamera-devel wrote:
>> Hi All,
>>
>> I have raw bayer capture working from the cmdline, but after this naive patch:
>>
>> --- a/src/libcamera/pipeline/simple/simple.cpp
>> +++ b/src/libcamera/pipeline/simple/simple.cpp
>> @@ -196,6 +196,7 @@ static const SimplePipelineInfo supportedDevices[] = {
>>   	{ "mxc-isi", {} },
>>   	{ "qcom-camss", {} },
>>   	{ "sun6i-csi", {} },
>> +	{ "intel-ipu6", {} },
>>   };
>>   
>>   } /* namespace */
>>
>>
>> qcam still does not see the camera. I believe that this is likely caused
>> by the CSI2-receiver on the IPU6 not being so simple. It appears to have
>> some sort of cross-switch giving it a whole bunch of different inputs
>> and outputs and we need to set that up to connect the CSI data from the sensor
>> to one of the inputs and likewise make it dump the raw bayer data into
>> /dev/video#.
> 
> Could you provide the output of media-ctl --print-dot ? It will help
> visualize the topology, the text representation is a monster.

Also if you prepend your qcam command with LIBCAMERA_LOG_LEVELS=SimplePipeline:DEBUG
you will see how SimplePipeline handler is trying to configure the pipeline.

Thanks,
Andrey

>> Specifically I need to run the following script before capturing raw
>> bayer from /dev/video0 :
>>
>> ```
>> #!/bin/bash
>>
>> MDEV=/dev/media0
>>
>> media-ctl -d $MDEV -l "\"ov2740 19-0036\":0 -> \"Intel IPU6 CSI2 1\":0[1]"
>>
>> media-ctl -d $MDEV -V "\"ov2740 19-0036\":0 [fmt:SGRBG10/1932x1092]"
>> media-ctl -d $MDEV -V "\"Intel IPU6 CSI2 1\":0 [fmt:SGRBG10/1932x1092]"
>> media-ctl -d $MDEV -V "\"Intel IPU6 CSI2 1\":1 [fmt:SGRBG10/1932x1092]"
>>
>> media-ctl -d $MDEV -l "\"ov2740 19-0036\":0 -> \"Intel IPU6 CSI2 1\":0[1]"
>> media-ctl -d $MDEV -l "\"Intel IPU6 CSI2 1\":1 -> \"Intel IPU6 ISYS Capture 0\":0[5]"
>> ```
>>
>> Full media-ctl -p output below. So I guess that even without the ISP IPU6
>> is probably going to need its own pipelinehandler, or am I missing something here?
> 
> [snip]
>