linux-kernel - Re: [PATCH v8 00/14] Rockchip ISP1 Driver

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Message-ID: <77968a89-eec0-bc2f-f996-ef3e21e9efd8@collabora.com>
Date:   Wed, 31 Jul 2019 11:42:26 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        linux-rockchip@...ts.infradead.org
Cc:     devicetree@...r.kernel.org, eddie.cai.linux@...il.com,
        mchehab@...nel.org, heiko@...ech.de, jeffy.chen@...k-chips.com,
        zyc@...k-chips.com, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, hans.verkuil@...co.com,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        kernel@...labora.com, ezequiel@...labora.com,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        zhengsq@...k-chips.com
Subject: Re: [PATCH v8 00/14] Rockchip ISP1 Driver



On 7/31/19 1:55 AM, Hans Verkuil wrote:
> On 7/31/19 6:33 AM, Hans Verkuil wrote:
>> On 7/31/19 6:29 AM, Hans Verkuil wrote:
>>> On 7/31/19 2:08 AM, Helen Koike wrote:
>>>>
>>>>
>>>> On 7/30/19 5:50 PM, Helen Koike wrote:
>>>>>
>>>>>
>>>>> On 7/30/19 5:15 PM, Hans Verkuil wrote:
>>>>>> On 7/30/19 8:42 PM, Helen Koike wrote:
>>>>>>> Hello,
>>>>>>>
>>>>>>> I'm re-sending a new version of ISP(Camera) v4l2 driver for rockchip
>>>>>>> rk3399 SoC.
>>>>>>>
>>>>>>> I didn't change much from the last version, just applying the
>>>>>>> suggestions made in the previous one.
>>>>>>>
>>>>>>> This patchset is also available at:
>>>>>>> https://gitlab.collabora.com/koike/linux/tree/rockchip/isp/v8
>>>>>>>
>>>>>>> Libcamera patched to work with this version:
>>>>>>> https://gitlab.collabora.com/koike/libcamera
>>>>>>> (also sent to the mailing list)
>>>>>>>
>>>>>>> I tested on the rockpi 4 with a rpi v1.3 sensor and also with the
>>>>>>> Scarlet Chromebook.
>>>>>>>
>>>>>>> Known issues (same as in v7):
>>>>>>> -------------
>>>>>>> - Reloading the module doesn't work (there is some missing cleanup when
>>>>>>> unloading)
>>>>>>> - When capturing in bayer format, changing the size doesn't seem to
>>>>>>> affect the image.
>>>>>>> - crop needs more tests
>>>>>>> - v4l2-compliance error:
>>>>>>>         fail: v4l2-test-controls.cpp(824): subscribe event for control 'Image Processing Controls' failed
>>>>>>> test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: FAIL
>>>>>>
>>>>>> Can you mail me the full v4l2-compliance output?
>>>>>
>>>>> Sure, please check here: http://ix.io/1Q5u
>>>>> I updated v4l-utils with the latest version and I re-ran bootstrap/configure/make,
>>>>> but for some reason the hash from the link above is not the latest commit, probably some
>>>>> old configuration somewhere. I'll resend this log as soon as I get v4l2-compliance
>>>>> properly updated.
>>>>
>>>> Please see the output of v4l2-compliance here with an updated v4l-utils: http://ix.io/1Q6A
>>>
>>> So this FAIL is for /dev/v4l-subdev0 (rkisp1-isp-subdev).
>>>
>>> What is weird that this subdev does not appear to have controls at all.
>>>
>>> What is the output of 'v4l2-ctl -d /dev/v4l-subdev0 -l'? And if it lists
>>> controls, then why?

root@...kpi:~# v4l2-ctl -d /dev/v4l-subdev0 -l

Image Processing Controls

                     pixel_rate 0x009f0902 (int64)  : min=1 max=2147483647 step=1 default=1 value=1 flags=read-only

root@...kpi:~# v4l2-ctl -d /dev/v4l-subdev1 -l

Image Processing Controls

                     pixel_rate 0x009f0902 (int64)  : min=1 max=2147483647 step=1 default=1 value=1 flags=read-only

It seems that ISP heritage the control from the sensor driver. I believe it
happens because isp_dev->ctrl_handler was assigned to the v4l2_dev object:

dev.c:  v4l2_ctrl_handler_init(&isp_dev->ctrl_handler, 5);
dev.c:  v4l2_dev->ctrl_handler = &isp_dev->ctrl_handler;


>>>
>>> If you run 'v4l2-compliance -u /dev/v4l-subdev0', do you get a fail as
>>> well?

Yes, but if I remove the ctrl_handler field from the struct rkisp1_isp_subdev
I don't get the error on /dev/v4l-subdev0 (ISP) anymore, I just get the error
on /dev/v4l-subdev1 (the sensor).

Here is the output of v4l2-compliance -m /dev/media0 without the
ctrl_handler field: http://ix.io/1Q9N

>>
>> I see the same issue with v4l-subdev1, but I see no "Media Driver Info"
>> in the v4l2-compliance output for that subdev. That's strange. It would
>> be good to know why that's happening.
> 
> It looks to be some parenting issue: v4l2-compliance expects to find
> a mediaX directory in /sys/dev/char/81\:Y/device/ where 81:Y is the major/minor
> of /dev/v4l-subdev1.
> 
> Because is this mi_get_media_fd() cannot find the media device for the subdev
> in v4l2-compliance.

So from my understanding this seems to be an issue in the sensor driver that
I'm using and not in the ISP (to be verified).
I'll submit the next version without the ctrl_handler field in struct rkisp1_isp_subdev,
is that ok?

Thanks
Helen


> 
> Regards,
> 
> 	Hans
>