linux-kernel - Re: [RFC PATCH v1 0/5] Add Tegra driver for video capture

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Date:   Fri, 31 Jan 2020 18:37:10 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Sowjanya Komatineni <skomatineni@...dia.com>, jonathanh@...dia.com,
        frankc@...dia.com, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/5] Add Tegra driver for video capture

On 1/31/20 6:03 PM, Thierry Reding wrote:
> On Fri, Jan 31, 2020 at 03:29:52PM +0100, Hans Verkuil wrote:
>> On 1/30/20 4:42 PM, Thierry Reding wrote:
>>> On Thu, Jan 30, 2020 at 03:41:50PM +0100, Hans Verkuil wrote:
>>>> Hi Sowjanya,
>>>>
>>>> On 1/28/20 7:23 PM, Sowjanya Komatineni wrote:
>>>>> This series adds Tegra210 VI and CSI driver for built-in test pattern
>>>>> generator (TPG) capture.
>>>>>
>>>>> Tegra210 supports max 6 channels on VI and 6 ports on CSI where each
>>>>> CSI port is one-to-one mapped to VI channel for video capture.
>>>>>
>>>>> This series has TPG support only where it creates hard media links
>>>>> between CSI subdevice and VI video device without device graphs.
>>>>>
>>>>> v4l2-compliance results are available below the patch diff.
>>>>>
>>>>> [v0]:	Includes,
>>>>> 	- Adds CSI TPG clock to Tegra210 clock driver
>>>>> 	- Host1x video driver with VI and CSI clients.
>>>>> 	- Support for Tegra210 only.
>>>>> 	- VI CSI TPG support with hard media links in driver.
>>>>> 	- Video formats supported by Tegra210 VI
>>>>> 	- CSI TPG supported video formats
>>>>
>>>> I'm trying to compile this patch series using the media_tree master
>>>> branch (https://git.linuxtv.org//media_tree.git), but it fails:
>>>>
>>>> drivers/staging/media/tegra/tegra-channel.c: In function ‘tegra_channel_queue_setup’:
>>>> drivers/staging/media/tegra/tegra-channel.c:71:15: warning: unused variable ‘count’ [-Wunused-variable]
>>>>    71 |  unsigned int count = *nbuffers;
>>>>       |               ^~~~~
>>>> drivers/staging/media/tegra/tegra-channel.c: In function ‘tegra_channel_init’:
>>>> drivers/staging/media/tegra/tegra-channel.c:518:55: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   518 |  struct tegra_camera *cam = dev_get_drvdata(vi->client.host);
>>>>       |                                                       ^
>>>> make[4]: *** [scripts/Makefile.build:265: drivers/staging/media/tegra/tegra-channel.o] Error 1
>>>> make[4]: *** Waiting for unfinished jobs....
>>>> drivers/staging/media/tegra/tegra-vi.c: In function ‘tegra_vi_tpg_graph_init’:
>>>> drivers/staging/media/tegra/tegra-vi.c:157:55: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   157 |  struct tegra_camera *cam = dev_get_drvdata(vi->client.host);
>>>>       |                                                       ^
>>>> drivers/staging/media/tegra/tegra-vi.c: In function ‘tegra_vi_init’:
>>>> drivers/staging/media/tegra/tegra-csi.c: In function ‘tegra_csi_init’:
>>>> drivers/staging/media/tegra/tegra-vi.c:213:51: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   213 |  struct tegra_camera *cam = dev_get_drvdata(client->host);
>>>>       |                                                   ^~
>>>> drivers/staging/media/tegra/tegra-csi.c:259:51: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   259 |  struct tegra_camera *cam = dev_get_drvdata(client->host);
>>>>       |                                                   ^~
>>>> drivers/staging/media/tegra/tegra-vi.c: In function ‘tegra_vi_exit’:
>>>> drivers/staging/media/tegra/tegra-vi.c:246:51: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   246 |  struct tegra_camera *cam = dev_get_drvdata(client->host);
>>>>       |                                                   ^~
>>>> drivers/staging/media/tegra/tegra-csi.c: In function ‘tegra_csi_exit’:
>>>> drivers/staging/media/tegra/tegra-csi.c:286:51: error: ‘struct host1x_client’ has no member named ‘host’
>>>>   286 |  struct tegra_camera *cam = dev_get_drvdata(client->host);
>>>>       |                                                   ^~
>>>>
>>>> And indeed, struct host1x_client as defined in include/linux/host1x.h doesn't
>>>> have a 'host' field.
>>>>
>>>> Does this series depend on another patch that's not yet in mainline?
>>>
>>> Sowjanya's been working on top of linux-next, so, yes, this patch
>>> depends on a change that's been merged into the DRM tree for v5.6-rc1.
>>>
>>> Thierry
>>>
>>
>> Is there a specific linux-next tag that works? I tried next-20200131 but that
>> failed to boot. Same problem with the mainline repo since the host1x patches
>> were merged yesterday. It compiles fine, but the boot just stops. Or am I
>> missing some kernel config that is now important to have?
> 
> linux-next and mainline are currently regressing on Tegra210 (and some
> Tegra124) boards. I just sent out a series that fixes the regression for
> me:
> 
> 	http://patchwork.ozlabs.org/project/linux-tegra/list/?series=156215
> 
> Please test if this works for you. If so, I'll send this to Dave as soon
> as possible.

I'll try it on Tuesday as I don't have access to the Jetson TX1 until then. It
looks promising since I think that the last message I saw was a PM message.

Regards,

	Hans