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

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Date:   Fri, 31 Jan 2020 18:03:51 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Hans Verkuil <hverkuil@...all.nl>
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 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.

Thierry

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