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Subject: Re: [RFC PATCH v1 0/5] Add Tegra driver for video capture
To:     Sowjanya Komatineni <skomatineni@nvidia.com>,
        thierry.reding@gmail.com, jonathanh@nvidia.com, frankc@nvidia.com
Cc:     linux-media@vger.kernel.org, devicetree@vger.kernel.org,
        linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <1580235801-4129-1-git-send-email-skomatineni@nvidia.com>
From:   Hans Verkuil <hverkuil@xs4all.nl>
Message-ID: <098ac46f-fe13-f215-b9a4-aa8d01395592@xs4all.nl>
Date:   Tue, 4 Feb 2020 13:53:29 +0100
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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
> 
> 
> Sowjanya Komatineni (5):
>   dt-bindings: clock: tegra: Add clk id for CSI TPG clock
>   clk: tegra: Add Tegra210 CSI TPG clock gate
>   dt-binding: tegra: Add VI and CSI bindings
>   media: tegra: Add Tegra Video input driver for Tegra210
>   arm64: tegra: Add Tegra VI CSI suppport in device tree
> 
>  .../display/tegra/nvidia,tegra20-host1x.txt        |  10 +-
>  arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi     |   8 +
>  arch/arm64/boot/dts/nvidia/tegra210.dtsi           |  31 +-
>  drivers/clk/tegra/clk-tegra210.c                   |   7 +
>  drivers/staging/media/Kconfig                      |   2 +
>  drivers/staging/media/Makefile                     |   1 +
>  drivers/staging/media/tegra/Kconfig                |  12 +
>  drivers/staging/media/tegra/Makefile               |  11 +
>  drivers/staging/media/tegra/TODO                   |  10 +
>  drivers/staging/media/tegra/csi.h                  | 111 ++++
>  drivers/staging/media/tegra/csi2_fops.c            | 335 +++++++++++
>  drivers/staging/media/tegra/csi2_fops.h            |  15 +
>  drivers/staging/media/tegra/host1x-video.c         | 120 ++++
>  drivers/staging/media/tegra/host1x-video.h         |  33 ++
>  drivers/staging/media/tegra/mc_common.h            | 131 +++++
>  drivers/staging/media/tegra/tegra-channel.c        | 628 +++++++++++++++++++++
>  drivers/staging/media/tegra/tegra-core.c           | 111 ++++
>  drivers/staging/media/tegra/tegra-core.h           | 125 ++++
>  drivers/staging/media/tegra/tegra-csi.c            | 380 +++++++++++++
>  drivers/staging/media/tegra/tegra-vi.c             | 351 ++++++++++++
>  drivers/staging/media/tegra/tegra-vi.h             | 101 ++++
>  drivers/staging/media/tegra/vi2_fops.c             | 364 ++++++++++++
>  drivers/staging/media/tegra/vi2_fops.h             |  15 +
>  drivers/staging/media/tegra/vi2_formats.h          | 119 ++++
>  drivers/staging/media/tegra/vi2_registers.h        | 194 +++++++
>  include/dt-bindings/clock/tegra210-car.h           |   2 +-
>  26 files changed, 3224 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/staging/media/tegra/Kconfig
>  create mode 100644 drivers/staging/media/tegra/Makefile
>  create mode 100644 drivers/staging/media/tegra/TODO
>  create mode 100644 drivers/staging/media/tegra/csi.h
>  create mode 100644 drivers/staging/media/tegra/csi2_fops.c
>  create mode 100644 drivers/staging/media/tegra/csi2_fops.h
>  create mode 100644 drivers/staging/media/tegra/host1x-video.c
>  create mode 100644 drivers/staging/media/tegra/host1x-video.h
>  create mode 100644 drivers/staging/media/tegra/mc_common.h
>  create mode 100644 drivers/staging/media/tegra/tegra-channel.c
>  create mode 100644 drivers/staging/media/tegra/tegra-core.c
>  create mode 100644 drivers/staging/media/tegra/tegra-core.h
>  create mode 100644 drivers/staging/media/tegra/tegra-csi.c
>  create mode 100644 drivers/staging/media/tegra/tegra-vi.c
>  create mode 100644 drivers/staging/media/tegra/tegra-vi.h
>  create mode 100644 drivers/staging/media/tegra/vi2_fops.c
>  create mode 100644 drivers/staging/media/tegra/vi2_fops.h
>  create mode 100644 drivers/staging/media/tegra/vi2_formats.h
>  create mode 100644 drivers/staging/media/tegra/vi2_registers.h
> 
> 
> v4l2-compliance SHA: e7402fb758fd106955c3b7d5a5e961d1cb606f4a, 32 bits, 32-bit time_t
> 
> Compliance test for tegra-video device /dev/video0:

Since this driver creates a /dev/media0 device you should test with:

v4l2-compliance -m0 -s10: that tests everything found in the media topology.

It finds a few issues in the media topology itself:

----------------------------------------------------------------------------
$ v4l2-compliance -M0
v4l2-compliance SHA: 5af0730d06247a2de487abf2e00e70b156f1fb82, 64 bits, 64-bit time_t

Compliance test for host1x_video device /dev/media0:

Media Driver Info:
        Driver name      : host1x_video
        Model            : NVIDIA Tegra Video Input Device
        Serial           :
        Bus info         :
        Media version    : 5.5.0
        Hardware revision: 0x00000003 (3)
        Driver version   : 5.5.0

Required ioctls:
                warn: v4l2-test-media.cpp(52): empty bus_info
        test MEDIA_IOC_DEVICE_INFO: OK

Allow for multiple opens:
        test second /dev/media0 open: OK
                warn: v4l2-test-media.cpp(52): empty bus_info
        test MEDIA_IOC_DEVICE_INFO: OK
        test for unlimited opens: OK

Media Controller ioctls:
                fail: v4l2-test-media.cpp(117): function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN
                fail: v4l2-test-media.cpp(203): checkFunction(ent.function, true)
        test MEDIA_IOC_G_TOPOLOGY: FAIL
                fail: v4l2-test-media.cpp(390): num_data_links != num_links
        test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL
        test MEDIA_IOC_SETUP_LINK: OK
        test invalid ioctls: OK

Total for host1x_video device /dev/media0: 8, Succeeded: 6, Failed: 2, Warnings: 2
----------------------------------------------------------------------------

Note: the -M0 option tests just /dev/media0 without testing any of the devices
mentioned in the topology. Use -m0 for that.

I see a lot of spam in the kernel log:

[  484.362145] tegra-vi 54080000.vi: TPG mode is set to Black/White Direct Mode
[  486.147937] tegra-csi 54080838.csi: using Tegra default WIDTH X HEIGHT (1920x1080)
[  486.155499] tegra-csi 54080838.csi: using Tegra default RAW10 video format
[  486.162403] tegra-csi 54080838.csi: using Tegra default RAW10 video format

Change that to dev_dbg or delete altogether.

I also noticed that changing the test pattern while streaming did not seem to have
any effect until I stop and restart streaming. Is that a limitation of the HW or of
the driver?

Note that the RGB pixelformat appears to be incorrect: it is set to RGB32 but it
should be BGR32. Actually, it should be XBGR32 since there is no alpha channel
present (I think). RGB32 and BGR32 are deprecated in favor of RGBX/A and X/ABGR.

Regards,

	Hans

> 
> Driver Info:
>         Driver name      : tegra-video
>         Card type        : 54080000.vi-output-0
>         Bus info         : platform:54080000.vi:0
>         Driver version   : 5.5.0
>         Capabilities     : 0x85200001
>                 Video Capture
>                 Read/Write
>                 Streaming
>                 Extended Pix Format
>                 Device Capabilities
>         Device Caps      : 0x05200001
>                 Video Capture
>                 Read/Write
>                 Streaming
>                 Extended Pix Format
> Media Driver Info:
>         Driver name      : host1x_video
>         Model            : NVIDIA Tegra Video Input Device
>         Serial           :
>         Bus info         :
>         Media version    : 5.5.0
>         Hardware revision: 0x00000003 (3)
>         Driver version   : 5.5.0
> Interface Info:
>         ID               : 0x03000003
>         Type             : V4L Video
> Entity Info:
>         ID               : 0x00000001 (1)
>         Name             : 54080000.vi-output-0
>         Function         : V4L2 I/O
>         Pad 0x01000002   : 0: Sink
>           Link 0x0200001b: from remote pad 0x100001a of entity 'tpg-0': Data, Enabled
> 
> Required ioctls:
>         test MC information (see 'Media Driver Info' above): OK
>         test VIDIOC_QUERYCAP: OK
> 
> Allow for multiple opens:
>         test second /dev/video0 open: OK
>         test VIDIOC_QUERYCAP: OK
>         test VIDIOC_G/S_PRIORITY: OK
>         test for unlimited opens: OK
> 
>         test invalid ioctls: OK
> Debug ioctls:
>         test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
>         test VIDIOC_LOG_STATUS: OK (Not Supported)
> 
> Input ioctls:
>         test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
>         test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>         test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
>         test VIDIOC_ENUMAUDIO: OK (Not Supported)
>         test VIDIOC_G/S/ENUMINPUT: OK
>         test VIDIOC_G/S_AUDIO: OK (Not Supported)
>         Inputs: 1 Audio Inputs: 0 Tuners: 0
> 
> Output ioctls:
>         test VIDIOC_G/S_MODULATOR: OK (Not Supported)
>         test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
>         test VIDIOC_ENUMAUDOUT: OK (Not Supported)
>         test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
>         test VIDIOC_G/S_AUDOUT: OK (Not Supported)
>         Outputs: 0 Audio Outputs: 0 Modulators: 0
> 
> Input/Output configuration ioctls:
>         test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
>         test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
>         test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
>         test VIDIOC_G/S_EDID: OK (Not Supported)
> 
> Control ioctls (Input 0):
>         test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
>         test VIDIOC_QUERYCTRL: OK
>         test VIDIOC_G/S_CTRL: OK
>         test VIDIOC_G/S/TRY_EXT_CTRLS: OK
>         test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
>         test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
>         Standard Controls: 2 Private Controls: 0
> 
> Format ioctls (Input 0):
>         test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
>         test VIDIOC_G/S_PARM: OK (Not Supported)
>         test VIDIOC_G_FBUF: OK (Not Supported)
>         test VIDIOC_G_FMT: OK
>         test VIDIOC_TRY_FMT: OK
>         test VIDIOC_S_FMT: OK
>         test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
>         test Cropping: OK (Not Supported)
>         test Composing: OK (Not Supported)
>         test Scaling: OK (Not Supported)
> 
> Codec ioctls (Input 0):
>         test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
>         test VIDIOC_G_ENC_INDEX: OK (Not Supported)
>         test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)
> 
> Buffer ioctls (Input 0):
>         test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
>         test VIDIOC_EXPBUF: OK
>         test Requests: OK (Not Supported)
> 
> Test input 0:
> 
> Streaming ioctls:
>         test read/write: OK
>         test blocking wait: OK
>         test MMAP (no poll): OK
>         test MMAP (select): OK
>         test MMAP (epoll): OK
>         test USERPTR (no poll): OK (Not Supported)
>         test USERPTR (select): OK (Not Supported)
>         test DMABUF: Cannot test, specify --expbuf-device
> 
> Total for tegra-video device /dev/video0: 53, Succeeded: 53, Failed: 0, Warnings: 0
>