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Subject: Re: [RFC PATCH v1 0/5] Add Tegra driver for video capture
To:     Hans Verkuil <hverkuil@xs4all.nl>, <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>
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 <6c3d2557-8982-37bf-810a-6d9faad9e5a4@nvidia.com>
 <9c4775f2-8188-43f4-1de1-56620fad2e7c@xs4all.nl>
From:   Sowjanya Komatineni <skomatineni@nvidia.com>
Message-ID: <af813a4e-339c-4254-75a0-8db995fe2aba@nvidia.com>
Date:   Tue, 4 Feb 2020 11:02:49 -0800
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On 2/4/20 9:22 AM, Hans Verkuil wrote:
> External email: Use caution opening links or attachments
>
>
> On 2/4/20 5:42 PM, Sowjanya Komatineni wrote:
>> On 2/4/20 4:53 AM, Hans Verkuil wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> 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.
>> OK
>>> 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.
>> ok, removed TPG mode message in v2.
>>
>> Other above messages are to log using default format when requested
>> format is not supported by TPG mode.
>>
>> Will change them to dev_dbg.
>>
>>> 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?
>> Do you mean changing test pattern mode of different channel while other
>> channels are streaming?
> No, from the same channel. E.g. v4l2-ctl --stream-mmap, then do from another
> console 'v4l2-ctl -c test-pattern=1'.
>
> It depends on the hardware whether or not you can change the test pattern
> while streaming. But it is nice for testing if this is possible.

Test-pattern mode changes during active streaming will not get set as 
test-pattern mode is in CSI and mode is set every time during the start 
of streaming and then VI keeps capturing the frames.

basically its during CSI subdevice stream enable.


>> In v1, pg mode from handler is stored in vi which is common for all
>> channels.
>>
>> So, v2 has change to use channel specific pg mode rather than common
>> mode for all channels.
> That sounds better. You want independent test patterns for each channel
> if possible.
>
> Regards,
>
>          Hans
>
>>> 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
>> Will fix it.
>>>> 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
>>>>