Date:   Fri, 17 Jul 2020 10:48:18 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Hans Verkuil <hverkuil@...all.nl>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <sakari.ailus@....fi>,
        <robh+dt@...nel.org>, <helen.koike@...labora.com>
CC:     <digetx@...il.com>, <sboyd@...nel.org>,
        <gregkh@...uxfoundation.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>
Subject: Re: [RFC PATCH v3 00/18] Support for Tegra video capture from
 external sensor


On 7/17/20 10:38 AM, Sowjanya Komatineni wrote:
>
> On 7/17/20 10:23 AM, Sowjanya Komatineni wrote:
>>
>> On 7/17/20 10:08 AM, Hans Verkuil wrote:
>>> On 17/07/2020 18:34, Sowjanya Komatineni wrote:
>>>> On 7/17/20 3:54 AM, Hans Verkuil wrote:
>>>>> Hi Sowjanya,
>>>>>
>>>>> On 15/07/2020 06:20, Sowjanya Komatineni wrote:
>>>>>> This series adds support for video capture from external camera 
>>>>>> sensor to
>>>>>> Tegra video driver.
>>>>>>
>>>>>> Jetson TX1 has camera expansion connector and supports custom 
>>>>>> camera module
>>>>>> designed as per TX1 design specification.
>>>>>>
>>>>>> This series also enables camera capture support for Jetson Nano 
>>>>>> which has
>>>>>> Raspberry PI camera header.
>>>>>>
>>>>>> This series is tested with IMX219 camera sensor.
>>>>>>
>>>>>> This series include,
>>>>>>
>>>>>> VI I2C related fixes
>>>>>> - Camera sensor programming happens through VI I2C which is on 
>>>>>> host1x bus.
>>>>>> - These patches includes device tree and I2C driver fixes for VI 
>>>>>> I2C.
>>>>>>
>>>>>> Tegra video driver updates
>>>>>> - TPG Vs Non-TPG based on Kconfig
>>>>>> - Support for external sensor video capture based on device graph 
>>>>>> from DT.
>>>>>> - Support for selection ioctl operations
>>>>>> - Tegra MIPI CSI pads calibration
>>>>>> - CSI T-CLK and T-HS settle time computation based on clock rates.
>>>>>>
>>>>>> Host1x driver updates
>>>>>> - Adds API to allow creating mipi device for specific device node.
>>>>>> - Splits MIPI pads calibrate start and waiting for calibration to 
>>>>>> be done.
>>>>>>
>>>>>> Device tree updates
>>>>>> - Adds camera connector 2V8, 1V8, 1V2 regulator supplies to 
>>>>>> Jetson TX1 DT.
>>>>>> - Enabled VI and CSI support in Jetson Nano DT.
>>>>> I'm doing a bit of stress testing with:
>>>>>
>>>>> while true; do v4l2-ctl --stream-mmap --stream-count=1; done
>>>>>
>>>>> and I see that the imx274 has often streaming failures:
>>>>>
>>>>> [  172.025144] IMX274 8-001a: s_stream failed
>>>>> [  179.025192] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 3132 = 870 (2 bytes)
>>>>> [  179.033575] IMX274 8-001a: s_stream failed
>>>>> [  226.525378] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 3130 = 878 (2 bytes)
>>>>> [  226.533761] IMX274 8-001a: s_stream failed
>>>>> [  227.029325] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 30f6 = 107 (2 bytes)
>>>>> [  227.037758] IMX274 8-001a: s_stream failed
>>>>> [  247.025218] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 30f6 = 107 (2 bytes)
>>>>> [  247.033658] IMX274 8-001a: s_stream failed
>>>>> [  293.025517] IMX274 8-001a: s_stream failed
>>>>> [  309.024727] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 30e0 = 0 (2 bytes)
>>>>> [  309.032969] IMX274 8-001a: s_stream failed
>>>>> [  309.529506] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 30f8 = 11d2 (3 bytes)
>>>>> [  309.538103] IMX274 8-001a: imx274_set_frame_length error = -121
>>>>> [  309.544102] IMX274 8-001a: imx274_set_frame_interval error = -121
>>>>> [  309.550243] IMX274 8-001a: s_stream failed
>>>>> [  314.025561] IMX274 8-001a: s_stream failed
>>>>> [  329.025586] IMX274 8-001a: s_stream failed
>>>>> [  340.529567] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 303a = f0c (2 bytes)
>>>>> [  340.538009] IMX274 8-001a: s_stream failed
>>>>> [  347.525627] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 30f6 = 107 (2 bytes)
>>>>> [  347.534008] IMX274 8-001a: s_stream failed
>>>>> [  365.033640] IMX274 8-001a: s_stream failed
>>>>> [  437.525788] IMX274 8-001a: imx274_write_mbreg : i2c bulk write 
>>>>> failed, 3038 = c (2 bytes)
>>>>> [  437.533997] IMX274 8-001a: s_stream failed
>>>>> [  456.029780] IMX274 8-001a: s_stream failed
>>>>> [  472.025862] IMX274 8-001a: s_stream failed
>>>>> [  498.025861] IMX274 8-001a: s_stream failed
>>>>> [  500.025905] IMX274 8-001a: s_stream failed
>>>>>
>>>>> where v4l2-ctl returns:
>>>>>
>>>>>                   VIDIOC_STREAMON returned -1 (Remote I/O error)
>>>>>
>>>>> I don't see this with the imx219.
>>>>>
>>>>> I also see this occasionally:
>>>>>
>>>>> [Fri Jul 17 12:51:42 2020] video4linux video1: failed to run 
>>>>> capture start kthread: -4
>>>>>
>>>>> Something is not stable here.
>>>>>
>>>>> Regards,
>>>>>
>>>>>     Hans
>>>> Hi Hans,
>>>>
>>>> Running the same single frame continuous loop for more than 2 hours 
>>>> now
>>>> and I don't see any failure.
>>>>
>>>> Above failure shows i2c bulk writes to IMX274 failure due to which
>>>> s_stream also failed.
>>>>
>>>> Not sure if its due to i2c mux in the path to sensor on your module
>>>> causing some issue when there is more i2c write traffic as we are 
>>>> doing
>>>> single stream in continuous loop. Also IMX219 does not show on your 
>>>> side
>>>> so something specific to IMX274 setup probably.
>>> I'll take a closer look next week. Good to know that it works fine 
>>> for you.
>>>
>>>>
>>>> Regarding kthread_run failure where kthread_run() returned -EINTR 
>>>> during
>>>> capture start thread, I always see this happen at the point of 
>>>> stopping
>>>> the continuous single stream while loop by pressing ctrl+c after few
>>>> loops of execution.
>>> Hmm, if this is normal behavior, then should this message be a debug 
>>> message
>>> only? Or perhaps only show the message if the error code != EINTR.
>>
>> I believe its good to still show this as its reported by kthread_run 
>> -> kthread_create_on_node.
>>
>> But not sure in real usecase we will ever use while true like this 
>> and we should use script to also break while loop along with v4l2-ctl 
>> termination when ctrl-c terminate request happens.
>>
> Hi Hans, As this happens only during this type of case, I can update 
> to show message only when error code != EINTR.
>
> Thanks
>
> Sowjanya


Sorry, Was thinking to not mask debug message for -EINTR in case if it 
happens in any other valid scenarios. If you still want to mask, will 
update in next version.

>
>>
>>>
>>> Regards,
>>>
>>>     Hans
>>>
>>>> while true; do v4l2-ctl --stream-mmap --stream-count=1; done
>>>>
>>>> when we stop loop with ctrl+c, v4l2-ctl terminates but loop does not
>>>> terminate immediately and probably SIGKILLed  is seen prior to 
>>>> complete.
>>>>
>>>> Using below can help to terminate loop as well when we stop ctrl-c and
>>>> with this I don't see any repro of EINTR error from kthread_run 
>>>> when run
>>>> in infinite loop.
>>>>
>>>> while true; do ./v4l2-ctl --stream-mmap --stream-count=1 || break; 
>>>> done
>>>>
>>>>
>>>>
>>>>>> Delta between patch versions:
>>>>>>
>>>>>> [v3]:    Includes v2 feedback
>>>>>>     - Uses separate helper function for retrieving remote csi 
>>>>>> subdevice
>>>>>>       and source subdevice.
>>>>>>     - Added check for presence of subdevice ops set/get_selection
>>>>>>     - dropped vb2_queue_release from driver and using
>>>>>>       vb2_video_unregister_device instead of 
>>>>>> video_unregister_device.
>>>>>>     - video device register should happen in the last after all 
>>>>>> video
>>>>>>       device related setup is done in the driver. This is being 
>>>>>> addressed
>>>>>>       in below RFC patch. Once proper implementation of this is 
>>>>>> available
>>>>>>       will update Tegra video driver to use split APIs and do all 
>>>>>> setup
>>>>>>       prior to device register. Added this as TODO in the driver.
>>>>>> https://www.spinics.net/lists/linux-media/msg172761.html
>>>>>>
>>>>>>     Note:
>>>>>>     Patch-0012 has compilation dependency on
>>>>>>     https://patchwork.kernel.org/patch/11659521/
>>>>>>
>>>>>>
>>>>>> [v2]:    Includes below changes based on v1 feedback
>>>>>>     - dt-binding document and the driver update for device graph 
>>>>>> to use
>>>>>>       separate ports for sink endpoint and source endpoint for csi.
>>>>>>     - Use data-lanes endpoint property for csi.
>>>>>>     - Update tegra_mipi_request() to take device node pointer 
>>>>>> argument
>>>>>>       rather than adding extra API.
>>>>>>     - Remove checking for clk pointer before clk_disable.
>>>>>>
>>>>>>
>>>>>> Sowjanya Komatineni (18):
>>>>>>     dt-bindings: i2c: tegra: Document Tegra210 VI I2C clocks and
>>>>>>       power-domains
>>>>>>     arm64: tegra: Add missing clocks and power-domains to 
>>>>>> Tegra210 VI I2C
>>>>>>     i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM
>>>>>>     i2c: tegra: Remove NULL pointer check before
>>>>>>       clk_enable/disable/prepare/unprepare
>>>>>>     i2c: tegra: Fix the error path in tegra_i2c_runtime_resume
>>>>>>     i2c: tegra: Fix runtime resume to re-init VI I2C
>>>>>>     i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c
>>>>>>     media: tegra-video: Fix channel format alignment
>>>>>>     media: tegra-video: Enable TPG based on kernel config
>>>>>>     media: tegra-video: Update format lookup to offset based
>>>>>>     dt-bindings: tegra: Update VI and CSI bindings with port info
>>>>>>     media: tegra-video: Add support for external sensor capture
>>>>>>     media: tegra-video: Add support for selection ioctl ops
>>>>>>     gpu: host1x: mipi: Update tegra_mipi_request() to be node based
>>>>>>     gpu: host1x: mipi: Use readl_relaxed_poll_timeout in 
>>>>>> tegra_mipi_wait
>>>>>>     gpu: host1x: mipi: Split tegra_mipi_calibrate and 
>>>>>> tegra_mipi_wait
>>>>>>     media: tegra-video: Add CSI MIPI pads calibration
>>>>>>     media: tegra-video: Compute settle times based on the clock rate
>>>>>>
>>>>>>    .../display/tegra/nvidia,tegra20-host1x.txt        | 92 ++-
>>>>>>    .../devicetree/bindings/i2c/nvidia,tegra20-i2c.txt | 19 +-
>>>>>>    arch/arm64/boot/dts/nvidia/tegra210.dtsi           | 6 +
>>>>>>    drivers/gpu/drm/tegra/dsi.c                        | 9 +-
>>>>>>    drivers/gpu/host1x/mipi.c                          | 37 +-
>>>>>>    drivers/i2c/busses/i2c-tegra.c                     | 101 +--
>>>>>>    drivers/staging/media/tegra-video/Kconfig          | 7 +
>>>>>>    drivers/staging/media/tegra-video/csi.c            | 247 ++++++-
>>>>>>    drivers/staging/media/tegra-video/csi.h            | 8 +
>>>>>>    drivers/staging/media/tegra-video/tegra210.c       | 25 +-
>>>>>>    drivers/staging/media/tegra-video/vi.c             | 793 
>>>>>> +++++++++++++++++++--
>>>>>>    drivers/staging/media/tegra-video/vi.h             | 25 +-
>>>>>>    drivers/staging/media/tegra-video/video.c          | 23 +-
>>>>>>    include/linux/host1x.h                             | 4 +-
>>>>>>    14 files changed, 1242 insertions(+), 154 deletions(-)
>>>>>>

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