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

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Date:   Wed, 5 Feb 2020 08:57:32 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com
Cc:     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 2/4/20 8:02 PM, Sowjanya Komatineni wrote:
>>>> 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.

OK. Just add a little comment either at the point the control is created or
where the control is set in vi_s_ctrl(). It's just to document that this
will only take effect at the next streamon.

Regards,

	Hans