linux-kernel - Re: [RFC PATCH v11 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <1b23178b-0e5c-c97e-434c-f9cc3c02805b@nvidia.com>
Date:   Thu, 30 Apr 2020 12:32:35 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <hverkuil@...all.nl>,
        <sakari.ailus@....fi>, <helen.koike@...labora.com>
CC:     <sboyd@...nel.org>, <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 v11 6/9] media: tegra: Add Tegra210 Video input driver


On 4/30/20 6:38 AM, Dmitry Osipenko wrote:
> 30.04.2020 01:00, Sowjanya Komatineni пишет:
>> +/**
>> + * struct tegra_csi_ops - Tegra CSI operations
>> + *
>> + * @csi_streaming: programs csi hardware to enable or disable streaming.
>> + * @csi_err_recover: csi hardware block recovery in case of any capture errors
>> + *		due to missing source stream or due to improper csi input from
>> + *		the external source.
>> + */
>> +struct tegra_csi_ops {
>> +	int (*csi_streaming)(struct tegra_csi_channel *csi_chan, u8 pg_mode,
>> +			     int enable);
> What about to split csi_streaming() into csi_start_streaming() /
> csi_stop_streaming()?
>
> This will make tegra_csi_ops to be consistent with the tegra_ve_ops. A
> separated start/stop operations are somewhat more natural to have in
> general.

vi ops is for vb2_ops which has separate start/stop so has seperate 
start/stop for vi ops.

csi is subdev and csi ops is for v4l2_subdev_ops which as s_stream 
callback only.

So, created single stream function for csi to match same as subdev_ops.