linux-kernel - Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver

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Date:   Sat, 25 Apr 2020 18:04:00 -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 v10 6/9] media: tegra: Add Tegra210 Video input driver


On 4/25/20 4:29 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 24.04.2020 06:55, Sowjanya Komatineni пишет:
>> +static int tegra_csi_init(struct host1x_client *client)
>> +{
>> +     struct tegra_csi *csi = host1x_client_to_csi(client);
>> +     struct tegra_video_device *vid = dev_get_drvdata(client->host);
>> +     int ret;
>> +
>> +     INIT_LIST_HEAD(&csi->csi_chans);
>> +
>> +     ret = pm_runtime_get_sync(csi->dev);
>> +     if (ret < 0) {
>> +             dev_err(csi->dev, "failed to get runtime PM: %d\n", ret);
>> +             pm_runtime_put_noidle(csi->dev);
>> +             return ret;
>> +     }
> The whole point of RPM is to keep hardware enabled only when needed,
> i.e. during of the capture process in this case. You should move all RPM
> handling to the capture start / stop functions.
Will move it to handle during stream start/stop