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

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Message-ID: <ae7a4614-c84c-f5dd-d0a5-4090e1bf5a9d@gmail.com>
Date:   Sun, 26 Apr 2020 02:29:06 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.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

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.