linux-kernel - Re: [PATCH v5 02/11] i2c: omap: wakeup the controller during suspend() callback

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Date: Fri, 19 Apr 2024 10:47:03 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Tony Lindgren <tony@...mide.com>, 
	Aaro Koskinen <aaro.koskinen@....fi>, Janusz Krzysztofik <jmkrzyszt@...il.com>, 
	Vignesh R <vigneshr@...com>, Peter Rosin <peda@...ntia.se>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Siddharth Vadapalli <s-vadapalli@...com>, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org, linux-pci@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, gregory.clement@...tlin.com, theo.lebrun@...tlin.com, 
	thomas.petazzoni@...tlin.com, u-kumar1@...com, Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH v5 02/11] i2c: omap: wakeup the controller during
 suspend() callback

Hi Thomas,

> +static int omap_i2c_suspend(struct device *dev)
> +{
> +	/*
> +	 * If the controller is autosuspended, there is no way to wakeup it once
> +	 * runtime pm is disabled (in suspend_late()).
> +	 * But a device may need the controller up during suspend_noirq() or
> +	 * resume_noirq().
> +	 * Wakeup the controller while runtime pm is enabled, so it is available
> +	 * until its suspend_noirq(), and from resume_noirq().
> +	 */
> +	return pm_runtime_resume_and_get(dev);
> +}
> +
> +static int omap_i2c_resume(struct device *dev)
> +{
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_put_autosuspend(dev);
> +
> +	return 0;
> +}
> +
>  static const struct dev_pm_ops omap_i2c_pm_ops = {
>  	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
>  				      pm_runtime_force_resume)
> +	SET_SYSTEM_SLEEP_PM_OPS(omap_i2c_suspend, omap_i2c_resume)

If you don't have CONFIG_PM_SLEEP, though, this doesn't compile.

Andi