linux-kernel - Re: [PATCH v8 5/6] pwm: bcm2835: Allow PWM driver to be used in atomic context

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Message-ID: <ZYAKjTdr64GlCnxU@gofer.mess.org>
Date: Mon, 18 Dec 2023 09:02:05 +0000
From: Sean Young <sean@...s.org>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: linux-media@...r.kernel.org, linux-pwm@...r.kernel.org,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 5/6] pwm: bcm2835: Allow PWM driver to be used in
 atomic context

On Tue, Dec 12, 2023 at 07:14:44PM +0100, Uwe Kleine-König wrote:
> Hello Sean,
> 
> On Tue, Dec 12, 2023 at 05:08:38PM +0100, Uwe Kleine-König wrote:
> > On Tue, Dec 12, 2023 at 08:34:04AM +0000, Sean Young wrote:
> > > @@ -169,6 +179,7 @@ static int bcm2835_pwm_suspend(struct device *dev)
> > >  {
> > >  	struct bcm2835_pwm *pc = dev_get_drvdata(dev);
> > >  
> > > +	clk_rate_exclusive_put(pc->clk);
> > >  	clk_disable_unprepare(pc->clk);
> > 
> > I thought this was the remove function, but that's suspend. Adding
> > clk_rate_exclusive_put() there is wrong.
> 
> https://lore.kernel.org/linux-clk/744a6371f94fe96f527eea6e52a600914e6fb6b5.1702403904.git.u.kleine-koenig@pengutronix.de/
> might be useful to fix this.

That does look useful, I suppose I can only use it once it's merged in
pwm-next though. Leaving out for v9.

Thanks,
Sean