linux-kernel - Re: [linux-pm] [RFC, PATCHv3 3/3] mmc: sdhci: handle wake-up from runtime

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Message-ID: <Pine.LNX.4.44L0.1103011525040.2034-100000@iolanthe.rowland.org>
Date:	Tue, 1 Mar 2011 15:27:54 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pierre Tardy <tardyp@...il.com>
cc:	linux-kernel@...r.kernel.org,
	<linux-pm@...ts.linux-foundation.org>, <linux-mmc@...r.kernel.org>
Subject: Re: [linux-pm] [RFC, PATCHv3 3/3] mmc: sdhci: handle wake-up from
 runtime_pm

On Tue, 1 Mar 2011, Pierre Tardy wrote:

> >> +     if (pm_runtime_suspended()) {
> >> +             host->waking_up = 1;
> >> +             /* Note that we disable temporarly the interrupt until we do the
> >> +              * resume. If we don't then we'll get constantly interrupted
> >> +              * until we actually resume.
> >> +              *
> >> +              * as the irq is shared, this might not be very friendly to our
> >> +              * irq sharers but the pm_runtime workqueue should really be
> >> +              * called soon.
> >
> > Instead of disabling the IRQ, would it be possible to tell the device
> > to stop generating an interrupt request?
> 
> Well, the device is power gated, so any access to it will cause a bus
> timeout (depending of the platform)

But could you gate the power back on and then turn off the interrupt 
request?

It seems like a foolish design to have an interrupt request that can't
be turned off by an interrupt handler.

Alan Stern

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