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

[Alan Stern]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/