linux-kernel - Re: [linux-pm] [RFC,PATCHv3 0/3] sdhci runtime

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Message-ID: <Pine.LNX.4.44L0.1103011528230.2034-100000@iolanthe.rowland.org>
Date:	Tue, 1 Mar 2011 15:30:29 -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 0/3] sdhci runtime_pm implementation

On Tue, 1 Mar 2011, Pierre Tardy wrote:

> >> > Other drivers do it, but they use PCI PME# instead of interrupts.
> >> Could you please elaborate?
> >> My understanding is that PCI PME will generate MSI, which translate in
> >> interrupt.
> >
> > It depends on the platform.  On systems with ACPI, PCI PME generates an
> > ACPI I/O event, which is handled by the ACPI and PM cores.  It does not
> > invoke the device driver's interrupt handler.
> So, let's say, in the ACPI case, if the interrupt handler dont get
> called, how would the driver know that he got a sdcard insert event,
> and trigger a mmc_rescan() ?

When the ACPI and PCI cores process the PME event, they call
pm_runtime_resume().  The driver's runtime_resume routine would read
the device status and see the insert event, which would cause it to
trigger mmc_rescan().

Alan Stern

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