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Message-ID: <35306580.ZCUI1aZasW@vostro.rjw.lan> Date: Sat, 17 Aug 2013 01:53:36 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Li Yang-R58472 <r58472@...escale.com> Cc: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org> Subject: Re: System suspend states and device driver suspend() callback On Friday, August 16, 2013 05:13:42 PM Li Yang-R58472 wrote: > > 在 2013-8-16，下午7:22，"Rafael J. Wysocki" <rjw@...k.pl> 写道： > > > On Friday, August 16, 2013 04:06:26 PM Li Yang wrote: > >> Hi Guys, > >> > >> Is there a standard way for the device drivers to know if the system > >> is going to “standby” mode or “mem” mode when the suspend() callbacks > >> are called? > > > > No, there's none. > > > > What do you need that for? > > Some chips like ours are putting the on-chip devices into different low > power states when entering different system low power states. When we enter > system standby, on-chip devices are clock gated. While entering suspend to > ram, on-chip devices are power gated. We want to driver to act differently > too when entering different suspend states. Can you possibly use platform suspend operations to implement that (in analogy with ACPI suspend operations)? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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