linux-kernel - Re: [PATCH] PM Sleep: Don't extend wakeup paths to devices with ignore

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Date:	Wed, 16 Nov 2011 15:52:27 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [PATCH] PM Sleep: Don't extend wakeup paths to devices with
 ignore_children set

On Wed, Nov 16, 2011 at 11:21:58PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Commit 4ca46ff3e0d8c234cb40ebb6457653b59584426c (PM / Sleep: Mark
> devices involved in wakeup signaling during suspend) introduced
> the power.wakeup_path field in struct dev_pm_info to mark devices
> whose children are enabled to wake up the system from sleep states,
> so that power domains containing the parents that provide their
> children with wakeup power and/or relay their wakeup signals are not
> turned off.  Unfortunately, that introduced a PM regression on SH7372
> whose power consumption in the system "memory sleep" state increased
> as a result of it, because it prevented the power domain containing
> the I2C controller from being turned off when some children of that
> controller were enabled to wake up the system, although the
> controller was not necessary for them to signal wakeup.
> 
> To fix this issue use the observation that devices whose
> power.ignore_children flag is set for runtime PM should be treated
> analogously during system suspend.  Namely, they shouldn't be
> included in wakeup paths going through their children.  Since the
> SH7372 I2C controller's power.ignore_children flag is set, doing so
> will restore the previous behavior of that SOC.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

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