linux-kernel - Re: [PATCH v2 1/2] socfpga: hotplug: put cpu1 in wfi

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Message-ID: <alpine.DEB.2.02.1410070918000.9610@atx-linux-37>
Date:	Tue, 7 Oct 2014 09:19:00 -0500
From:	atull <atull@...nsource.altera.com>
To:	Pavel Machek <pavel@...x.de>
CC:	<dinguyen@...nsource.altera.com>, <linux@....linux.org.uk>,
	<yvanderv@...nsource.altera.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<delicious.quinoa@...il.com>
Subject: Re: [PATCH v2 1/2] socfpga: hotplug: put cpu1 in wfi

On Tue, 7 Oct 2014, Pavel Machek wrote:

> On Wed 2014-10-01 14:38:23, atull@...nsource.altera.com wrote:
> > From: Alan Tull <atull@...nsource.altera.com>
> > 
> > Use WFI when putting CPU1 to sleep.  Don't hold CPU1 in reset
> > since that results in increased power consumption.
> > 
> > Reset CPU1 briefly during CPU1 bootup.
> > 
> > This has been tested for hotplug and suspend/resume and results
> > in no increased power consumption.
> > 
> > Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> 
> It is nice to Cc people who commented ont the patch before.

HI Pavel,

OK, adding you and others who commented.

> 
> >  	if (cpu1start_addr) {
> > +		/* This will put CPU #1 into reset. */
> > +		__raw_writel(RSTMGR_MPUMODRST_CPU1,
> > +			     rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
> > +
> 
> I thought conclusion was to use writel (not __raw variant) here?

Yes it was.  Fixed in v3, soon.

Alan

> 
> -- 
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