linux-kernel - Re: [PATCH] ARM: smp_scu: Enable standby mode

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Message-ID: <20140730094332.GC12239@arm.com>
Date:	Wed, 30 Jul 2014 10:43:33 +0100
From:	Will Deacon <will.deacon@....com>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Michal Simek <michal.simek@...inx.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: smp_scu: Enable standby mode

On Tue, Jul 29, 2014 at 06:21:03PM +0100, Soren Brinkmann wrote:
> Enable the SCU standby mode.
> From documentation:
>   When set, SCU CLK is turned off when all processors are in WFI mode,
>   there is no pending request on the ACP (if implemented), and there is
>   no remaining activity in the SCU.
> 
>   When SCU CLK is off, ARREADYS, AWREADYS and WREADYS on the ACP are forced
>   LOW. The clock is turned on when any processor leaves WFI mode, or if
>   there is a new request on the ACP.
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> ---
> Hi,
> 
> I am working on some PM related patches for Zynq. One of them is
> enabling the SCU standby mode. I was wondering whether this is probably
> something that I should not do in platform specific code, but rather in
> the common code for everybody?

Take a look at Shawn's patches for this:

  http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/275326.html

Will
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