linux-kernel - Re: [PATCH 0/5] ARM: Centralize the access to the SCU register

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Date:	Tue, 1 Jul 2014 15:42:56 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
CC:	Rob Herring <robherring2@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Tawfik Bayouk <tawfik@...vell.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 0/5] ARM: Centralize the access to the SCU register

On Fri, Jun 27, 2014 at 01:01:03AM +0200, Gregory CLEMENT wrote:
> >> The last patch removed a direct access to the SCU register by an
> >> access through the new scu_standby_enable() function. For this one I
> >> have just checked that the kernel can be built using the
> >> imx_v6_v7_defconfig config, but I didn't test it on an imx6 hardware.
> > 
> > Why would we not just turn on these 2 features unconditionally? If we
> 
> You mean in scu_enbale() ?
> 
> > don't know of any platform where they are broken, then we should just
> 
> At least on some imx6 SCU standby is broken according to the code and
> the comments.

Hi Gregory,

What's broken on particular revisions of some i.MX6 SoC is WAIT mode
support, not SCU standby.  I think the SCU standby can just be
unconditionally enabled in scu_enbale().

Shawn
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