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

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Date:	Thu, 26 Jun 2014 17:56:43 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Shawn Guo <shawn.guo@...escale.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nadav Haklai <nadavh@...vell.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/5] ARM: Centralize the access to the SCU register

On Thu, Jun 26, 2014 at 5:43 PM, Gregory CLEMENT
<gregory.clement@...e-electrons.com> wrote:
> Hello,
>
> Following the feedback I go on the patch "ARM: mvebu: Enable SCU
> Speculative linefills to L2 for Armada 375/38x" :
> http://thread.gmane.org/gmane.linux.ports.arm.kernel/335961/focus=335993
>
> I take the opportunity of adding new functions in smp_scu.c to
> centralize the other access done on the SCU register from C file in
> this file.
>
> The first patch is a preliminary clean-up in smp_scu.c.
>
> The second and the third patches add functions to manipulate the SCU
> control register.
>
> The forth patch use the new scu_spec_linefills_enable()
> function. Enabling SCU Speculative linefills to L2 for Armada 375/38x
> was the reason of this series.
>
> 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
don't know of any platform where they are broken, then we should just
enable them. We can add these functions only if necessary later.

Rob
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