linux-kernel - Re: [PATCH 2/5] arm: mvebu: Select DMA_BOUNCE when LPAE is selected in Kconfig

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Message-ID: <20130321191805.GM21478@lunn.ch>
Date:	Thu, 21 Mar 2013 20:18:05 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 2/5] arm: mvebu: Select DMA_BOUNCE when LPAE is selected
 in Kconfig

On Thu, Mar 21, 2013 at 05:26:15PM +0100, Gregory CLEMENT wrote:
> From: Lior Amsalem <alior@...vell.com>
> 
> For mvebu IOs are 32 bits and we have 40 bits memory due to LPAE so
> make sure we give 32 bits addresses to the IOs.

Hi Gregory, Lior

I don't really understand what this comment is supposed to mean. I
would of expect DMA and bounce to appear at least....

> Signed-off-by: Lior Amsalem <alior@...vell.com>
> Tested-by: Franklin <flin@...vell.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  arch/arm/mach-mvebu/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
> index 440b13e..617da94 100644
> --- a/arch/arm/mach-mvebu/Kconfig
> +++ b/arch/arm/mach-mvebu/Kconfig
> @@ -13,6 +13,7 @@ config ARCH_MVEBU
>  	select MVEBU_CLK_CORE
>  	select MVEBU_CLK_CPU
>  	select MVEBU_CLK_GATING
> +	select DMABOUNCE if ARM_LPAE
>  
>  if ARCH_MVEBU
>  
> -- 
> 1.7.9.5
> 
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