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

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Message-ID: <514B4F3F.8000308@gmail.com>
Date:	Thu, 21 Mar 2013 13:19:43 -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>,
	Lior Amsalem <alior@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	David Marlin <dmarlin@...hat.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jon Masters <jcm@...hat.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	Chris Van Hoof <vanhoof@...onical.com>,
	linux-kernel@...r.kernel.org, Maen Suleiman <maen@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>
Subject: Re: [PATCH 2/5] arm: mvebu: Select DMA_BOUNCE when LPAE is selected
 in Kconfig

On 03/21/2013 11:26 AM, 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.
> 
> 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

This alone is not enough to use bounce buffers. Am I missing something?

Rob

>  
>  if ARCH_MVEBU
>  
> 

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