linux-kernel - Re: [PATCH REGRESSION FIX] dw_dmac: make driver's endianness configurable

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Message-Id: <201210141909.34098.arnd@arndb.de>
Date:	Sun, 14 Oct 2012 19:09:33 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Hein Tibosch <hein_tibosch@...oo.es>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	viresh kumar <viresh.kumar@...aro.org>,
	"spear-devel" <spear-devel@...t.st.com>,
	"Hans-Christian Egtvedt" <egtvedt@...fundet.no>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"ludovic.desroches" <ludovic.desroches@...el.com>,
	Havard Skinnemoen <havard@...nnemoen.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: Re: [PATCH REGRESSION FIX] dw_dmac: make driver's endianness configurable

On Sunday 14 October 2012, Hein Tibosch wrote:
> From: Hein Tibosch <hein_tibosch@...oo.es>
> 
> The dw_dmac was originally developed for avr32 to be used with the Synopsys
> DesignWare AHB DMA controller. Starting from 2.6.38, access to the device's i/o
> memory was done with the little-endian readl/writel functions(1)
> 
> This broke the driver for the avr32 platform, because it needs big (native)
> endian accessors.
> This patch makes the endianness configurable using 'DW_DMAC_BIG_ENDIAN_IO',
> which will default be true for AVR32
> 
> I submitted this patch before(2) but then waited for Andy to finish other
> changes to the same module(3).
> 
> (1) https://patchwork.kernel.org/patch/608211
> (2) https://lkml.org/lkml/2012/8/26/148
> (3) https://lkml.org/lkml/2012/9/21/173
> 
> Signed-off-by: Hein Tibosch <hein_tibosch@...oo.es>

Acked-by: Arnd Bergmann <arnd@...db.de>
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