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

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Date:	Wed, 24 Oct 2012 08:53:19 +0800
From:	Hein Tibosch <hein_tibosch@...oo.es>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	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>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	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

Hi Andrew,

On 10/24/2012 7:12 AM, Andrew Morton wrote:
> On Sun, 14 Oct 2012 15:54:13 +0800
> Hein Tibosch <hein_tibosch@...oo.es> wrote:
>
>> 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
> Do we think this bug should be fixed in earlier kernel versions?
>
> If so, the patch might need to be tweaked for 3.6 and earlier, which
> don't have the dma_read_byaddr() definition.

The 'bug' only affected avr32 (AP700x) users. I think there won't be much demand
for it. Beside that, there were more breakages after 2.6.38, which have only
recently been fixed in 3.7-rc1

These patches should then be back-ported as well:

 http://www.spinics.net/lists/linux-mmc/msg16104.html
 http://www.gossamer-threads.com/lists/linux/kernel/1603537

Thanks, Hein
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