linux-kernel - Re: [PATCH] drivers/block/xsysace - replace in(out)_8/in(out)_be16/in(out)

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Date:	Wed, 06 Feb 2013 08:01:33 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Michal Simek <monstr@...str.eu>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	alan@...rguk.ukuu.org.uk, geert@...ux-m68k.org,
	dahinds@...rs.sourceforge.net
Subject: Re: [PATCH] drivers/block/xsysace - replace
 in(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be)

On Tue, 2013-02-05 at 16:12 +0100, Arnd Bergmann wrote:
> Ok. In this case, I would recommend making the default for this driver
> little-endian, and adding a quirk for broken hardware bridges like the
> one you cited to have a mixed-endian mode if configured so at compile
> time.
> 
> It seems that on all normal platforms, this device should behave as
> little-endian, while the Xilinx bridge can be either big-endian
> or little-endian, depending on whether it is used in 8-bit or 16-bit
> mode, so if we are using this, it cannot be known at compile time.

Why ? 8-bit devices shouldn't need anything special. 16-bit should be
wired properly to not need anything special either. Why would we bother
supporting a bad wiring ? Let them feel the pain, with luck it will
provide incentive for them to fix it.

Ben.


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