linux-kernel - Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign endianness

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Message-ID: <47BC4AAE.8020908@anagramm.de>
Date:	Wed, 20 Feb 2008 16:43:42 +0100
From:	Clemens Koller <clemens.koller@...gramm.de>
To:	linux-fbdev-devel@...ts.sourceforge.net
CC:	Andrew Morton <akpm@...ux-foundation.org>, adaplas@...il.com,
	benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign endianness

Paul Mackerras schrieb:
> Andrew Morton writes:
> 
>> Bizarrely, the original author of the patch (Anton) has fallen off the cc. 
>> Could whoever did that please thwap himself?
>>
>> Anyway, my head is now officially spinning.  Did anyone actually have a
>> reason why we shouldn't proceed with Anton's patch?
> 
> I was wondering if it would be sufficient to provide alternative
> versions of fb_readl, fb_writel etc. that do byte-swapping.  That
> would mean that all framebuffers would have to have the same
> endianness, but that would suffice for embedded systems such as
> Anton's and would end up a lot simpler IMHO.

Yes. At least the affected PowerPC platforms can do byte-swapping on
the fly, so this should be sufficient and without performance
penalty, AFAICS.

Regards,

Clemens
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