linux-kernel - Re: simple framebuffer slower by factor of 20, on socfpga (arm) platform

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Message-ID: <alpine.LFD.2.11.1504281127200.1582@knanqh.ubzr>
Date:	Tue, 28 Apr 2015 11:28:53 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Pavel Machek <pavel@....cz>,
	Archit Taneja <architt@...eaurora.org>,
	Marek Vasut <marek.vasut@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Rob Clark <robdclark@...il.com>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Alexander Shiyan <shc_work@...l.ru>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>
Subject: Re: simple framebuffer slower by factor of 20, on socfpga (arm)
 platform

On Tue, 28 Apr 2015, Russell King - ARM Linux wrote:

> On Fri, Apr 24, 2015 at 03:46:56PM +0200, Geert Uytterhoeven wrote:
> > So please optimize ARM's _memcpy_fromio(), _memcpy_toio(), and _memset_io().
> > That will benefit other drivers on ARM, too.
> 
> That's not going to happen.
> 
> I've had a patch which does that, but people are concerned that it changes
> the behaviour of the functions by changing the access size, which could
> cause regressions.  It seems people are far too worried about that to even
> consider trying. :(

What about making the optimized implementation available via kconfig?


Nicolas
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