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

From: Nicolas Pitre
Date: Tue Apr 28 2015 - 11:29:13 EST

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?

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