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:

quoted

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