Re: [PATCH V3 11/16] drm/radeon: Make radeon card usable for Loongson.

[Huacai Chen <chenhuacai@gmail.com>]

On Fri, Jun 22, 2012 at 7:11 PM, Ralf Baechle <ralf@linux-mips.org> wrote:
> On Fri, Jun 22, 2012 at 06:55:40PM +0800, Huacai Chen wrote:
>
>> > btw, would it be a good idea to use uncached accelerated instead ?
>> I have tried uncached accelerated, there will be random points in the
>> monitor, it seems a hw issue...
>
> Have you flushed the pages from memory before switching their cache mode
> to uncached accelerated?  The MIPS architecture defines the result of
> mixing cache modes as UNPREDICTABLE so be careful to flush caches before
> switching cache mode of a page.
Not because of flushing, CPU designing team told us a method but very
complex, and that method will cause other performance drop. So, we
won't use uncached accelerate mode.
>
>  Ralf