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

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH V3 11/16] drm/radeon: Make radeon card usable for Loongson.
From: Huacai Chen <chenhuacai@gmail.com>
Date: Sat, 23 Jun 2012 08:46:59 +0800
Cc: Arnaud Patard <arnaud.patard@rtp-net.org>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Fuxin Zhang <zhangfx@lemote.com>, Zhangjin Wu <wuzhangjin@gmail.com>, Huacai Chen <chenhc@lemote.com>, Hongliang Tao <taohl@lemote.com>, Hua Yan <yanh@lemote.com>, dri-devel@lists.freedesktop.org
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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

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