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

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Message-ID: <CAAhV-H6nbB_QNC9Qm0AwgNeUyWK7iRQmKQRLNXiEjHR1Zdyejw@mail.gmail.com>
Date:	Sat, 23 Jun 2012 08:46:59 +0800
From:	Huacai Chen <chenhuacai@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Arnaud Patard <arnaud.patard@...-net.org>,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Huacai Chen <chenhc@...ote.com>,
	Hongliang Tao <taohl@...ote.com>, Hua Yan <yanh@...ote.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH V3 11/16] drm/radeon: Make radeon card usable for Loongson.

On Fri, Jun 22, 2012 at 7:11 PM, Ralf Baechle <ralf@...ux-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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