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

To: Huacai Chen <chenhuacai@gmail.com>
Subject: Re: [PATCH V3 11/16] drm/radeon: Make radeon card usable for Loongson.
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 22 Jun 2012 12:11:32 +0100
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 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.

  Ralf

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