From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH] drm/radeon: Disable writeback by default on ppc
Date: Thu, 05 Dec 2013 12:39:31 +1100
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To: Alex Deucher <alexdeucher@gmail.com>
Cc: Maling list - DRI developers <dri-devel@lists.freedesktop.org>, Jerome Glisse <jglisse@redhat.com>, Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>, Brian King <brking@linux.vnet.ibm.com>
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On Wed, 2013-12-04 at 19:05 -0500, Alex Deucher wrote:

> > Setting CP_RB_CNTL.BUF_SWAP causes the CP to use the selected byte
> > swapping for just about everything accessed by the CP (rptr writeback,
> > indirect buffers, etc.).  Looks like the DMA ring supports and enables
> > rptr writeback as well (DMA_RB_CNTL.DMA_RPTR_WRITEBACK_SWAP_ENABLE) so
> > I think we can drop the swapping of the rptr writeback.
> >
> 
> Obvious patch attached.

This works all the way back to r300 ?

Cheers,
Ben.