From: David Miller <davem@davemloft.net>
Date: Thu, 12 Feb 2009 10:15:34 +0000 (-0800)
Subject: drm: ati_pcigart: Need to use PCI_DMA_BIDIRECTIONAL.
X-Git-Tag: v2.6.30-rc1~613^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=296c6ae0e9b5ced1060b43a68b5f7e41a18509f6;p=pandora-kernel.git

drm: ati_pcigart: Need to use PCI_DMA_BIDIRECTIONAL.

The buffers mapped by the PCI GART can be written to by the device,
not just read.

For example, this happens via the RB_RPTR writeback on Radeon.

So we can't use PCI_DMA_TODEVICE else we'll get protection faults
on IOMMU platforms.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
---

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