drm/radeon/kms: fix for radeon on systems >4GB without hardware iommu

On my x86_64 system with >4GB of ram and swiotlb instead of
a hardware iommu (because I have a VIA chipset), the call
to pci_set_dma_mask (see below) with 40bits returns an error.

But it seems that the radeon driver is designed to have
need_dma32 = true exactly if pci_set_dma_mask is called
with 32 bits and false if it is called with 40 bits.

I have read somewhere that the default are 32 bits. So if the
call fails I suppose that need_dma32 should be set to true.

And indeed the patch fixes the problem I have had before
and which I had described here:
http://choon.net/forum/read.php?21,106131,115940

Acked-by: Alex Deucher <alexdeucher@gmail.com>
cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index d77ede3e67ce..e680501c78ea 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -754,6 +754,7 @@ int radeon_device_init(struct radeon_device *rdev,
         dma_bits = rdev->need_dma32 ? 32 : 40;
         r = pci_set_dma_mask(rdev->pdev, DMA_BIT_MASK(dma_bits));
         if (r) {
+                rdev->need_dma32 = true;
                 printk(KERN_WARNING "radeon: No suitable DMA available.\n");
         }