diff options
| author | Daniel Haid <d.haid@gogi.tv> | 2011-06-08 20:04:45 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-23 15:05:35 -0700 |
| commit | 473e5a1d28fc1842fd9714a97d46af2c6b6fc1b0 (patch) | |
| tree | c17ab822b86dee0a6c9d630f04336a0e28cd268a /drivers | |
| parent | a9f1135fc0a404146e3147a921a19b7a312c5642 (diff) | |
drm/radeon/kms: fix for radeon on systems >4GB without hardware iommu
commit 62fff811d73095bd95579d72f558f03c78f7914a upstream.
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>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_device.c | 1 |
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 890217e678d3..5d6ccc3efe33 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -752,6 +752,7 @@ 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"); } |