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drm/radeon/kms: set DMA mask properly on newer PCI asics 

If a card wasn't PCIE, we always set the DMA mask to 32 bits.
This is only applies to the old rage128/r1xx gart block on
early radeon asics (~r1xx-r4xx).  Newer PCI and IGP cards
can handle 40 bits just fine.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Chen Jie <chenj@lemote.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-10-05 10:02:57 -04:00 committed by Dave Airlie
parent c245cb9e15
commit 005a83f141
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/radeon/radeon_device.c
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@ -750,14 +750,15 @@ int radeon_device_init(struct radeon_device *rdev,
/* set DMA mask + need_dma32 flags.
* PCIE - can handle 40-bits.
* IGP - can handle 40-bits (in theory)
* IGP - can handle 40-bits
* AGP - generally dma32 is safest
* PCI - only dma32
* PCI - dma32 for legacy pci gart, 40 bits on newer asics
*/
rdev->need_dma32 = false;
if (rdev->flags & RADEON_IS_AGP)
rdev->need_dma32 = true;
if (rdev->flags & RADEON_IS_PCI)
if ((rdev->flags & RADEON_IS_PCI) &&
(rdev->family < CHIP_RS400))
rdev->need_dma32 = true;
dma_bits = rdev->need_dma32 ? 32 : 40;