From: Alex Deucher alexander.deucher@amd.com
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 --- drivers/gpu/drm/radeon/radeon_device.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index b51e157..2c3429d 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -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;