From: Alex Deucher <alexander.deuc...@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 at amd.com>
Cc: Chen Jie <chenj at 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;
--
1.7.1.1
