drm/radeon/kms: AGP systems need PCI bus mastering enabled

We might not hit this yet, but when if we do any sort of writeback
we really need to enable PCI bus mastering on these systems from
what I can see.

This enables PCI BM on all radeons that require it.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
index 2f43ee8e4048..9a5798544b42 100644
--- a/drivers/gpu/drm/radeon/r300.c
+++ b/drivers/gpu/drm/radeon/r300.c
@@ -1193,6 +1193,12 @@ static int r300_startup(struct radeon_device *rdev)
                 if (r)
                         return r;
         }
+
+        if (rdev->family == CHIP_R300 ||
+            rdev->family == CHIP_R350 ||
+            rdev->family == CHIP_RV350)
+                r100_enable_bm(rdev);
+
         if (rdev->flags & RADEON_IS_PCI) {
                 r = r100_pci_gart_enable(rdev);
                 if (r)