[PATCH] drm/radeon: insist on 32-bit DMA for Cedar

[Ben Crocker]

In radeon_device_init, set the need_dma32 flag for Cedar chips
(e.g. FirePro 2270).  This fixes, or at least works around, a bug
on PowerPC exposed by last year's commits

8e3f1b1d8255105f31556aacf8aeb6071b00d469 (Russell Currey)

and

253fd51e2f533552ae35a0c661705da6c4842c1b (Alistair Popple)

which enabled the 64-bit DMA iommu bypass.

This caused the device to freeze, in some cases unrecoverably, and is
the subject of several bug reports internal to Red Hat.

Signed-off-by: Ben Crocker <bcrocker at redhat.com>
---
 drivers/gpu/drm/radeon/radeon_device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index ffc10cadcf34..02538903830d 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1395,7 +1395,10 @@ int radeon_device_init(struct radeon_device *rdev,
 	if (rdev->flags & RADEON_IS_AGP)
 		rdev->need_dma32 = true;
 	if ((rdev->flags & RADEON_IS_PCI) &&
-	    (rdev->family <= CHIP_RS740))
+	    (rdev->family <= CHIP_RS740 || rdev->family == CHIP_CEDAR))
+		rdev->need_dma32 = true;
+	if ((rdev->flags & RADEON_IS_PCIE) &&
+	    (rdev->family == CHIP_CEDAR))
 		rdev->need_dma32 = true;
 
 	dma_bits = rdev->need_dma32 ? 32 : 40;
-- 
2.13.6