drm/radeon: insist on 32-bit DMA for Cedar on PPC64/PPC64LE

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

5940d76a7463b52630b4ad1a6aedc66a08ab97e4 (Russell Currey)

and

0c703bca39114cc8334ea117e512a5b06a2f67f4 (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@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 7f40c6f7c4dd866552ec627c640d159be085bb96..e415d2c097a70244ea26bbee949014623f48e7fc 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1366,6 +1366,10 @@ int radeon_device_init(struct radeon_device *rdev,
        if ((rdev->flags & RADEON_IS_PCI) &&
            (rdev->family <= CHIP_RS740))
                rdev->need_dma32 = true;
+#ifdef CONFIG_PPC64
+       if (rdev->family == CHIP_CEDAR)
+               rdev->need_dma32 = true;
+#endif
 
        dma_bits = rdev->need_dma32 ? 32 : 40;
        r = pci_set_dma_mask(rdev->pdev, DMA_BIT_MASK(dma_bits));