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

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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

8e3f1b1d82 (Russell Currey)

and

253fd51e2f (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

...

This commit is contained in:

Ben Crocker 2018-02-22 17:52:19 -05:00 • committed by Alex Deucher

parent 421334a847

commit bcb0b981c5

1 changed files with 4 additions and 0 deletions

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drivers/gpu/drm/radeon/radeon_device.c

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