Sam Bobroff 62d91dd285
drm/radeon: fix bad DMA from INTERRUPT_CNTL2 ...
The INTERRUPT_CNTL2 register expects a valid DMA address, but is
currently set with a GPU MC address. This can cause problems on
systems that detect the resulting DMA read from an invalid address
(found on a Power8 guest).
Instead, use the DMA address of the dummy page because it will always
be safe.
Fixes: d8f60cfc9325a857fbe9a59781bbe5sbobroff@linux.ibm.com >
Signed-off-by: Alex Deucher <alexander.deucher@amd.com >
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