drm/radeon: enable pci bus mastering after card is initialised (v2)
This closes a race seen with kexec where we enable PCI bus mastering but the card has been reinitialised fully yet. This was previously fixed by a patch from Jerome, but this should close the race completely. v2: add SI support as suggested by Alex. Reported-and-tested-by: NMarkus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: NDave Airlie <airlied@redhat.com>
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