drm/nv50-nvc0: switch to tasklet for display isr bh

We need to be able to have the bh run while possibly spinning waiting for
the EVO notifier to signal.  This apparently happens in some circumstances
with preempt disabled, so our workqueue was never being run.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
3 files changed