drm/nouveau/fifo: add chan start()/stop()
- nvkm_chan_error() built on top, stops channel and sends 'killed' event - removes an odd double-bashing of channel enable regs on kepler and up - pokes doorbell on turing and up, after enabling channel Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Reviewed-by: Lyude Paul <lyude@redhat.com>
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