drm/i915: Accurately track when we mark the hardware as idle/busy
We currently call intel_mark_idle() too often, as we do so as a side-effect of processing the request queue. However, we the calls to intel_mark_idle() are expected to be paired with a call to intel_mark_busy() (or else we try to idle the hardware by accessing registers that are already disabled). Make the idle/busy tracking explicit to prevent the multiple calls. v2: We can drop some of the complexity in __i915_add_request() as queue_delayed_work() already behaves as we want (not requeuing the item if it is already in the queue) and mark_busy/mark_idle imply that the idle task is inactive. v3: We do still need to cancel the pending idle task so that it is sent again after the current busy load completes (not in the middle of it). Reported-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Tested-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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