drm/i915: Report engines are idle if already parked
authorChris Wilson <chris@chris-wilson.co.uk>
Wed, 27 Feb 2019 21:41:59 +0000 (21:41 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 28 Feb 2019 09:16:39 +0000 (09:16 +0000)
commitbd2be1418659abd7b1cdecc7d23d86314b0e3496
tree8069a72e36d4dd58e2904189d45dec885456c014
parent44f8b8022d4cde821819397e9f9f57eb30c51f93
drm/i915: Report engines are idle if already parked

If we have parked, then we must have passed an idleness test and still
be idle. We chose not to use this shortcut in the past so that we could
use the idleness test at any time and inspect HW. However, some HW like
Sandybridge, doesn't like being woken up frivolously, so avoid doing so.

References: 0b702dca2658 ("drm/i915: Avoid waking the engines just to check if they are idle")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190227214159.7946-1-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/intel_engine_cs.c