drm/i915: Avoid sleeping inside per-engine reset

Only sleep and repeat when asked for a full device reset (ALL_ENGINES)
and avoid using sleeping waits when asked for a per-engine reset. The
goal is to be able to use a per-engine reset from hardirq/softirq/timer
context. A consequence is that our individual wait timeouts are a
thousand times shorter, on the order of a hundred microseconds rather
than hundreds of millisecond. This may make hitting the timeouts more
common, but hopefully the fallover to the full-device reset will be
sufficient to pick up the pieces.

Note, that the sleeps inside older gen (pre-gen8) have been left as they
are only used in full device reset mode.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Michał Winiarski <[email protected]>
CC: Michel Thierry <[email protected]>
Cc: Jeff McGee <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Reviewed-by: Michel Thierry <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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