drm/i915: Reset engine->last_submitted_seqno
When we change the current seqno, we also need to remember to reset the last_submitted_seqno for the engine. Testcase: igt/gem_exec_whisper Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460010558-10705-7-git-send-email-chris@chris-wilson.co.uk
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