From: Chris Wilson Date: Mon, 12 Feb 2018 09:39:28 +0000 (+0000) Subject: drm/i915: Don't wake the device up to check if the engine is asleep X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=74d00d28a15c8452f65de0a9477b52d95639cc63;p=linux.git drm/i915: Don't wake the device up to check if the engine is asleep If the entire device is powered off, we can safely assume that the engine is also asleep (and idle). Reported-by: Tvrtko Ursulin Fixes: a091d4ee931b ("drm/i915: Hold a wakeref for probing the ring registers") Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180212093928.6005-1-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 0ad9184eba978..3efc589a7f37f 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -1464,7 +1464,9 @@ static bool ring_is_idle(struct intel_engine_cs *engine) struct drm_i915_private *dev_priv = engine->i915; bool idle = true; - intel_runtime_pm_get(dev_priv); + /* If the whole device is asleep, the engine must be idle */ + if (!intel_runtime_pm_get_if_in_use(dev_priv)) + return true; /* First check that no commands are left in the ring */ if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=