snd/hda, drm/i915: Track the display_power_status using a cookie

drm/i915 is tracking all wakeref owners with a cookie in order to
identify leaks. To that end, each rpm acquisition ops->get_power is
assigned a cookie which should be passed to ops->put_power to signify
its release (and removal from the list of wakeref owners). As snd/hda is
already using a bool to track current status of display_power extending
that to an unsigned long to hold the boolean cookie is a trivial
extension, and will quell all doubt that snd/hda is the cause of the
device runtime pm leaks.

v2: Keep using the power abstraction for local wakeref tracking.
v3: BUILD_BUG_ON impedance mismatch

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jani Nikula <jani.nikula@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190213152109.16997-1-chris@chris-wilson.co.uk

sound/hda/hdac_component.c

@@ -79,17 +79,23 @@ void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable)
 
 	if (bus->display_power_status) {
 		if (!bus->display_power_active) {
+			unsigned long cookie = -1;
+
 			if (acomp->ops->get_power)
-				acomp->ops->get_power(acomp->dev);
+				cookie = acomp->ops->get_power(acomp->dev);
+
 			snd_hdac_set_codec_wakeup(bus, true);
 			snd_hdac_set_codec_wakeup(bus, false);
-			bus->display_power_active = true;
+			bus->display_power_active = cookie;
 		}
 	} else {
 		if (bus->display_power_active) {
+			unsigned long cookie = bus->display_power_active;
+
 			if (acomp->ops->put_power)
-				acomp->ops->put_power(acomp->dev);
-			bus->display_power_active = false;
+				acomp->ops->put_power(acomp->dev, cookie);
+
+			bus->display_power_active = 0;
 		}
 	}
 }
@@ -325,9 +331,9 @@ int snd_hdac_acomp_exit(struct hdac_bus *bus)
 		return 0;
 
 	if (WARN_ON(bus->display_power_active) && acomp->ops)
-		acomp->ops->put_power(acomp->dev);
+		acomp->ops->put_power(acomp->dev, bus->display_power_active);
 
-	bus->display_power_active = false;
+	bus->display_power_active = 0;
 	bus->display_power_status = 0;
 
 	component_master_del(dev, &hdac_component_master_ops);