ALSA: x86: Implement runtime PM
Although the driver has some PM callbacks, it doesn't do it right:
- the suspend callback doesn't handle to suspend the running PCM,
- the runtime PM ops are missing,
- pm_runtime_get_sync() isn't used at the right place.
This patch covers the above and provides the basic runtime PM
functionality.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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