ALSA: hda: support for wallclock timestamps
Reuse code from clocksource to handle wall clock counter. Since wrapparound occurs, the audio timestamp is reinitialized to zero on a trigger. Synchronized linked devices will start counting from same reference to avoid any drift. Max buffer time is limited to 178 seconds to make sure wall clock counter does not overflow Wallclock timestamps are disabled on capture streams until we figure out how to handle digital inputs. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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