ALSA: hda: read trigger_timestamp immediately after starting DMA
Make sure wallclock counter and trigger timestamp are read very
close to each other for better alignment.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 27dcb14..dfcb5e9 100644
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -657,6 +657,9 @@
azx_writel(chip, SSYNC, azx_readl(chip, SSYNC) & ~sbits);
if (start) {
azx_timecounter_init(substream, 0, 0);
+ snd_pcm_gettime(substream->runtime, &substream->runtime->trigger_tstamp);
+ substream->runtime->trigger_tstamp_latched = true;
+
if (nsync > 1) {
cycle_t cycle_last;