From ed610af86a717152be5aa5e29410c5183992b4f2 Mon Sep 17 00:00:00 2001 From: Pierre-Louis Bossart Date: Fri, 6 Feb 2015 15:55:52 -0600 Subject: [PATCH] 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 Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_controller.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c index 27dcb142f596..dfcb5e929f9f 100644 --- a/sound/pci/hda/hda_controller.c +++ b/sound/pci/hda/hda_controller.c @@ -657,6 +657,9 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 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; -- 2.39.2