From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: [PATCH v2 03/10] ALSA: hda: read trigger_timestamp immediately after starting DMA
Date: Fri, 19 Dec 2014 11:25:06 -0600 [thread overview]
Message-ID: <1419009913-3686-4-git-send-email-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <1419009913-3686-1-git-send-email-pierre-louis.bossart@linux.intel.com>
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>
---
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 8337645..9ad9454 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 = 1;
+
if (nsync > 1) {
cycle_t cycle_last;
--
1.9.1
next prev parent reply other threads:[~2014-12-19 17:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-19 17:25 [PATCH v2 00/10] audio timestamping evolutions Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 01/10] ALSA: core: don't override timestamp unconditionally Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 02/10] ALSA: core: allow for trigger_tstamp snapshot in .trigger Pierre-Louis Bossart
2014-12-19 17:25 ` Pierre-Louis Bossart [this message]
2014-12-19 17:25 ` [PATCH v2 04/10] ALSA: usb: update trigger timestamp on first non-zero URB submitted Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 05/10] ALSA: core: add info_ext field in hw_params and pcm_hardware Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 06/10] ALSA: core: selection of audio_tstamp type and accuracy reports Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 07/10] ALSA: core: pass audio tstamp config from userspace Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 08/10] ALSA: core: pass audio tstamp config from userspace in compat mode Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 09/10] ALSA: core: replace .wall_clock by .get_time_info Pierre-Louis Bossart
2014-12-19 17:25 ` [PATCH v2 10/10] ALSA: hda: replace .wallclock " Pierre-Louis Bossart
2014-12-20 6:07 ` Raymond Yau
2014-12-20 17:50 ` Pierre-Louis Bossart
2014-12-19 20:38 ` [PATCH v2 00/10] audio timestamping evolutions Jaroslav Kysela
2014-12-19 21:17 ` Pierre-Louis Bossart
2014-12-21 13:14 ` Jaroslav Kysela
2014-12-26 11:12 ` Takashi Iwai
2015-01-05 21:11 ` Pierre-Louis Bossart
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