From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 23 Nov 2007 12:14:23 +0000 (+0100)
Subject: [ALSA] Fix PCM MMAP time-stamp mode
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7c7fc2d44b7a660846115e65b67772b6742a14d8;p=openwrt%2Fstaging%2Fblogic.git

[ALSA] Fix PCM MMAP time-stamp mode

When MMAP time-stamp mode is given, it's supposed to update the time-stamp
only at period boundary.  However, it currently updates at each status call
so this is just useless.  The patch fixes this misbehavior.
Also it fixes the wrong check of tstamp_mode (don't use bit-and for enum).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 806f1fba5446..93d7ca502730 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -148,8 +148,6 @@ static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substre
 	pos = substream->ops->pointer(substream);
 	if (pos == SNDRV_PCM_POS_XRUN)
 		return pos; /* XRUN */
-	if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
-		getnstimeofday((struct timespec *)&runtime->status->tstamp);
 #ifdef CONFIG_SND_DEBUG
 	if (pos >= runtime->buffer_size) {
 		snd_printk(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
@@ -189,6 +187,8 @@ static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *subs
 	snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
 	snd_pcm_sframes_t delta;
 
+	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
+		getnstimeofday((struct timespec *)&runtime->status->tstamp);
 	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 	if (pos == SNDRV_PCM_POS_XRUN) {
 		xrun(substream);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index fb3dde4db045..6245bdaffa68 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -595,7 +595,7 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
 	status->trigger_tstamp = runtime->trigger_tstamp;
 	if (snd_pcm_running(substream)) {
 		snd_pcm_update_hw_ptr(substream);
-		if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
+		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
 			status->tstamp = runtime->status->tstamp;
 		else
 			getnstimeofday(&status->tstamp);