X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=sound%2Fcore%2Ftimer.c;h=7e5fe2d9166233b0874dc5a97c8f930c214e27c8;hb=fa5717f2099aadb2083d5df4d19af8f9685fa03e;hp=f2bbacedd567eedb518c628e33fbdd8dd3691351;hpb=7c64ec343a7d7b2d73b19e6bb8d9fd15f0462890;p=linux-2.6

diff --git a/sound/core/timer.c b/sound/core/timer.c
index f2bbacedd5..7e5fe2d916 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1,6 +1,6 @@
 /*
  *  Timers abstract layer
- *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  *
  *
  *   This program is free software; you can redistribute it and/or modify
@@ -44,11 +44,14 @@
 #endif
 
 static int timer_limit = DEFAULT_TIMER_LIMIT;
-MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>");
+static int timer_tstamp_monotonic = 1;
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>");
 MODULE_DESCRIPTION("ALSA timer interface");
 MODULE_LICENSE("GPL");
 module_param(timer_limit, int, 0444);
 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system.");
+module_param(timer_tstamp_monotonic, int, 0444);
+MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default).");
 
 struct snd_timer_user {
 	struct snd_timer_instance *timeri;
@@ -381,7 +384,10 @@ static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
 	struct snd_timer_instance *ts;
 	struct timespec tstamp;
 
-	getnstimeofday(&tstamp);
+	if (timer_tstamp_monotonic)
+		do_posix_clock_monotonic_gettime(&tstamp);
+	else
+		getnstimeofday(&tstamp);
 	snd_assert(event >= SNDRV_TIMER_EVENT_START &&
 		   event <= SNDRV_TIMER_EVENT_PAUSE, return);
 	if (event == SNDRV_TIMER_EVENT_START ||
@@ -1182,8 +1188,12 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
 		spin_unlock(&tu->qlock);
 		return;
 	}
-	if (tu->last_resolution != resolution || ticks > 0)
-		getnstimeofday(&tstamp);
+	if (tu->last_resolution != resolution || ticks > 0) {
+		if (timer_tstamp_monotonic)
+			do_posix_clock_monotonic_gettime(&tstamp);
+		else
+			getnstimeofday(&tstamp);
+	}
 	if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
 	    tu->last_resolution != resolution) {
 		r1.event = SNDRV_TIMER_EVENT_RESOLUTION;