3 files changed, 34 insertions, 9 deletions

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 93d7ca502730..db3d7e934ec3 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -188,7 +188,7 @@ static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *subs
         snd_pcm_sframes_t delta;
 
         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
-                getnstimeofday((struct timespec *)&runtime->status->tstamp);
+                snd_pcm_gettime(runtime, (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 6245bdaffa68..cdeae7c46e3b 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -598,9 +598,9 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
                         status->tstamp = runtime->status->tstamp;
                 else
-                        getnstimeofday(&status->tstamp);
+                        snd_pcm_gettime(runtime, &status->tstamp);
         } else
-                getnstimeofday(&status->tstamp);
+                snd_pcm_gettime(runtime, &status->tstamp);
         status->appl_ptr = runtime->control->appl_ptr;
         status->hw_ptr = runtime->status->hw_ptr;
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
@@ -688,7 +688,7 @@ static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
         if (runtime->trigger_master == NULL)
                 return;
         if (runtime->trigger_master == substream) {
-                getnstimeofday(&runtime->trigger_tstamp);
+                snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
         } else {
                 snd_pcm_trigger_tstamp(runtime->trigger_master);
                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
@@ -2519,6 +2519,21 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
                 return -EFAULT;
         return 0;
 }
+
+static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int arg;
+        
+        if (get_user(arg, _arg))
+                return -EFAULT;
+        if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
+                return -EINVAL;
+        runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
+        if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
+                runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
+        return 0;
+}
                 
 static int snd_pcm_common_ioctl1(struct file *file,
                                  struct snd_pcm_substream *substream,
@@ -2531,8 +2546,8 @@ static int snd_pcm_common_ioctl1(struct file *file,
                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
         case SNDRV_PCM_IOCTL_INFO:
                 return snd_pcm_info_user(substream, arg);
-        case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
-                return 0;
+        case SNDRV_PCM_IOCTL_TTSTAMP:
+                return snd_pcm_tstamp(substream, arg);
         case SNDRV_PCM_IOCTL_HW_REFINE:
                 return snd_pcm_hw_refine_user(substream, arg);
         case SNDRV_PCM_IOCTL_HW_PARAMS:
diff --git a/sound/core/timer.c b/sound/core/timer.c
index e7dc56ca4b97..7e5fe2d91662 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -44,11 +44,14 @@
 #endif
 
 static int timer_limit = DEFAULT_TIMER_LIMIT;
+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;