[ALSA] Remove PCM sleep_min and tick

The 'tick' in PCM is set (again) via sw_params.  And, nobody uses
this feature at all except for a command line option of aplay.
(This is literally 'nobody', as I checked alsa-lib API calls in all
 programs in major distros.)
Above all, if we need finer wake-ups for the position update, it's
basically an issue that the driver should solve, not tuned by each
application.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

include/sound/pcm.h

@@ -274,7 +274,6 @@ struct snd_pcm_runtime {
 	snd_pcm_uframes_t period_size;	/* period size */
 	unsigned int periods;		/* periods */
 	snd_pcm_uframes_t buffer_size;	/* buffer size */
-	unsigned int tick_time;		/* tick time */
 	snd_pcm_uframes_t min_align;	/* Min alignment for the format */
 	size_t byte_align;
 	unsigned int frame_bits;
@@ -286,7 +285,6 @@ struct snd_pcm_runtime {
 	/* -- SW params -- */
 	int tstamp_mode;		/* mmap timestamp is updated */
   	unsigned int period_step;
-	unsigned int sleep_min;		/* min ticks to sleep */
 	snd_pcm_uframes_t start_threshold;
 	snd_pcm_uframes_t stop_threshold;
 	snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
@@ -305,7 +303,6 @@ struct snd_pcm_runtime {
 
 	/* -- locking / scheduling -- */
 	wait_queue_head_t sleep;
-	struct timer_list tick_timer;
 	struct fasync_struct *fasync;
 
 	/* -- private section -- */
@@ -810,7 +807,6 @@ static inline const struct snd_interval *hw_param_interval_c(const struct snd_pc
 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
-#define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
 
 
 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
@@ -908,9 +904,6 @@ int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
-void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
-void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
-void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 				    const void __user *buf,

sound/core/oss/pcm_oss.c

@@ -985,7 +985,6 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)
 		sw_params->stop_threshold = runtime->buffer_size;
 	sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 	sw_params->period_step = 1;
-	sw_params->sleep_min = 0;
 	sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 		1 : runtime->period_size;
 	if (atomic_read(&substream->mmap_count) ||

sound/core/pcm.c

@@ -359,7 +359,6 @@ static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 	snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);	
 	snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);	
 	snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);	
-	snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 	if (substream->oss.oss) {
 		snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
@@ -387,7 +386,6 @@ static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 	}
 	snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 	snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
-	snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 	snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 	snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 	snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
@@ -764,12 +762,6 @@ static int snd_pcm_dev_free(struct snd_device *device)
 	return snd_pcm_free(pcm);
 }
 
-static void snd_pcm_tick_timer_func(unsigned long data)
-{
-	struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
-	snd_pcm_tick_elapsed(substream);
-}
-
 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 			     struct file *file,
 			     struct snd_pcm_substream **rsubstream)
@@ -876,9 +868,6 @@ int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 	memset((void*)runtime->control, 0, size);
 
 	init_waitqueue_head(&runtime->sleep);
-	init_timer(&runtime->tick_timer);
-	runtime->tick_timer.function = snd_pcm_tick_timer_func;
-	runtime->tick_timer.data = (unsigned long) substream;
 
 	runtime->status->state = SNDRV_PCM_STATE_OPEN;
 

sound/core/pcm_lib.c

@@ -1451,112 +1451,13 @@ int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 
 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
 
-/*
- *  Conditions
- */
-
-static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream, 
-				    unsigned long ticks)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	if (ticks == 0)
-		del_timer(&runtime->tick_timer);
-	else {
-		ticks += (1000000 / HZ) - 1;
-		ticks /= (1000000 / HZ);
-		mod_timer(&runtime->tick_timer, jiffies + ticks);
-	}
-}
-
-/* Temporary alias */
-void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks)
-{
-	snd_pcm_system_tick_set(substream, ticks);
-}
-
-void snd_pcm_tick_prepare(struct snd_pcm_substream *substream)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	snd_pcm_uframes_t frames = ULONG_MAX;
-	snd_pcm_uframes_t avail, dist;
-	unsigned int ticks;
-	u_int64_t n;
-	u_int32_t r;
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		if (runtime->silence_size >= runtime->boundary) {
-			frames = 1;
-		} else if (runtime->silence_size > 0 &&
-			   runtime->silence_filled < runtime->buffer_size) {
-			snd_pcm_sframes_t noise_dist;
-			noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
-			if (noise_dist > (snd_pcm_sframes_t)runtime->silence_threshold)
-				frames = noise_dist - runtime->silence_threshold;
-		}
-		avail = snd_pcm_playback_avail(runtime);
-	} else {
-		avail = snd_pcm_capture_avail(runtime);
-	}
-	if (avail < runtime->control->avail_min) {
-		snd_pcm_sframes_t to_avail_min =
-			runtime->control->avail_min - avail;
-		if (to_avail_min > 0 &&
-		    frames > (snd_pcm_uframes_t)to_avail_min)
-			frames = to_avail_min;
-	}
-	if (avail < runtime->buffer_size) {
-		snd_pcm_sframes_t to_buffer_size =
-			runtime->buffer_size - avail;
-		if (to_buffer_size > 0 &&
-		    frames > (snd_pcm_uframes_t)to_buffer_size)
-			frames = to_buffer_size;
-	}
-	if (frames == ULONG_MAX) {
-		snd_pcm_tick_set(substream, 0);
-		return;
-	}
-	dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
-	/* Distance to next interrupt */
-	dist = runtime->period_size - dist % runtime->period_size;
-	if (dist <= frames) {
-		snd_pcm_tick_set(substream, 0);
-		return;
-	}
-	/* the base time is us */
-	n = frames;
-	n *= 1000000;
-	div64_32(&n, runtime->tick_time * runtime->rate, &r);
-	ticks = n + (r > 0 ? 1 : 0);
-	if (ticks < runtime->sleep_min)
-		ticks = runtime->sleep_min;
-	snd_pcm_tick_set(substream, (unsigned long) ticks);
-}
-
-void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream)
-{
-	struct snd_pcm_runtime *runtime;
-	unsigned long flags;
-	
-	snd_assert(substream != NULL, return);
-	runtime = substream->runtime;
-	snd_assert(runtime != NULL, return);
-
-	snd_pcm_stream_lock_irqsave(substream, flags);
-	if (!snd_pcm_running(substream) ||
-	    snd_pcm_update_hw_ptr(substream) < 0)
-		goto _end;
-	if (runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
- _end:
-	snd_pcm_stream_unlock_irqrestore(substream, flags);
-}
-
 /**
  * snd_pcm_period_elapsed - update the pcm status for the next period
  * @substream: the pcm substream instance
  *
  * This function is called from the interrupt handler when the
  * PCM has processed the period size.  It will update the current
- * pointer, set up the tick, wake up sleepers, etc.
+ * pointer, wake up sleepers, etc.
  *
  * Even if more than one periods have elapsed since the last call, you
  * have to call this only once.
@@ -1580,8 +1481,6 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
 
 	if (substream->timer_running)
 		snd_timer_interrupt(substream->timer, 1);
-	if (runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
  _end:
 	snd_pcm_stream_unlock_irqrestore(substream, flags);
 	if (runtime->transfer_ack_end)
@@ -1715,7 +1614,7 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
 		snd_pcm_uframes_t cont;
-		if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 			snd_pcm_update_hw_ptr(substream);
 		avail = snd_pcm_playback_avail(runtime);
 		if (!avail) {
@@ -1764,9 +1663,6 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 			if (err < 0)
 				goto _end_unlock;
 		}
-		if (runtime->sleep_min &&
-		    runtime->status->state == SNDRV_PCM_STATE_RUNNING)
-			snd_pcm_tick_prepare(substream);
 	}
  _end_unlock:
 	snd_pcm_stream_unlock_irq(substream);
@@ -1923,7 +1819,7 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
 		snd_pcm_uframes_t cont;
-		if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 			snd_pcm_update_hw_ptr(substream);
 		avail = snd_pcm_capture_avail(runtime);
 		if (!avail) {
@@ -1973,9 +1869,6 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		offset += frames;
 		size -= frames;
 		xfer += frames;
-		if (runtime->sleep_min &&
-		    runtime->status->state == SNDRV_PCM_STATE_RUNNING)
-			snd_pcm_tick_prepare(substream);
 	}
  _end_unlock:
 	snd_pcm_stream_unlock_irq(substream);

sound/core/pcm_native.c

@@ -413,7 +413,6 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 	runtime->period_size = params_period_size(params);
 	runtime->periods = params_periods(params);
 	runtime->buffer_size = params_buffer_size(params);
-	runtime->tick_time = params_tick_time(params);
 	runtime->info = params->info;
 	runtime->rate_num = params->rate_num;
 	runtime->rate_den = params->rate_den;
@@ -433,7 +432,6 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 	/* Default sw params */
 	runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 	runtime->period_step = 1;
-	runtime->sleep_min = 0;
 	runtime->control->avail_min = runtime->period_size;
 	runtime->start_threshold = 1;
 	runtime->stop_threshold = runtime->buffer_size;
@@ -542,7 +540,6 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 	}
 	snd_pcm_stream_lock_irq(substream);
 	runtime->tstamp_mode = params->tstamp_mode;
-	runtime->sleep_min = params->sleep_min;
 	runtime->period_step = params->period_step;
 	runtime->control->avail_min = params->avail_min;
 	runtime->start_threshold = params->start_threshold;
@@ -551,10 +548,6 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 	runtime->silence_size = params->silence_size;
         params->boundary = runtime->boundary;
 	if (snd_pcm_running(substream)) {
-		if (runtime->sleep_min)
-			snd_pcm_tick_prepare(substream);
-		else
-			snd_pcm_tick_set(substream, 0);
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 		    runtime->silence_size > 0)
 			snd_pcm_playback_silence(substream, ULONG_MAX);
@@ -865,8 +858,6 @@ static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
 		snd_pcm_playback_silence(substream, ULONG_MAX);
-	if (runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 	if (substream->timer)
 		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 				 &runtime->trigger_tstamp);
@@ -920,7 +911,6 @@ static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 			snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 					 &runtime->trigger_tstamp);
 		runtime->status->state = state;
-		snd_pcm_tick_set(substream, 0);
 	}
 	wake_up(&runtime->sleep);
 }
@@ -1004,12 +994,9 @@ static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 			snd_timer_notify(substream->timer,
 					 SNDRV_TIMER_EVENT_MPAUSE,
 					 &runtime->trigger_tstamp);
-		snd_pcm_tick_set(substream, 0);
 		wake_up(&runtime->sleep);
 	} else {
 		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
-		if (runtime->sleep_min)
-			snd_pcm_tick_prepare(substream);
 		if (substream->timer)
 			snd_timer_notify(substream->timer,
 					 SNDRV_TIMER_EVENT_MCONTINUE,
@@ -1064,7 +1051,6 @@ static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
 				 &runtime->trigger_tstamp);
 	runtime->status->suspended_state = runtime->status->state;
 	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
-	snd_pcm_tick_set(substream, 0);
 	wake_up(&runtime->sleep);
 }
 
@@ -1167,8 +1153,6 @@ static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
 		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
 				 &runtime->trigger_tstamp);
 	runtime->status->state = runtime->status->suspended_state;
-	if (runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 }
 
 static struct action_ops snd_pcm_action_resume = {
@@ -1997,8 +1981,6 @@ int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
 	}
 
 	/* FIXME: this belong to lowlevel */
-	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
-				     1000000 / HZ, 1000000 / HZ);
 	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
 
 	return 0;
@@ -2238,9 +2220,6 @@ static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *subst
 	if (appl_ptr < 0)
 		appl_ptr += runtime->boundary;
 	runtime->control->appl_ptr = appl_ptr;
-	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
-	    runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 	ret = frames;
  __end:
 	snd_pcm_stream_unlock_irq(substream);
@@ -2286,9 +2265,6 @@ static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substr
 	if (appl_ptr < 0)
 		appl_ptr += runtime->boundary;
 	runtime->control->appl_ptr = appl_ptr;
-	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
-	    runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 	ret = frames;
  __end:
 	snd_pcm_stream_unlock_irq(substream);
@@ -2335,9 +2311,6 @@ static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *subs
 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
 		appl_ptr -= runtime->boundary;
 	runtime->control->appl_ptr = appl_ptr;
-	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
-	    runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 	ret = frames;
  __end:
 	snd_pcm_stream_unlock_irq(substream);
@@ -2384,9 +2357,6 @@ static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *subst
 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
 		appl_ptr -= runtime->boundary;
 	runtime->control->appl_ptr = appl_ptr;
-	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
-	    runtime->sleep_min)
-		snd_pcm_tick_prepare(substream);
 	ret = frames;
  __end:
 	snd_pcm_stream_unlock_irq(substream);