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[ALSA] Remove PCM sleep_min and tick
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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 <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>
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@tiwai @perexg
tiwai authored and perexg committed Jan 31, 2008
1 parent 1307551 commit 31e8960
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Showing 5 changed files with 3 additions and 159 deletions.
7 changes: 0 additions & 7 deletions include/sound/pcm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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
Expand All @@ -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 -- */
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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,
Expand Down
1 change: 0 additions & 1 deletion sound/core/oss/pcm_oss.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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) ||
Expand Down
11 changes: 0 additions & 11 deletions sound/core/pcm.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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));
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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)
Expand Down Expand Up @@ -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;

Expand Down
113 changes: 3 additions & 110 deletions sound/core/pcm_lib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
Expand All @@ -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)
Expand Down Expand Up @@ -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) {
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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) {
Expand Down Expand Up @@ -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);
Expand Down
30 changes: 0 additions & 30 deletions sound/core/pcm_native.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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;
Expand Down Expand Up @@ -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;
Expand All @@ -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);
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
}
Expand Down Expand Up @@ -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,
Expand Down Expand Up @@ -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);
}

Expand Down Expand Up @@ -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 = {
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
Expand Down

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