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ALSA: lola - Add sync in loop implementation

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For assuring the synchronized state with the pause operation,
loop over the all linked streams and waits until all get ready
in a loop.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2011-05-03 17:02:35 +02:00
parent 7e79f22676
commit c7aad3c317
1 changed files with 59 additions and 17 deletions
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76
sound/pci/lola/lola_pcm.c
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@ -121,27 +121,69 @@ static int lola_stream_wait_for_fifo(struct lola *chip,
return -EIO;
}
/* sync for FIFO ready/empty for all linked streams;
* clear paused flag when FIFO gets ready again
*/
static int lola_sync_wait_for_fifo(struct lola *chip,
struct snd_pcm_substream *substream,
bool ready)
{
unsigned int val = ready ? LOLA_DSD_STS_FIFORDY : 0;
unsigned long end_time = jiffies + msecs_to_jiffies(200);
struct snd_pcm_substream *s;
int pending = 0;
while (time_before(jiffies, end_time)) {
pending = 0;
snd_pcm_group_for_each_entry(s, substream) {
struct lola_stream *str;
if (s->pcm->card != substream->pcm->card)
continue;
str = lola_get_stream(s);
if (str->prepared && str->paused) {
unsigned int reg;
reg = lola_dsd_read(chip, str->dsd, STS);
if ((reg & LOLA_DSD_STS_FIFORDY) != val) {
pending = str->dsd + 1;
break;
}
if (ready)
str->paused = 0;
}
}
if (!pending)
return 0;
msleep(1);
}
printk(KERN_WARNING SFX "FIFO not ready (pending %d)\n", pending - 1);
return -EIO;
}
/* finish pause - prepare for a new resume */
static void lola_sync_pause(struct lola *chip,
struct snd_pcm_substream *substream)
{
struct snd_pcm_substream *s;
lola_sync_wait_for_fifo(chip, substream, false);
snd_pcm_group_for_each_entry(s, substream) {
struct lola_stream *str;
if (s->pcm->card != substream->pcm->card)
continue;
str = lola_get_stream(s);
if (str->paused && str->prepared)
lola_dsd_write(chip, str->dsd, CTL, LOLA_DSD_CTL_SRUN |
LOLA_DSD_CTL_IOCE | LOLA_DSD_CTL_DEIE);
}
lola_sync_wait_for_fifo(chip, substream, true);
}
static void lola_stream_reset(struct lola *chip, struct lola_stream *str)
{
if (str->prepared) {
if (str->paused)
lola_sync_pause(chip, str->substream);
str->prepared = 0;
if (str->paused) {
/* finish pause - prepare for a new resume
* move this code later to trigger function,
* as this is also needed when resuming from pause
*/
str->paused = 0;
/* implement later loop for all streams */
lola_stream_wait_for_fifo(chip, str, false);
lola_dsd_write(chip, str->dsd, CTL, LOLA_DSD_CTL_SRUN |
LOLA_DSD_CTL_IOCE | LOLA_DSD_CTL_DEIE);
/* end loop */
/* implement later once more loop for all streams */
lola_stream_wait_for_fifo(chip, str, true);
/* end loop */
/* end finish pause */
}
lola_dsd_write(chip, str->dsd, CTL,
LOLA_DSD_CTL_IOCE | LOLA_DSD_CTL_DEIE);
lola_stream_wait_for_fifo(chip, str, false);