[ALSA] hda_intel: fix unexpected ring buffer positions
I found two issues with ICH7-M (it should be related to other HDA chipsets
as well):
- the ring buffer position is not reset when stream restarts (after xrun) -
solved by moving azx_stream_reset() call from open() to prepare() callback
and reset posbuf to zero (it might be filled with hw later than position()
callback is called)
- irq_ignore flag should be set also when ring buffer memory area is not
changed in prepare() callback - this patch replaces irq_ignore with
more universal check based on jiffies clock
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 30829ee..6d3b927 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -312,6 +312,9 @@
unsigned int period_bytes; /* size of the period in bytes */
unsigned int frags; /* number for period in the play buffer */
unsigned int fifo_size; /* FIFO size */
+ unsigned int start_flag: 1; /* stream full start flag */
+ unsigned long start_jiffies; /* start + minimum jiffies */
+ unsigned long min_jiffies; /* minimum jiffies before position is valid */
void __iomem *sd_addr; /* stream descriptor pointer */
@@ -330,7 +333,6 @@
unsigned int opened :1;
unsigned int running :1;
unsigned int irq_pending :1;
- unsigned int irq_ignore :1;
/*
* For VIA:
* A flag to ensure DMA position is 0
@@ -975,7 +977,7 @@
struct azx *chip = dev_id;
struct azx_dev *azx_dev;
u32 status;
- int i;
+ int i, ok;
spin_lock(&chip->reg_lock);
@@ -991,18 +993,14 @@
azx_sd_writeb(azx_dev, SD_STS, SD_INT_MASK);
if (!azx_dev->substream || !azx_dev->running)
continue;
- /* ignore the first dummy IRQ (due to pos_adj) */
- if (azx_dev->irq_ignore) {
- azx_dev->irq_ignore = 0;
- continue;
- }
/* check whether this IRQ is really acceptable */
- if (azx_position_ok(chip, azx_dev)) {
+ ok = azx_position_ok(chip, azx_dev);
+ if (ok == 1) {
azx_dev->irq_pending = 0;
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(azx_dev->substream);
spin_lock(&chip->reg_lock);
- } else if (chip->bus && chip->bus->workq) {
+ } else if (ok == 0 && chip->bus && chip->bus->workq) {
/* bogus IRQ, process it later */
azx_dev->irq_pending = 1;
queue_work(chip->bus->workq,
@@ -1088,7 +1086,6 @@
bdl = (u32 *)azx_dev->bdl.area;
ofs = 0;
azx_dev->frags = 0;
- azx_dev->irq_ignore = 0;
pos_adj = bdl_pos_adj[chip->dev_index];
if (pos_adj > 0) {
struct snd_pcm_runtime *runtime = substream->runtime;
@@ -1109,7 +1106,6 @@
&bdl, ofs, pos_adj, 1);
if (ofs < 0)
goto error;
- azx_dev->irq_ignore = 1;
}
} else
pos_adj = 0;
@@ -1155,6 +1151,9 @@
while (((val = azx_sd_readb(azx_dev, SD_CTL)) & SD_CTL_STREAM_RESET) &&
--timeout)
;
+
+ /* reset first position - may not be synced with hw at this time */
+ *azx_dev->posbuf = 0;
}
/*
@@ -1409,7 +1408,6 @@
snd_pcm_set_sync(substream);
mutex_unlock(&chip->open_mutex);
- azx_stream_reset(chip, azx_dev);
return 0;
}
@@ -1474,6 +1472,7 @@
unsigned int bufsize, period_bytes, format_val;
int err;
+ azx_stream_reset(chip, azx_dev);
format_val = snd_hda_calc_stream_format(runtime->rate,
runtime->channels,
runtime->format,
@@ -1502,6 +1501,8 @@
return err;
}
+ azx_dev->min_jiffies = (runtime->period_size * HZ) /
+ (runtime->rate * 2);
azx_setup_controller(chip, azx_dev);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
azx_dev->fifo_size = azx_sd_readw(azx_dev, SD_FIFOSIZE) + 1;
@@ -1518,13 +1519,14 @@
struct azx *chip = apcm->chip;
struct azx_dev *azx_dev;
struct snd_pcm_substream *s;
- int start, nsync = 0, sbits = 0;
+ int rstart = 0, start, nsync = 0, sbits = 0;
int nwait, timeout;
switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ rstart = 1;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_START:
start = 1;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
@@ -1554,6 +1556,10 @@
if (s->pcm->card != substream->pcm->card)
continue;
azx_dev = get_azx_dev(s);
+ if (rstart) {
+ azx_dev->start_flag = 1;
+ azx_dev->start_jiffies = jiffies + azx_dev->min_jiffies;
+ }
if (start)
azx_stream_start(chip, azx_dev);
else
@@ -1703,6 +1709,11 @@
{
unsigned int pos;
+ if (azx_dev->start_flag &&
+ time_before_eq(jiffies, azx_dev->start_jiffies))
+ return -1; /* bogus (too early) interrupt */
+ azx_dev->start_flag = 0;
+
pos = azx_get_position(chip, azx_dev);
if (chip->position_fix == POS_FIX_AUTO) {
if (!pos) {