From: Jaroslav Kysela Subject: [ALSA] hda_intel: fix unexpected ring buffer positions Patch-mainline: 2.6.30-rc3 References: bnc#502733 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 Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_intel.c | 39 +++++++++++++++++++++++++-------------- 1 file changed, 25 insertions(+), 14 deletions(-) --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -304,6 +304,9 @@ struct azx_dev { 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 */ @@ -322,7 +325,6 @@ struct azx_dev { 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 @@ -964,7 +966,7 @@ static irqreturn_t azx_interrupt(int irq struct azx *chip = dev_id; struct azx_dev *azx_dev; u32 status; - int i; + int i, ok; spin_lock(&chip->reg_lock); @@ -980,18 +982,14 @@ static irqreturn_t azx_interrupt(int irq 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, @@ -1080,7 +1078,6 @@ static int azx_setup_periods(struct azx 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; @@ -1101,7 +1098,6 @@ static int azx_setup_periods(struct azx &bdl, ofs, pos_adj, 1); if (ofs < 0) goto error; - azx_dev->irq_ignore = 1; } } else pos_adj = 0; @@ -1147,6 +1143,9 @@ static void azx_stream_reset(struct azx 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; } /* @@ -1396,7 +1395,6 @@ static int azx_pcm_open(struct snd_pcm_s snd_pcm_set_sync(substream); mutex_unlock(&chip->open_mutex); - azx_stream_reset(chip, azx_dev); return 0; } @@ -1461,6 +1459,7 @@ static int azx_pcm_prepare(struct snd_pc 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, @@ -1489,6 +1488,8 @@ static int azx_pcm_prepare(struct snd_pc 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; @@ -1505,13 +1506,14 @@ static int azx_pcm_trigger(struct snd_pc 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: @@ -1541,6 +1543,10 @@ static int azx_pcm_trigger(struct snd_pc 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 @@ -1690,6 +1696,11 @@ static int azx_position_ok(struct azx *c { 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) {