Merge branch 'master' of git://git.alsa-project.org/alsa-kernel into …

…for-linus

* 'master' of git://git.alsa-project.org/alsa-kernel:
  [ALSA] intel8x0: add one retry to the ac97_clock measurement routine
  [ALSA] intel8x0: fix wrong conditions in ac97_clock measure routine
  [ALSA] intel8x0: do not use zero value from PICB register
  [ALSA] intel8x0: an attempt to make ac97_clock measurement more reliable
  [ALSA] pcm-midlevel: Add more strict buffer position checks based on jiffies
  [ALSA] hda_intel: fix unexpected ring buffer positions

include/sound/pcm.h

@@ -268,7 +268,8 @@ struct snd_pcm_runtime {
 	int overrange;
 	snd_pcm_uframes_t avail_max;
 	snd_pcm_uframes_t hw_ptr_base;	/* Position at buffer restart */
-	snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
+	snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
+	unsigned long hw_ptr_jiffies;	/* Time when hw_ptr is updated */
 
 	/* -- HW params -- */
 	snd_pcm_access_t access;	/* access mode */

sound/core/pcm_lib.c

@@ -209,9 +209,11 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t pos;
-	snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt, hw_base;
-	snd_pcm_sframes_t delta;
+	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
+	snd_pcm_sframes_t hdelta, delta;
+	unsigned long jdelta;
 
+	old_hw_ptr = runtime->status->hw_ptr;
 	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 	if (pos == SNDRV_PCM_POS_XRUN) {
 		xrun(substream);
@@ -247,7 +249,30 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 			new_hw_ptr = hw_base + pos;
 		}
 	}
-	if (delta > runtime->period_size) {
+	hdelta = new_hw_ptr - old_hw_ptr;
+	jdelta = jiffies - runtime->hw_ptr_jiffies;
+	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
+		delta = jdelta /
+			(((runtime->period_size * HZ) / runtime->rate)
+								+ HZ/100);
+		hw_ptr_error(substream,
+			     "hw_ptr skipping! [Q] "
+			     "(pos=%ld, delta=%ld, period=%ld, "
+			     "jdelta=%lu/%lu/%lu)\n",
+			     (long)pos, (long)hdelta,
+			     (long)runtime->period_size, jdelta,
+			     ((hdelta * HZ) / runtime->rate), delta);
+		hw_ptr_interrupt = runtime->hw_ptr_interrupt +
+				   runtime->period_size * delta;
+		if (hw_ptr_interrupt >= runtime->boundary)
+			hw_ptr_interrupt -= runtime->boundary;
+		/* rebase to interrupt position */
+		hw_base = new_hw_ptr = hw_ptr_interrupt;
+		/* align hw_base to buffer_size */
+		hw_base -= hw_base % runtime->buffer_size;
+		delta = 0;
+	}
+	if (delta > runtime->period_size + runtime->period_size / 2) {
 		hw_ptr_error(substream,
 			     "Lost interrupts? "
 			     "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
@@ -263,6 +288,7 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 
 	runtime->hw_ptr_base = hw_base;
 	runtime->status->hw_ptr = new_hw_ptr;
+	runtime->hw_ptr_jiffies = jiffies;
 	runtime->hw_ptr_interrupt = hw_ptr_interrupt;
 
 	return snd_pcm_update_hw_ptr_post(substream, runtime);
@@ -275,6 +301,7 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 	snd_pcm_uframes_t pos;
 	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 	snd_pcm_sframes_t delta;
+	unsigned long jdelta;
 
 	old_hw_ptr = runtime->status->hw_ptr;
 	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
@@ -286,27 +313,29 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 	new_hw_ptr = hw_base + pos;
 
 	delta = new_hw_ptr - old_hw_ptr;
+	jdelta = jiffies - runtime->hw_ptr_jiffies;
 	if (delta < 0) {
 		delta += runtime->buffer_size;
 		if (delta < 0) {
 			hw_ptr_error(substream, 
 				     "Unexpected hw_pointer value [2] "
-				     "(stream=%i, pos=%ld, old_ptr=%ld)\n",
+				     "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
 				     substream->stream, (long)pos,
-				     (long)old_hw_ptr);
+				     (long)old_hw_ptr, jdelta);
 			return 0;
 		}
 		hw_base += runtime->buffer_size;
 		if (hw_base >= runtime->boundary)
 			hw_base = 0;
 		new_hw_ptr = hw_base + pos;
 	}
-	if (delta > runtime->period_size && runtime->periods > 1) {
+	if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
 		hw_ptr_error(substream,
 			     "hw_ptr skipping! "
-			     "(pos=%ld, delta=%ld, period=%ld)\n",
+			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
 			     (long)pos, (long)delta,
-			     (long)runtime->period_size);
+			     (long)runtime->period_size, jdelta,
+			     ((delta * HZ) / runtime->rate));
 		return 0;
 	}
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
@@ -315,6 +344,7 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 
 	runtime->hw_ptr_base = hw_base;
 	runtime->status->hw_ptr = new_hw_ptr;
+	runtime->hw_ptr_jiffies = jiffies;
 
 	return snd_pcm_update_hw_ptr_post(substream, runtime);
 }
@@ -1441,6 +1471,7 @@ static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
 		runtime->status->hw_ptr %= runtime->buffer_size;
 	else
 		runtime->status->hw_ptr = 0;
+	runtime->hw_ptr_jiffies = jiffies;
 	snd_pcm_stream_unlock_irqrestore(substream, flags);
 	return 0;
 }

sound/pci/hda/hda_intel.c

@@ -312,6 +312,9 @@ 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 */
 
@@ -330,7 +333,6 @@ 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
@@ -975,7 +977,7 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
 	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 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
 			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 @@ static int azx_setup_periods(struct azx *chip,
 	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 @@ static int azx_setup_periods(struct azx *chip,
 					 &bdl, ofs, pos_adj, 1);
 			if (ofs < 0)
 				goto error;
-			azx_dev->irq_ignore = 1;
 		}
 	} else
 		pos_adj = 0;
@@ -1155,6 +1151,9 @@ static void azx_stream_reset(struct azx *chip, struct azx_dev *azx_dev)
 	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 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
 	snd_pcm_set_sync(substream);
 	mutex_unlock(&chip->open_mutex);
 
-	azx_stream_reset(chip, azx_dev);
 	return 0;
 }
 
@@ -1474,6 +1472,7 @@ static int azx_pcm_prepare(struct snd_pcm_substream *substream)
 	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 @@ static int azx_pcm_prepare(struct snd_pcm_substream *substream)
 			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 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 	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 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 		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 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
 {
 	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) {