Re: Re: [Alsa-user] Upgrade problems -addendum

[Takashi Iwai <tiwai@suse.de>]

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At Fri, 24 Jan 2003 15:12:13 +0100,
Tais M. Hansen <tais.hansen@osd.dk> wrote:
> 
> On Friday 24 January 2003 14:30, Takashi Iwai wrote:
> > > Same deal as before, another 3 files filled with debug output. Good luck.
> > > :)
> > it seems that we need to use CURRPTR always on your chip.
> > i guess this depends on the board, how reliable IDX register is.
> 
> Need any specific info about the board? Chip? I saw some talks about the 
> ALC650 chip in another thread on this list and alsamixer claims I've got such 
> a chip.
 
most likely it has nothing to do with ALC650.
but lspci -v and lspci -n (for the chip) might be helpful for the
later development.

> 
> > if the attached new patch works, i'll add a module option to enable
> > this behavior.
> > good luck for you, too :)
> 
> Thanks. Maybe we should exchange good luck more often. Seems like you worked 
> some magic here. :)

now comes the patch of the week:

now you'll have possibility to change the behavior of the driver via a
module option idx_detect.

idx_detect=0 : the default, won't work for you.
idx_detect=1 : like test7.  perhaps not perfect.
idx_detect=2 : use the interrupt pointer only.  the resolution will be
               in the size of periods.  this should work.
idx_detect=3 : like test7 but don't evaluate the counter.
               might be be finer than idx_detect=2 but might be
               inaccurate in some cases.

if the debug output is only 'elapsed only', it's ok.


have fun :)


Takashi

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Index: alsa-kernel/pci/via82xx.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/pci/via82xx.c,v
retrieving revision 1.21
diff -u -r1.21 via82xx.c
--- alsa-kernel/pci/via82xx.c	22 Jan 2003 14:21:05 -0000	1.21
+++ alsa-kernel/pci/via82xx.c	24 Jan 2003 15:36:52 -0000
@@ -75,6 +75,7 @@
 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
 static long mpu_port[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -1};
 static int ac97_clock[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 48000};
+static int idx_detect[SNDRV_CARDS];
 
 MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
@@ -88,9 +89,12 @@
 MODULE_PARM(mpu_port, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
 MODULE_PARM_DESC(mpu_port, "MPU-401 port.");
 MODULE_PARM_SYNTAX(mpu_port, SNDRV_PORT_DESC);
-MODULE_PARM(ac97_clock, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
+MODULE_PARM(ac97_clock, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
 MODULE_PARM_SYNTAX(ac97_clock, SNDRV_ENABLED ",default:48000");
+MODULE_PARM(idx_detect, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
+MODULE_PARM_DESC(idx_detect, "Index update method for VIA823x chips (0 = default).");
+MODULE_PARM_SYNTAX(idx_detect, SNDRV_ENABLED);
 
 
 /* pci ids */
@@ -203,6 +207,14 @@
 #define VIA_TBL_BIT_FLAG	0x40000000
 #define VIA_TBL_BIT_EOL		0x80000000
 
+/* idx_detection */
+enum {
+	VIA_IDX_USE_IDX_REG,
+	VIA_IDX_USE_CURRPTR,
+	VIA_IDX_USE_PERIODS,
+	VIA_IDX_USE_CPTR_IDX
+};
+
 /*
  */
 
@@ -230,7 +242,10 @@
 	u32 *table; /* physical address + flag */
 	dma_addr_t table_addr;
 	struct snd_via_sg_table *idx_table;
+	int *period_idx;
+	unsigned int periods;
 	/* for recovery from the unexpected pointer */
+	unsigned int intr_cnt;
 	unsigned int lastpos;
 	unsigned int bufsize;
 	unsigned int bufsize2;
@@ -262,11 +277,17 @@
 		if (! dev->idx_table)
 			return -ENOMEM;
 	}
+	if (! dev->period_idx) {
+		dev->period_idx = kmalloc(sizeof(int) * VIA_TABLE_SIZE, GFP_KERNEL);
+		if (! dev->period_idx)
+			return -ENOMEM;
+	}
 
 	/* fill the entries */
 	idx = 0;
 	ofs = 0;
 	for (i = 0; i < periods; i++) {
+		dev->period_idx[i] = idx;
 		rest = fragsize;
 		/* fill descriptors for a period.
 		 * a period can be split to several descriptors if it's
@@ -303,6 +324,7 @@
 	dev->tbl_entries = idx;
 	dev->bufsize = periods * fragsize;
 	dev->bufsize2 = dev->bufsize / 2;
+	dev->periods = periods;
 	return 0;
 }
 
@@ -318,13 +340,18 @@
 		kfree(dev->idx_table);
 		dev->idx_table = NULL;
 	}
+	if (dev->period_idx) {
+		kfree(dev->period_idx);
+		dev->period_idx = NULL;
+	}
 }
 
 
 /*
  */
 
-enum { TYPE_VIA686 = 1, TYPE_VIA8233 };
+enum { TYPE_CARD_VIA686 = 1, TYPE_CARD_VIA8233 };
+enum { TYPE_VIA686, TYPE_VIA8233, TYPE_VIA8233A };
 
 #define VIA_MAX_DEVS	7	/* 4 playback, 1 multi, 2 capture */
 
@@ -344,6 +371,7 @@
 
 	unsigned char old_legacy;
 	unsigned char old_legacy_cfg;
+	int idx_detection;
 
 	struct pci_dev *pci;
 	snd_card_t *card;
@@ -365,8 +393,8 @@
 };
 
 static struct pci_device_id snd_via82xx_ids[] __devinitdata = {
-	{ 0x1106, 0x3058, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_VIA686, },	/* 686A */
-	{ 0x1106, 0x3059, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_VIA8233, },	/* VT8233 */
+	{ 0x1106, 0x3058, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA686, },	/* 686A */
+	{ 0x1106, 0x3059, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA8233, },	/* VT8233 */
 	{ 0, }
 };
 
@@ -481,10 +509,12 @@
 	/* disable interrupts */
 	outb(0x00, port + VIA_REG_OFFSET_CONTROL);
 	/* clear interrupts */
-	outb(0x03, port + VIA_REG_OFFSET_STATUS);
-	outb(0x00, port + VIA_REG_OFFSET_TYPE); /* for via686 */
+	outb(0x07, port + VIA_REG_OFFSET_STATUS);
+	if (chip->chip_type == TYPE_VIA686)
+		outb(0x00, port + VIA_REG_OFFSET_TYPE);
 	outl(0, port + VIA_REG_OFFSET_CURR_PTR);
 	viadev->lastpos = 0;
+	viadev->intr_cnt = 0;
 }
 
 
@@ -512,10 +542,20 @@
 	/* check status for each stream */
 	for (i = 0; i < chip->num_devs; i++) {
 		viadev_t *viadev = &chip->devs[i];
-		if (inb(chip->port + viadev->reg_offset) & (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG)) {
-			outb(VIA_REG_STAT_FLAG | VIA_REG_STAT_EOL, VIAREG(chip, OFFSET_STATUS) + viadev->reg_offset);
+		unsigned long port = chip->port + viadev->reg_offset; /* STATUS */
+		unsigned char status = inb(port) & 0x07;
+		if (! status)
+			continue;
+		outb(status, port); /* ack */
+		if (status & (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG)) {
 			if (viadev->substream && viadev->running) {
+				viadev->intr_cnt++;
+				if (viadev->intr_cnt >= viadev->periods)
+					viadev->intr_cnt = 0;
 				spin_unlock(&chip->reg_lock);
+#ifdef POINTER_DEBUG
+				snd_printd("period elapsed\n");
+#endif
 				snd_pcm_period_elapsed(viadev->substream);
 				spin_lock(&chip->reg_lock);
 			}
@@ -538,7 +578,7 @@
 	unsigned char val;
 	unsigned long port = chip->port + viadev->reg_offset;
 
-	if (chip->chip_type == TYPE_VIA8233)
+	if (chip->chip_type != TYPE_VIA686)
 		val = VIA_REG_CTRL_INT;
 	else
 		val = 0;
@@ -585,17 +625,17 @@
 	/* check the validity of the calculated position */
 	if (size < count || (res < viadev->lastpos && (res >= viadev->bufsize2 || viadev->lastpos < viadev->bufsize2))) {
 #ifdef POINTER_DEBUG
-		printk("fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n", idx, viadev->tbl_entries, viadev->lastpos, viadev->bufsize2, viadev->idx_table[idx].offset, viadev->idx_table[idx].size, count);
+		snd_printd("fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n", idx, viadev->tbl_entries, viadev->lastpos, viadev->bufsize2, viadev->idx_table[idx].offset, viadev->idx_table[idx].size, count);
 #endif
 		/* count register returns full size when end of buffer is reached */
 		if (size != count) {
-			snd_printd(KERN_ERR "invalid via82xx_cur_ptr, using last valid pointer\n");
-			res = viadev->lastpos;
+			snd_printd("invalid via82xx_cur_ptr, using last valid pointer\n");
+			return viadev->lastpos;
 		} else {
 			res = viadev->idx_table[idx].offset + size;
 			if (res < viadev->lastpos && (res >= viadev->bufsize2 || viadev->lastpos < viadev->bufsize2)) {
-				snd_printd(KERN_ERR "invalid via82xx_cur_ptr (2), using last valid pointer\n");
-				res = viadev->lastpos;
+				snd_printd("invalid via82xx_cur_ptr (2), using last valid pointer\n");
+				return viadev->lastpos;
 			}
 		}
 	}
@@ -646,11 +686,35 @@
 	snd_assert(viadev->tbl_entries, return 0);
 	if (!(inb(VIAREG(chip, OFFSET_STATUS) + viadev->reg_offset) & VIA_REG_STAT_ACTIVE))
 		return 0;
+
+	if (chip->idx_detection == VIA_IDX_USE_PERIODS) {
+		idx = viadev->period_idx[viadev->intr_cnt];
+		res = viadev->idx_table[idx].offset;
+		return bytes_to_frames(substream->runtime, res);
+	}
+
 	spin_lock(&chip->reg_lock);
 	count = inl(VIAREG(chip, OFFSET_CURR_COUNT) + viadev->reg_offset);
-	idx = count >> 24;
-	count &= 0xffffff;
-	res = calc_linear_pos(viadev, idx, count);
+	switch (chip->idx_detection) {
+	case VIA_IDX_USE_CURRPTR:
+	case VIA_IDX_USE_CPTR_IDX:
+		/* detect the index from CURRPTR register */
+		idx = inl(VIAREG(chip, OFFSET_CURR_PTR) + viadev->reg_offset);
+		if (idx <= (unsigned int)viadev->table_addr)
+			idx = 0;
+		else
+			idx = (idx - (unsigned int)viadev->table_addr - 4) / 8;
+		break;
+	default:
+		idx = (count >> 24) & viadev->tbl_entries;
+		break;
+	}
+	if (chip->idx_detection != VIA_IDX_USE_CPTR_IDX) {
+		count &= 0xffffff;
+		res = calc_linear_pos(viadev, idx, count);
+	} else {
+		res = viadev->idx_table[idx].offset;
+	}
 	spin_unlock(&chip->reg_lock);
 
 	return bytes_to_frames(substream->runtime, res);
@@ -950,7 +1014,7 @@
 	if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
 		return err;
 	substream->runtime->hw.channels_max = 6;
-	if (chip->revision == VIA_REV_8233A)
+	if (chip->chip_type == TYPE_VIA8233A)
 		snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels);
 	return 0;
 }
@@ -1365,7 +1429,7 @@
 	int i, err, caps;
 	unsigned char val;
 
-	caps = chip->revision == VIA_REV_8233A ? 1 : 2;
+	caps = chip->chip_type == TYPE_VIA8233A ? 1 : 2;
 	for (i = 0; i < caps; i++) {
 		snd_via8233_capture_source.index = i;
 		err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_capture_source, chip));
@@ -1651,6 +1715,19 @@
 	return 0;
 }
 
+struct via823x_info {
+	int revision;
+	char *name;
+	int type;
+};
+static struct via823x_info via823x_cards[] = {
+	{ VIA_REV_PRE_8233, "VIA 8233-Pre", TYPE_VIA8233 },
+	{ VIA_REV_8233C, "VIA 8233C", TYPE_VIA8233 },
+	{ VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
+	{ VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
+	{ VIA_REV_8233, "VIA 8235", TYPE_VIA8233 },
+};
+
 static int __devinit snd_via82xx_probe(struct pci_dev *pci,
 				       const struct pci_device_id *pci_id)
 {
@@ -1658,7 +1735,7 @@
 	snd_card_t *card;
 	via82xx_t *chip;
 	unsigned char revision;
-	int chip_type;
+	int chip_type = 0, card_type;
 	int i, err;
 
 	if (dev >= SNDRV_CARDS)
@@ -1672,24 +1749,30 @@
 	if (card == NULL)
 		return -ENOMEM;
 
-	chip_type = pci_id->driver_data;
+	card_type = pci_id->driver_data;
 	pci_read_config_byte(pci, PCI_REVISION_ID, &revision);
-	switch (chip_type) {
-	case TYPE_VIA686:
+	switch (card_type) {
+	case TYPE_CARD_VIA686:
 		strcpy(card->driver, "VIA686A");
 		strcpy(card->shortname, "VIA 82C686A/B");
+		chip_type = TYPE_VIA686;
 		break;
-	case TYPE_VIA8233:
-		if (revision == VIA_REV_8233A) {
+	case TYPE_CARD_VIA8233:
+		chip_type = TYPE_VIA8233;
+		sprintf(card->shortname, "VIA 823x rev%d", revision);
+		for (i = 0; i < ARRAY_SIZE(via823x_cards); i++) {
+			if (revision == via823x_cards[i].revision) {
+				chip_type = via823x_cards[i].type;
+				strcpy(card->shortname, via823x_cards[i].name);
+			}
+		}
+		if (chip_type == VIA_REV_8233A)
 			strcpy(card->driver, "VIA8233A");
-			strcpy(card->shortname, "VIA 8233A");
-		} else {
+		else
 			strcpy(card->driver, "VIA8233");
-			strcpy(card->shortname, "VIA 8233/C");
-		}
 		break;
 	default:
-		snd_printk(KERN_ERR "invalid chip type %d\n", chip_type);
+		snd_printk(KERN_ERR "invalid card type %d\n", card_type);
 		err = -EINVAL;
 		goto __error;
 	}
@@ -1697,6 +1780,8 @@
 	if ((err = snd_via82xx_create(card, pci, chip_type, ac97_clock[dev], &chip)) < 0)
 		goto __error;
 
+	chip->idx_detection = idx_detect[dev];
+
 	if ((err = snd_via82xx_mixer_new(chip)) < 0)
 		goto __error;
 
@@ -1705,7 +1790,7 @@
 		    (err = snd_via686_init_misc(chip, dev)) < 0)
 			goto __error;
 	} else {
-		if (revision == VIA_REV_8233A) {
+		if (chip_type == VIA_REV_8233A) {
 			if ((err = snd_via8233a_pcm_new(chip)) < 0)
 				goto __error;
 		} else {
@@ -1792,4 +1877,3 @@
 __setup("snd-via82xx=", alsa_card_via82xx_setup);
 
 #endif /* ifndef MODULE */
-