ALSA: hda - remove position_fix=3

position_fix=3 is the option to correct the DMA position with the
FIFO size.  But, it never worked correctly, and we have now more other
workarounds for the DMA position fixes.  Thus better to remove it.

Also, change POS_FIX_NONE to POS_FIX_LPIB to represent its real role
better.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -753,7 +753,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     [Multiple options for each card instance]
     model	- force the model name
-    position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
+    position_fix - Fix DMA pointer (0 = auto, 1 = use LPIB, 2 = POSBUF)
     probe_mask  - Bitmask to probe codecs (default = -1, meaning all slots)
 
     [Single (global) options]

sound/pci/hda/hda_intel.c

@@ -70,7 +70,7 @@ module_param_array(model, charp, NULL, 0444);
 MODULE_PARM_DESC(model, "Use the given board model.");
 module_param_array(position_fix, int, NULL, 0444);
 MODULE_PARM_DESC(position_fix, "Fix DMA pointer "
-		 "(0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size).");
+		 "(0 = auto, 1 = none, 2 = POSBUF).");
 module_param_array(probe_mask, int, NULL, 0444);
 MODULE_PARM_DESC(probe_mask, "Bitmask to probe codecs (default = -1).");
 module_param(single_cmd, bool, 0444);
@@ -266,9 +266,8 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 /* position fix mode */
 enum {
 	POS_FIX_AUTO,
-	POS_FIX_NONE,
+	POS_FIX_LPIB,
 	POS_FIX_POSBUF,
-	POS_FIX_FIFO,
 };
 
 /* Defines for ATI HD Audio support in SB450 south bridge */
@@ -1506,8 +1505,6 @@ static unsigned int azx_get_position(struct azx *chip,
 	} else {
 		/* read LPIB */
 		pos = azx_sd_readl(azx_dev, SD_LPIB);
-		if (chip->position_fix == POS_FIX_FIFO)
-			pos += azx_dev->fifo_size;
 	}
 	if (pos >= azx_dev->bufsize)
 		pos = 0;
@@ -1542,7 +1539,7 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
 			printk(KERN_WARNING
 			       "hda-intel: Invalid position buffer, "
 			       "using LPIB read method instead.\n");
-			chip->position_fix = POS_FIX_NONE;
+			chip->position_fix = POS_FIX_LPIB;
 			pos = azx_get_position(chip, azx_dev);
 		} else
 			chip->position_fix = POS_FIX_POSBUF;
@@ -1917,9 +1914,9 @@ static int azx_dev_free(struct snd_device *device)
  * white/black-listing for position_fix
  */
 static struct snd_pci_quirk position_fix_list[] __devinitdata = {
-	SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_NONE),
-	SND_PCI_QUIRK(0x1028, 0x01de, "Dell Precision 390", POS_FIX_NONE),
-	SND_PCI_QUIRK(0x1043, 0x813d, "ASUS P5AD2", POS_FIX_NONE),
+	SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_LPIB),
+	SND_PCI_QUIRK(0x1028, 0x01de, "Dell Precision 390", POS_FIX_LPIB),
+	SND_PCI_QUIRK(0x1043, 0x813d, "ASUS P5AD2", POS_FIX_LPIB),
 	{}
 };