ALSA: hda - Handle -1 as invalid position, too

When reading from the position-buffer results in -1, handle as it's
invalid and falls back to LPIB mode as well as 0.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_intel.c

@@ -1930,6 +1930,17 @@ static unsigned int azx_get_position(struct azx *chip,
 	default:
 		/* use the position buffer */
 		pos = le32_to_cpu(*azx_dev->posbuf);
+		if (chip->position_fix[stream] == POS_FIX_AUTO) {
+			if (!pos || pos == (u32)-1) {
+				printk(KERN_WARNING
+				       "hda-intel: Invalid position buffer, "
+				       "using LPIB read method instead.\n");
+				chip->position_fix[stream] = POS_FIX_LPIB;
+				pos = azx_sd_readl(azx_dev, SD_LPIB);
+			} else
+				chip->position_fix[stream] = POS_FIX_POSBUF;
+		}
+		break;
 	}
 
 	if (pos >= azx_dev->bufsize)
@@ -1967,16 +1978,6 @@ static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
 
 	stream = azx_dev->substream->stream;
 	pos = azx_get_position(chip, azx_dev);
-	if (chip->position_fix[stream] == POS_FIX_AUTO) {
-		if (!pos) {
-			printk(KERN_WARNING
-			       "hda-intel: Invalid position buffer, "
-			       "using LPIB read method instead.\n");
-			chip->position_fix[stream] = POS_FIX_LPIB;
-			pos = azx_get_position(chip, azx_dev);
-		} else
-			chip->position_fix[stream] = POS_FIX_POSBUF;
-	}
 
 	if (WARN_ONCE(!azx_dev->period_bytes,
 		      "hda-intel: zero azx_dev->period_bytes"))