[095/146] ALSA: hda - Use LPIB for ATI/AMD chipsets as default

[Greg KH]

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Takashi Iwai <tiwai@xxxxxxx>

commit 50e3bbf9898840eead86f90a43b3625a2b2f4112 upstream.

ATI and AMD chipsets seem not providing the proper position-buffer
information, and it also doesn't provide FIFO register required by
VIACOMBO fix.  It's better to use LPIB for these.

Reported-by: David Henningsson <david.henningsson@xxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 sound/pci/hda/hda_intel.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2346,9 +2346,16 @@ static int __devinit check_position_fix(
 	/* Check VIA/ATI HD Audio Controller exist */
 	switch (chip->driver_type) {
 	case AZX_DRIVER_VIA:
-	case AZX_DRIVER_ATI:
 		/* Use link position directly, avoid any transfer problem. */
 		return POS_FIX_VIACOMBO;
+	case AZX_DRIVER_ATI:
+		/* ATI chipsets don't work well with position-buffer */
+		return POS_FIX_LPIB;
+	case AZX_DRIVER_GENERIC:
+		/* AMD chipsets also don't work with position-buffer */
+		if (chip->pci->vendor == PCI_VENDOR_ID_AMD)
+			return POS_FIX_LPIB;
+		break;
 	}
 
 	return POS_FIX_AUTO;


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