Commit a6f2fd55 authored by Takashi Iwai's avatar Takashi Iwai

ALSA: hda - Add position_fix=4 (COMBO) option

This patch adds a new position_fix option value, 4, as a combo mode
to use LPIB for playbacks and POSBUF for captures.  It's the way
recommended by Intel hardware guys.
Signed-off-by: Takashi Iwai's avatarTakashi Iwai <>
parent 5556e147
......@@ -860,7 +860,8 @@ 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 = use LPIB, 2 = POSBUF)
position_fix - Fix DMA pointer (0 = auto, 1 = use LPIB, 2 = POSBUF,
probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
When the bit 8 (0x100) is set, the lower 8 bits are used
as the "fixed" codec slots; i.e. the driver probes the
......@@ -925,6 +926,11 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
(Usually SD_LPIB register is more accurate than the
position buffer.)
position_fix=3 is specific to VIA devices. The position
of the capture stream is checked from both LPIB and POSBUF
values. position_fix=4 is a combination mode, using LPIB
for playback and POSBUF for capture.
NB: If you get many "azx_get_response timeout" messages at
loading, it's likely a problem of interrupts (e.g. ACPI irq
routing). Try to boot with options like "pci=noacpi". Also, you
......@@ -59,7 +59,12 @@ a case, you can change the default method via `position_fix` option.
`position_fix=1` means to use LPIB method explicitly.
`position_fix=2` means to use the position-buffer.
`position_fix=3` means to use a combination of both methods, needed
for some VIA and ATI controllers. 0 is the default value for all other
for some VIA controllers. The capture stream position is corrected
by comparing both LPIB and position-buffer values.
`position_fix=4` is another combination available for all controllers,
and uses LPIB for the playback and the position-buffer for the capture
0 is the default value for all other
controllers, the automatic check and fallback to LPIB as described in
the above. If you get a problem of repeated sounds, this option might
......@@ -84,7 +84,7 @@ 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, "DMA pointer read method."
"(0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO).");
"(0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO).");
module_param_array(bdl_pos_adj, int, NULL, 0644);
MODULE_PARM_DESC(bdl_pos_adj, "BDL position adjustment offset.");
module_param_array(probe_mask, int, NULL, 0444);
......@@ -330,6 +330,7 @@ enum {
/* Defines for ATI HD Audio support in SB450 south bridge */
......@@ -2520,6 +2521,7 @@ static int __devinit check_position_fix(struct azx *chip, int fix)
return fix;
......@@ -2699,6 +2701,12 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
chip->position_fix[0] = chip->position_fix[1] =
check_position_fix(chip, position_fix[dev]);
/* combo mode uses LPIB for playback */
if (chip->position_fix[0] == POS_FIX_COMBO) {
chip->position_fix[0] = POS_FIX_LPIB;
chip->position_fix[1] = POS_FIX_AUTO;
check_probe_mask(chip, dev);
chip->single_cmd = single_cmd;
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