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ALSA: hda - Workaround for buggy DMA position on ATI controllers

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The position-buffer on ATI controllers are unreliable as well as
on VIA chips, thus the same workaround for DMA position reading as
VIA is useful for ATI.

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-03-17 07:49:14 +01:00
parent 09240cf429
commit c673ba1c23
1 changed files with 18 additions and 13 deletions
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31
sound/pci/hda/hda_intel.c
View file

@ -2059,26 +2059,31 @@ static int __devinit check_position_fix(struct azx *chip, int fix)
{
const struct snd_pci_quirk *q;
/* Check VIA HD Audio Controller exist */
if (chip->pci->vendor == PCI_VENDOR_ID_VIA &&
chip->pci->device == VIA_HDAC_DEVICE_ID) {
switch (fix) {
case POS_FIX_LPIB:
case POS_FIX_POSBUF:
return fix;
}
/* Check VIA/ATI HD Audio Controller exist */
switch (chip->driver_type) {
case AZX_DRIVER_VIA:
case AZX_DRIVER_ATI:
chip->via_dmapos_patch = 1;
/* Use link position directly, avoid any transfer problem. */
return POS_FIX_LPIB;
}
chip->via_dmapos_patch = 0;
if (fix == POS_FIX_AUTO) {
q = snd_pci_quirk_lookup(chip->pci, position_fix_list);
if (q) {
printk(KERN_INFO
"hda_intel: position_fix set to %d "
"for device %04x:%04x\n",
q->value, q->subvendor, q->subdevice);
return q->value;
}
q = snd_pci_quirk_lookup(chip->pci, position_fix_list);
if (q) {
printk(KERN_INFO
"hda_intel: position_fix set to %d "
"for device %04x:%04x\n",
q->value, q->subvendor, q->subdevice);
return q->value;
}
return fix;
return POS_FIX_AUTO;
}
/*