lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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