Commit c673ba1c authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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



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: default avatarTakashi Iwai <tiwai@suse.de>
parent 09240cf4

sound/pci/hda/hda_intel.c

+18 −13
Original line number Diff line number Diff line
@@ -2059,16 +2059,22 @@ 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
@@ -2077,8 +2083,7 @@ static int __devinit check_position_fix(struct azx *chip, int fix) 
		       q->value, q->subvendor, q->subdevice);

		return q->value;

	}

	}

	return fix;

	return POS_FIX_AUTO;

}



/*