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ALSA: hda - Fix DMA mask for ATI controllers

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ATI controllers (at least some SB0600 models) appear buggy to handle
64bit DMA.  As a workaround, reset GCAP bit0 and let the driver to
use only 32bit DMA on these controllers.

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-03-17 07:47:18 +01:00
parent c50ff7c042
commit 09240cf429
1 changed files with 8 additions and 0 deletions
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8
sound/pci/hda/hda_intel.c
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@ -2210,9 +2210,17 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
gcap = azx_readw(chip, GCAP);
snd_printdd("chipset global capabilities = 0x%x\n", gcap);
/* ATI chips seems buggy about 64bit DMA addresses */
if (chip->driver_type == AZX_DRIVER_ATI)
gcap &= ~0x01;
/* allow 64bit DMA address if supported by H/W */
if ((gcap & 0x01) && !pci_set_dma_mask(pci, DMA_64BIT_MASK))
pci_set_consistent_dma_mask(pci, DMA_64BIT_MASK);
else {
pci_set_dma_mask(pci, DMA_32BIT_MASK);
pci_set_consistent_dma_mask(pci, DMA_32BIT_MASK);
}
/* read number of streams from GCAP register instead of using
* hardcoded value