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Commit 09240cf4 authored by Takashi Iwai's avatar Takashi Iwai
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ALSA: hda - Fix DMA mask for ATI controllers 



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: default avatarTakashi Iwai <tiwai@suse.de>
parent c50ff7c0

sound/pci/hda/hda_intel.c

+8 −0
Original line number Diff line number Diff line
@@ -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