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authorTakashi Iwai <tiwai@suse.de>2009-03-17 07:47:18 +0100
committerTakashi Iwai <tiwai@suse.de>2009-03-18 07:45:41 +0100
commit09240cf429505891d6123ce14a29f58f2a60121e (patch)
tree5b5b460e0241b3fa3b02e596b47d9faf582f6372
parentc50ff7c04225c945b13d410d50fde6ff6c59d7ee (diff)
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: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/hda/hda_intel.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 5e909e0da04..643f0e49929 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -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