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>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 5e909e0..643f0e4 100644 (file)
--- 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