[ALSA] hda-intel - Support 64bit buffer allocation

The HD-audio hardware usually supports 64bit address for DMA and other
buffers.  The patch enables the feature if supported.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index b38a5a70ff08..ec3ddda30beb 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1843,6 +1843,10 @@ 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);
 
+        /* 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);
+
         if (gcap) {
                 /* read number of streams from GCAP register instead of using
                  * hardcoded value