ALSA: hda - Disable AMD SB600 64bit address support only

[safe/jmp/linux-2.6] / sound / pci / hda / hda_intel.c

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 16e09d7..77c1b84 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2333,9 +2333,19 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
        gcap = azx_readw(chip, GCAP);
        snd_printdd(SFX "chipset global capabilities = 0x%x\n", gcap);
 
-       /* ATI chips seems buggy about 64bit DMA addresses */
-       if (chip->driver_type == AZX_DRIVER_ATI)
-               gcap &= ~ICH6_GCAP_64OK;
+       /* disable SB600 64bit support for safety */
+       if ((chip->driver_type == AZX_DRIVER_ATI) ||
+           (chip->driver_type == AZX_DRIVER_ATIHDMI)) {
+               struct pci_dev *p_smbus;
+               p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
+                                        PCI_DEVICE_ID_ATI_SBX00_SMBUS,
+                                        NULL);
+               if (p_smbus) {
+                       if (p_smbus->revision < 0x30)
+                               gcap &= ~ICH6_GCAP_64OK;
+                       pci_dev_put(p_smbus);
+               }
+       }
 
        /* allow 64bit DMA address if supported by H/W */
        if ((gcap & ICH6_GCAP_64OK) && !pci_set_dma_mask(pci, DMA_BIT_MASK(64)))