HDA driver disabled HD audio 64bit address support for all AMD SB600/SB700/SB800
platforms with commit 09240cf429505891d6123ce14a29f58f2a60121e due to one SB600
issue reported by community, but we do not see the similar issue on SB700/SB800
platforms. This patch is to refine the workaround for SB600 only.
Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx>
diff -ruN a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
--- a/sound/pci/hda/hda_intel.c 2009-07-01 17:14:23.000000000 +0800
+++ b/sound/pci/hda/hda_intel.c 2009-07-08 10:24:35.000000000 +0800
@@ -2322,9 +2322,19 @@
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)))
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