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authorTakashi Iwai <tiwai@suse.de>2011-05-17 18:41:25 +0200
committerTakashi Iwai <tiwai@suse.de>2011-05-17 18:41:25 +0200
commit20c304ed84e05a91b2acae36d428d621d3c1d1c6 (patch)
tree8060cd5fdd14ac8ce5d38e62cf231f6679a3c0de /sound
parentb55fcb508dfc9f00056beb33d4c466bc9032dd05 (diff)
ALSA: hda - Enable snoop bit for AMD controllers
AMD Hudson controllers give noisy outputs when the buffer data is rewritten on the fly as PulseAudio does. This seems fixed by the snoop bit enabled just like ATI chipset. Also, disable 64bit DMA as now, to be sure. We can revisit this later. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/hda_intel.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 010fd318196..ecadb5b7d64 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1092,7 +1092,13 @@ static void azx_init_pci(struct azx *chip)
? "Failed" : "OK");
}
break;
-
+ default:
+ /* AMD Hudson needs the similar snoop, as it seems... */
+ if (chip->pci->vendor == PCI_VENDOR_ID_AMD)
+ update_pci_byte(chip->pci,
+ ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR,
+ 0x07, ATI_SB450_HDAUDIO_ENABLE_SNOOP);
+ break;
}
}
@@ -2566,6 +2572,13 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
gcap &= ~ICH6_GCAP_64OK;
pci_dev_put(p_smbus);
}
+ } else {
+ /* FIXME: not sure whether this is really needed, but
+ * Hudson isn't stable enough for allowing everything...
+ * let's check later again.
+ */
+ if (chip->pci->vendor == PCI_VENDOR_ID_AMD)
+ gcap &= ~ICH6_GCAP_64OK;
}
/* disable 64bit DMA address for Teradici */