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Subject[alsa-devel][PATCH] hda_intel: enable snoop for nvidia HDA controller
Enable the snoop for nvidia hda controller to avoid data coherence issue.

Signed-off-by: Peer Chen <peerchen@gmail.com>
---
--- linux-2.6.27-rc1/sound/pci/hda/hda_intel.c.orig 2008-08-01 14:14:54.000000000 -0400
+++ linux-2.6.27-rc1/sound/pci/hda/hda_intel.c 2008-08-01 14:31:38.000000000 -0400
@@ -277,6 +277,9 @@ enum {
/* Defines for Nvidia HDA support */
#define NVIDIA_HDA_TRANSREG_ADDR 0x4e
#define NVIDIA_HDA_ENABLE_COHBITS 0x0f
+#define NVIDIA_HDA_ISTRM_COH 0x4d
+#define NVIDIA_HDA_OSTRM_COH 0x4c
+#define NVIDIA_HDA_ENABLE_COHBIT 0x01

/* Defines for Intel SCH HDA snoop control */
#define INTEL_SCH_HDA_DEVC 0x78
@@ -899,6 +902,12 @@ static void azx_init_pci(struct azx *chi
update_pci_byte(chip->pci,
NVIDIA_HDA_TRANSREG_ADDR,
0x0f, NVIDIA_HDA_ENABLE_COHBITS);
+ update_pci_byte(chip->pci,
+ NVIDIA_HDA_ISTRM_COH,
+ 0x01, NVIDIA_HDA_ENABLE_COHBIT);
+ update_pci_byte(chip->pci,
+ NVIDIA_HDA_OSTRM_COH,
+ 0x01, NVIDIA_HDA_ENABLE_COHBIT);
break;
case AZX_DRIVER_SCH:
pci_read_config_word(chip->pci, INTEL_SCH_HDA_DEVC, &snoop);
-


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