ALSA: 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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -278,6 +278,9 @@ enum {
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/* Defines for Nvidia HDA support */
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#define NVIDIA_HDA_TRANSREG_ADDR 0x4e
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#define NVIDIA_HDA_ENABLE_COHBITS 0x0f
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#define NVIDIA_HDA_ISTRM_COH 0x4d
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#define NVIDIA_HDA_OSTRM_COH 0x4c
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#define NVIDIA_HDA_ENABLE_COHBIT 0x01
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/* Defines for Intel SCH HDA snoop control */
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#define INTEL_SCH_HDA_DEVC 0x78
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@ -900,6 +903,12 @@ static void azx_init_pci(struct azx *chip)
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update_pci_byte(chip->pci,
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NVIDIA_HDA_TRANSREG_ADDR,
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0x0f, NVIDIA_HDA_ENABLE_COHBITS);
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update_pci_byte(chip->pci,
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NVIDIA_HDA_ISTRM_COH,
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0x01, NVIDIA_HDA_ENABLE_COHBIT);
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update_pci_byte(chip->pci,
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NVIDIA_HDA_OSTRM_COH,
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0x01, NVIDIA_HDA_ENABLE_COHBIT);
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break;
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case AZX_DRIVER_SCH:
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pci_read_config_word(chip->pci, INTEL_SCH_HDA_DEVC, &snoop);
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