Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
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>
authored by Peer Chen and committed by Takashi Iwai 320dcc30 f511b01c
+9
sound/pci/hda/hda_intel.c
+9
sound/pci/hda/hda_intel.c
···
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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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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);