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Commit 320dcc30 authored by Peer Chen's avatar Peer Chen Committed by Takashi Iwai
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ALSA: hda_intel: enable snoop for nvidia HDA controller 



Enable the snoop for nvidia hda controller to avoid data coherence issue.

Signed-off-by: default avatarPeer Chen <peerchen@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent f511b01c

sound/pci/hda/hda_intel.c

+9 −0
Original line number Diff line number Diff line
@@ -278,6 +278,9 @@ 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
@@ -900,6 +903,12 @@ static void azx_init_pci(struct azx *chip) 
		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);