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Date: Mon, 4 Aug 2008 17:57:18 +0800 From: "peerchen" <peerchen@...il.com> To: "linux-kernel" <linux-kernel@...r.kernel.org>, "alsa-devel" <alsa-devel@...a-project.org> Cc: "akpm" <akpm@...ux-foundation.org>, "pchen" <pchen@...dia.com> 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@...il.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); - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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