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platform_drv: disable no snoop for ATI/AMD HDA
Implemented as depicted in the OpenBSD driver, register description found in 'AMD SB700/710/750 Register Reference Guide' (43009_sb7xx_rrg_pub_1.00.pdf). Issue #4629.
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@ -38,6 +38,11 @@ void Driver::pci_hd_audio_quirks(Device::Pci_config cfg,
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struct No_snoop : Bitfield<11,1> {};
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};
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struct Amd_device_control : Register<0x42, 8>
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{
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struct No_snoop : Bitfield<0, 3> {};
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};
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using Mmio::Mmio;
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};
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@ -48,5 +53,8 @@ void Driver::pci_hd_audio_quirks(Device::Pci_config cfg,
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if (cfg.vendor_id == 0x8086)
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audio.write<Hdaudio::Intel_device_control::No_snoop>(0);
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if (cfg.vendor_id == 0x1002 || cfg.vendor_id == 0x1022)
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audio.write<Hdaudio::Amd_device_control::No_snoop>(2);
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}
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