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Kernel: Report AC'97 vendor and device ID

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This commit is contained in:
Jelle Raaijmakers 2022-02-27 20:45:21 +01:00 • committed by Linus Groh
parent 9fcd3f7920
commit 4f91616759
2 changed files with 14 additions and 9 deletions
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21
Kernel/Devices/Audio/AC97.cpp
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@ -78,10 +78,20 @@ UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize()
dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", pci_address(), m_io_mixer_base.get());
dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", pci_address(), m_io_bus_base.get());
enable_pin_based_interrupts();
PCI::enable_bus_mastering(pci_address());
// Read out AC'97 codec revision and vendor
auto extended_audio_id = m_io_mixer_base.offset(NativeAudioMixerRegister::ExtendedAudioID).in<u16>();
m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
dbgln_if(AC97_DEBUG, "AC97 @ {}: codec revision {:#02b}", pci_address(), to_underlying(m_codec_revision));
if (m_codec_revision == AC97Revision::Reserved)
return ENOTSUP;
// Report vendor / device ID
u32 vendor_id = m_io_mixer_base.offset(NativeAudioMixerRegister::VendorID1).in<u16>() << 16 | m_io_mixer_base.offset(NativeAudioMixerRegister::VendorID2).in<u16>();
dbgln("AC97 @ {}: Vendor ID: {:#8x}", pci_address(), vendor_id);
// Bus cold reset, enable interrupts
enable_pin_based_interrupts();
PCI::enable_bus_mastering(pci_address());
auto control = m_io_bus_base.offset(NativeAudioBusRegister::GlobalControl).in<u32>();
control |= GlobalControlFlag::GPIInterruptEnable;
control |= GlobalControlFlag::AC97ColdReset;
@ -90,13 +100,6 @@ UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize()
// Reset mixer
m_io_mixer_base.offset(NativeAudioMixerRegister::Reset).out<u16>(1);
// Read out AC'97 codec revision
auto extended_audio_id = m_io_mixer_base.offset(NativeAudioMixerRegister::ExtendedAudioID).in<u16>();
m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
dbgln_if(AC97_DEBUG, "AC97 @ {}: codec revision {:#02b}", pci_address(), to_underlying(m_codec_revision));
if (m_codec_revision == AC97Revision::Reserved)
return ENOTSUP;
// Enable variable and double rate PCM audio if supported
auto extended_audio_status_control_register = m_io_mixer_base.offset(NativeAudioMixerRegister::ExtendedAudioStatusControl);
auto extended_audio_status = extended_audio_status_control_register.in<u16>();

2
Kernel/Devices/Audio/AC97.h
View file

@ -40,6 +40,8 @@ private:
ExtendedAudioID = 0x28,
ExtendedAudioStatusControl = 0x2a,
PCMFrontDACRate = 0x2c,
VendorID1 = 0x7c,
VendorID2 = 0x7e,
};
enum ExtendedAudioMask : u16 {