For Intel platforms, it uses the ACPI matching tables to determine the correct machine driver to load. The probe callback in the SOF PCI/APCI driver is responsible for allocating the platform data that is used to store the machine information including the PCI device ID, name, and the ACPI mach description. The SST driver and firmware should be used when the DSP is enabled and SOF firmware is not available for the platform.
SST is primarily used with older generations of Intel processors for which SOF firmware support is not available. The SST Audio implements an ASoC-compliant driver for Intel HD Audio hardware, utilizing the Intel SST firmware. The AZX driver should be used instead of SOF when the DSP is not used. The AZX driver is intended to be used with Intel HD Audio PCI hardware when the Audio DSP is disabled (e.g. These drivers include the Intel AZX HD Audio driver ( linux/sound/pci/hda) and the Intel SST Audio driver ( linux/sound/soc/intel/). The upstream Linux kernel has a few drivers that are related to the SOF-based audio driver stack described in this document. ASoC provides a modular architecture to share audio codec drivers across different SoC implementations, unify the controls provided to applications, and provide a common infrastructure to manage SoC audio component power and clocks. The ALSA System-on-Chip (ASoC) is a subsystem of ALSA. The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system.
A generic SOF subsystem is implemented in Linux as a subsystem of ALSA ASoC. SOF provides infrastructure, real-time control pieces, and audio drivers. Sound Open Firmware (SOF) is an open source audio Digital Signal Processing (DSP) firmware infrastructure and SDK. The Sound Open Firmware (SOF)-based audio driver stack consists of an architecture-independent SOF driver core, an SOF DSP driver for Intel High Definition Audio (HD-Audio) platforms, an ALSA System-on-Chip (ASoC)-compliant audio codec driver, and a hardware-specific machine driver. Support for High Definition Audio (HD-Audio)
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