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Some systems expose HD-Audio controllers via objects in the ACPI tables
which encapsulate the controller's interrupt and the base address for the
HDA registers in an ACPI _CRS object, for example, as listed in this ACPI
table dump excerpt:
Device (HDA0)
{
Name (_HID, "NVDA2014") // _HID: Hardware ID
...
Name (_CRS, ResourceTemplate ()
// _CRS: Current Resource Settings
{
Memory32Fixed (ReadWrite,
0x36078000, // Address Base
0x00008000, // Address Length
)
Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive,
,, )
{
0x0000021E,
}
})
}
Add support for HDA controllers discovered through ACPI, including support
for some platforms which expose such HDA controllers on NVIDIA SoCs. This
is done with a new driver which uses existing infrastructure for extracting
resource information from _CRS objects and plumbs the parsed resource
information through to the existing HDA infrastructure to enable HD-Audio
functionality on such devices.
Although this driver is in the sound/pci/hda/ directory, it targets devices
which are not actually enumerated on the PCI bus. This is because it
depends upon the Intel "Azalia" infrastructure which has traditionally been
usedvfor PCI-based devices.
Signed-off-by: Daniel Dadap <ddadap@nvidia.com>
Link: https://patch.msgid.link/aC3ksXJUM9DlKiz6@ddadap-lakeline.nvidia.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.