3d6a89a6dc
Existing DSDT or SSDT platforms hard-code clock and frame shape
configurations. For validation, we'd like to use alternate
configurations. It's not always possible to generate new tables due to
missing symbols, and modifying existing objects usually leads to
AE_OBJECT_EXIST errors.
The mechanism suggested in this patch is to add a NEW ACPI controller
device with a different _ADR value. e.g.
Scope (_SB_.PC00.RP08.PXSX.HDAS) {
Device (SDWP)
{
Name (_ADR, 0x40000001) // _ADR: Address
The desired _ADR can be passed as a parameter with
options snd-intel-sdw-acpi sdw_ctrl_addr=0x40000001
This solution leads to minimal tables with just what the developers or
validation engineers need, and without overriding any of the existing
firmware definitions. It's consistent with the recommendation to
extend ACPI definitions and not redefine them with a risk of conflict.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20240208163750.92849-1-pierre-louis.bossart@linux.intel.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 Restructured Text 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.