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Use the SoundWire link number and device unique ID as the firmware file qualifier suffix on CS35L57, CS35L63 and revisions of CS35L56 after B0. The change in wm_adsp needed to support this has been included in this patch because it is fairly trivial. Originally, the firmware file names indicated which amplifier instance they were for by appending the ALSA prefix string. This is the standard ASoC way of distinguishing different instances of the same device. However, on SoundWire systems the SoundWire physical unique address is available as a unique identifier for each amp, and this address is hardwired by a pin on the amp. The firmware files are specific for each physical amp so they must be applied to that amp. Using the ALSA prefix for the filename qualifier means that to name a firmware file it must be determined what prefix string the machine driver will assign to each device and then use that to name the firmware file correctly. This is straightforward in traditional ASoC systems where the machine driver is specific to a particular piece of hardware. But on SoundWire the machine driver is generic and can handle a very wide range of hardware. It is more difficult to determine exactly what the prefix will be on any particular production device, and more prone to mistakes. Also, when the machine driver switches to generating this automatically from SDCA properties in ACPI, there is an additional layer of complexity in determining the mapping. This uncertainty is unnecessary because the firmware is built for a specific amp. with known address, so we can use that directly instead of introducing the redundant intermediate alias. This ensures the firmware is applied to the amp it was intended for. There have not been any firmwares published for CS35L57 or CS35L63, so these can safely be switched to using the SoundWire unique address as the suffix string. Also note that the machine driver in older kernel version only has match entries for the CS35L56 Soundwire identity so any future product with a cs35L57 or CS35L63 would require a new kernel anyway. There are already many published firmware for CS35L56 B0 silicon so this keeps the original naming scheme on those, to preserve backward compatibility. Note that although sdw_slave.id contains a unique_id field, this cannot be trusted because the SoundWire core code also puts magic values into it that it uses as a flag. So the unique ID is read from the chip register. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://patch.msgid.link/20250612121428.1667-2-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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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.