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In Xe3_LPD, display audio has the core audio logic located in PG0 and
per-transcoder logic in the same power well that provides power for the
transcoder [1].
For stuff like audio device enumeration, we need to ensure that PG0 is
turned on. For playback, we additionally need the transcoder's power
well to be enabled.
That essentially means that, for audio playback, there isn't a special
power well that needs to be enabled, because modeset sequences will
ensure that the required power wells are enabled.
That said, there might be cases where PG0 could be disabled due to
display entering DC6 while the audio driver tries to interact with the
graphics driver for stuff like audio device enumeration.
We recently hit that kind of scenario, where "aplay -l" was being used
to enumerate audio devices on a PTL machine with PSR enabled and no
external displays attached.
Since intel_audio_component_get_power() uses
POWER_DOMAIN_AUDIO_PLAYBACK, make sure to map that power domain to
DC_off power well, so that we disable dynamic DC states (which includes
DC6) while the audio driver needs display audio power.
[1] The core-audio vs per-transcoder logic split is not really new in
Xe3_LPD. This is also true for previous display generations. We need
to figure out the correct version where this split happened so that
we can apply fixes in the current power domain mapping.
Bspec: 72519
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250227-xe3lpd-power-domain-audio-playback-v1-1-5765f21da977@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
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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.