mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-06 07:27:23 -04:00
7b98a1efba
If we use a DAPM widget instead of mute_stream() to send the PLAY command we can issue the plays to multiple amps in parallel. With mute_stream each codec driver instance is called one at a time so we get N * PS0 delay time. DAPM does each stage on every widget in a card before moving to the next stage. So all amps will do the PRE_PMU then all will do the POST_PMU. The PLAY is sent in the PRE_PMU so that they all power-up in parallel. After the PS0 wait in the first POST_PMU all the other amps will also be ready so there won't be any extra delay, or it will be negligible. There's also no point waiting for the MBOX ack in the PRE_PMU. We won't see a PS0 state in POST_PMU if it didn't ack the PLAY command. So we can save a little extra time. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://lore.kernel.org/r/20230411152528.329803-3-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org>
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.