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When compressed and pcm session is started the buffer pull will Be from the DSP, in mmap mode for the scenario Hardware pointer Is same as application pointer implies application has not filled the Buffer to be send to DSP, and platform driver has to break and restart The de queue process when the application has sufficient buffers. When hardware pointer is same as application pointer it is an under run Scenario where the ALSA framework has to trigger the under run and in HAL The session has to re-prepare and re-triggered. based on the stop Threshold, but in our system the stop threshold is INT_MAX which Indicates that under run is not triggered in practical cases. We have a brodcast usecase in which the mentioned under run case Is hit mulitple times, and every time re-prepare and re-trigger will be Expensive Update the ASoC core framework to restart de queue process stopped By platform Driver when the under run is hit, based on the available Buffer and render flag, so the System will recover from the hang state. To restart de queue process the ASoC core will be calling the restart Callback registered by platform driver and this callback will be running in Atomic context. Test: build Bug: 151372815 Change-Id: Ic9ea05a0dc6246346e9913493232882e2f5447d1 Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org> Signed-off-by: Meng Wang <mwang@codeaurora.org> (cherry picked from commit ddbe60b879175f7260a910e77fc8e9e9369de84f) Signed-off-by: Hridya Valsaraju <hridya@google.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.