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For cs8409, it is required to run Jack Detect on resume. Jack Detect on cs8409+cs42l42 requires an interrupt from cs42l42 to be sent to cs8409 which is propogated to the driver via an unsolicited event. However, the hda_codec drops unsolicited events if the power_state is not set to PMSG_ON. Which is set at the end of the resume call. This means there is a race condition between setting power_state to PMSG_ON and receiving the interrupt. To solve this, we can add an API to set the power_state earlier and call that before we start Jack Detect. This does not cause issues, since we know inside our driver that we are already initialized, and ready to handle the unsolicited events. Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com> Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com> Cc: <stable@vger.kernel.org> # v5.15+ Link: https://lore.kernel.org/r/20211128115558.71683-1-vitalyr@opensource.cirrus.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.