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When a wake event is defined to be triggered on both positive and negative edge of the input wake signal, it is crucial to know the current state of the signal when going into suspend. The intended way to obtain the current state of the wake signals is to read the WAKE_AOWAKE_SW_STATUS register, which should contains the raw state of the wake signals. However, this register is edge triggered, an edge will not be generated for signals that are already asserted prior to the assertion of WAKE_LATCH_SW. To workaround this, change the polarity of the wake level from '0' to '1' while latching the signals, as this will generate an edge for signals that are set to '1'. Signed-off-by: Stefan Kristiansson <stefank@nvidia.com> Signed-off-by: Petlozu Pravareshwar <petlozup@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.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.
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.