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Peng Fan
ff555fc553
On some NXP platforms (e.g i.MX7ULP) the poweroff and reboot operations are done via a separate remote core. Typically Linux needs to send a message to the remote core and requests for poweroff or reboot. By default the communication between Linux core and the remote core is is done via a blocking mailbox mechanism but Linux doesn't allow blocking operations in the system off (reboot, power off) handlers. So, we need to make sure the mailbox message send operations do not block for this specific operations. Fortunately, Linux allows us to register handlers that are called in preparation of the system off operations. Thus, before carrying the power off or reboot preparations, just destroy the existing mailboxes and create them as non-blocking. Note that power off and restart are totally different operations and are not complementary. We introduce a new flag in the imx remoteproc per device data which tells us when a device needs this special setup. For now, only imx7ulp needs it. Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com> Link: https://lore.kernel.org/r/20240822-imx_rproc-v3-2-6d943723945d@nxp.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.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 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.