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Introduce system suspend call that enables the ti_sci driver to support low power mode when the user space issues a suspend to mem. The following power management operations defined in the TISCI Low Power Mode API [1] are implemented to support suspend and resume: 1) TISCI_MSG_PREPARE_SLEEP Prepare the SOC for entering into a low power mode and provide details to firmware about the state being entered. 2) TISCI_MSG_SET_IO_ISOLATION Control the IO isolation for Low Power Mode. Also, write a ti_sci_prepare_system_suspend call to be used in the driver suspend handler to allow the system to identify the low power mode being entered and if necessary, send TISCI_MSG_PREPARE_SLEEP with information about the mode being entered. Sysfw version >= 10.00.04 support LPM_DM_MANAGED capability [2], where Device Mgr firmware now manages which low power mode is chosen. Going forward, this is the default configuration supported for TI AM62 family of devices. The state chosen by the DM can be influenced by sending constraints using the new LPM constraint APIs. In case the firmware does not support LPM_DM_MANAGED mode, the mode selection logic can be extended as needed. If no suspend-to-RAM modes are supported, return without taking any action. We're using "pm_suspend_target_state" to map the kernel's target suspend state to SysFW low power mode. Make sure this is available only when CONFIG_SUSPEND is enabled. Suspend has to be split into two parts, ti_sci_suspend() will send the prepare sleep message to prepare suspend. ti_sci_suspend_noirq() sets IO isolation which needs to be done as late as possible to avoid any issues. On resume this has to be done as early as possible. [1] https://software-dl.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html Co-developed-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Georgi Vlaev <g-vlaev@ti.com> Signed-off-by: Dhruva Gole <d-gole@ti.com> Signed-off-by: Vibhore Vardhan <vibhore@ti.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com> Tested-by: Dhruva Gole <d-gole@ti.com> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com> Tested-by: Roger Quadros <rogerq@kernel.org> Link: https://lore.kernel.org/r/20241007-tisci-syssuspendresume-v13-3-ed54cd659a49@baylibre.com Signed-off-by: Nishanth Menon <nm@ti.com> |
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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.