docs/design_documents/psci_osi_mode.rst

30 PSCI supports two modes of power state coordination: platform-coordinated and
39 In platform-coordinated mode, the platform is responsible for coordinating power
56 platform-coordinated mode for a platform.
61 In platform-coordinated mode, each core independently selects their own local
75 In platform-coordinated mode, the OS doesn't have visibility when the last core
79 This could result in a design smell where the platform is using
80 platform-coordinated mode when it should be using OS-initiated mode instead.
85 the OS and the platform.
101   * For their Chrome OS platforms, they're using platform-coordinated mode in
106   * They're using platform-coordinated mode in TF-A with custom driver logic to
154    :param mode: 0 indicates platform-coordinated mode, 1 indicates OS-initiated
162 Switching from platform-coordinated to OS-initiated is only allowed if the
174 Switching from OS-initiated to platform-coordinated is only allowed if all cores
206 In platform-coordinated mode, the PSCI implementation coordinates requests from
276 CPU_OFF is always platform-coordinated, regardless of whether the power state
277 coordination mode for suspend is platform-coordinated or OS-initiated. If all
289 Current implementation of platform-coordinated mode
299   * This function calls a platform specific ``validate_power_state`` handler,
318   * This is a platform specific handler that takes the ``state_info`` object
327 * Add a boolean build option ``PSCI_OS_INIT_MODE`` for a platform to enable
342 * Since ``psci_validate_power_state`` calls a platform specific
343   ``validate_power_state`` handler, the platform implementation should populate
371   ``plat_psci_ops_t`` to allow the platform to optionally perform validations
374 * The platform specific ``pwr_domain_suspend`` handler remains unchanged.
388 This has been enabled and verified on the FVP_Base_RevC-2xAEMvA platform and
395 The proposed patches have been tested and verified on the STM32MP15 platform,
471 The proposed patches have been tested and verified on the SC7280 platform by
711 OS-initiated mode was able to scale better than platform-coordinated mode for
714 results for a single CPU than in platform-coordinated mode.