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To allow subsequent changes to implement support for OSI mode through the cpuidle-psci driver, export the existing psci_has_osi_support(). Export also a new function, psci_set_osi_mode(), that allows its caller to enable the OS-initiated CPU-suspend mode in the PSCI FW. To deal with backwards compatibility for a kernel started through a kexec call, default to set the CPU-suspend mode to the Platform Coordinated mode during boot. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>