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firmware: psci: Export functions to manage the OSI mode

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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>
This commit is contained in:
Ulf Hansson 2019-10-10 12:01:48 +02:00
parent a3f048b542
commit 49fdcd7577
2 changed files with 18 additions and 2 deletions
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2
include/linux/psci.h
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@ -18,6 +18,8 @@ bool psci_tos_resident_on(int cpu);
int psci_cpu_suspend_enter(u32 state);
bool psci_power_state_is_valid(u32 state);
int psci_set_osi_mode(void);
bool psci_has_osi_support(void);
enum smccc_version {
SMCCC_VERSION_1_0,