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d34886140c
This patch adds a new optional member `pwr_domain_validate_suspend` to the `plat_psci_ops_t` structure that allows a platform to optionally perform platform specific validations in OS-initiated mode. This is conditionally compiled into the build depending on the value of the `PSCI_OS_INIT_MODE` build option. In https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/17682, the return type of the `pwr_domain_suspend` handler was updated from `void` to `int` to allow a platform to optionally perform platform specific validations in OS-initiated mode. However, when an error code other than `PSCI_E_SUCCESS` is returned, the current exit path does not undo the operations in `psci_suspend_to_pwrdown_start`, and as a result, the system ends up in an unexpected state. The fix in this patch prevents the need to undo the operations in `psci_suspend_to_pwrdown_start`, by allowing the platform to first perform any necessary platform specific validations before the PSCI generic code proceeds to the point of no return where the CPU_SUSPEND request is expected to complete successfully. Change-Id: I05d92c7ea3f5364da09af630d44d78252185db20 Signed-off-by: Wing Li <wingers@google.com> |
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