[TF-A] About disable gic cpuif in psci suspend or off

Hi,

In ATF-A, I usually see below code in psci suspend or off code path:

/* Prevent interrupts from spuriously waking up this cpu */ plat_arm_gic_cpuif_disable();

But per my understanding, before calling psci_suspend(), the NW, e.g linux kernel has disabled all interrupts from cpu level, so here preventing interrupt is to prevent the interrupts from secure world?

Another question is: for Cortex A55, this is not necessary. Because CA55 TRM says when the core_pwrdn_en bit is set, executing WFI automatically masks all interrupts and wake-up events in the core. Am I right?

Thanks in advance