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fwk: SCP suspend execution until an interrupt occurs

Darryl Green requested to merge github/fork/girishpathak/wfe into master

Created by: girishpathak

Currently, the firmware is busy looping forever while waiting for any interrupts. This behaviour consumes power unnecessarily. To avoid the busy loop scenario the firmware will enter suspend state using WFE (Wait For Event) instruction. Any interrupt will wake up the CPU to handle new events.

Signed-off-by: Tarek El-Sherbiny tarek.el-sherbiny@arm.com Signed-off-by: Girish Pathak girish.pathak@arm.com Change-Id: I83508dcce721a6d3fb93fa598d03a4bb01331f00

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