soc: nordic: vpr: finish pending transactions before calling `wfi`
To minimize time the CPU spends when preparing for sleep, make sure
the pending transactions are finished before calling `wfi`.
Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>
diff --git a/soc/nordic/common/vpr/soc_idle.c b/soc/nordic/common/vpr/soc_idle.c
index f5f7712..a5c7378 100644
--- a/soc/nordic/common/vpr/soc_idle.c
+++ b/soc/nordic/common/vpr/soc_idle.c
@@ -4,6 +4,7 @@
*/
#include <zephyr/irq.h>
+#include <zephyr/sys/barrier.h>
#include <zephyr/tracing/tracing.h>
/*
@@ -13,6 +14,7 @@
void arch_cpu_idle(void)
{
sys_trace_idle();
+ barrier_dsync_fence_full();
irq_unlock(MSTATUS_IEN);
__asm__ volatile("wfi");
}
@@ -20,6 +22,7 @@
void arch_cpu_atomic_idle(unsigned int key)
{
sys_trace_idle();
+ barrier_dsync_fence_full();
irq_unlock(MSTATUS_IEN);
__asm__ volatile("wfi");
