From da3fb9c94f8dc57c2a89d0aa00ae88650b98337b Mon Sep 17 00:00:00 2001
From: Masayuki Ishikawa <masayuki.ishikawa@gmail.com>
Date: Fri, 6 Mar 2020 13:00:37 +0900
Subject: [PATCH] arch: xtensa: Call the waiti instruction in up_idle()

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
---
 arch/xtensa/src/common/xtensa_idle.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/xtensa/src/common/xtensa_idle.c b/arch/xtensa/src/common/xtensa_idle.c
index f6e2c3f29f..9ac16d4e6c 100644
--- a/arch/xtensa/src/common/xtensa_idle.c
+++ b/arch/xtensa/src/common/xtensa_idle.c
@@ -92,4 +92,11 @@ void up_idle(void)
   leave_critical_section(flags);
 #endif
 #endif
+
+  /* This would be an appropriate place to put some MCU-specific logic to
+   * sleep in a reduced power mode until an interrupt occurs to save power
+   */
+
+  asm("waiti 0");
+
 }