[U-Boot] [PATCH] keystone2: add wfi in to the core_spin loop

[Vitaly Andrianov]

When core A turning of core B, via tetris DPSC it places the core
B DPSC into transitional state. The core B has to execute wfi instruction
to move its DPSC to the OFF state. This patch add such instruction.

Signed-off-by: Vitaly Andrianov <vitalya at ti.com>
---
 arch/arm/mach-keystone/cmd_mon.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-keystone/cmd_mon.c b/arch/arm/mach-keystone/cmd_mon.c
index f9f58a3..73ceb83 100644
--- a/arch/arm/mach-keystone/cmd_mon.c
+++ b/arch/arm/mach-keystone/cmd_mon.c
@@ -55,8 +55,13 @@ U_BOOT_CMD(mon_install, 2, 0, do_mon_install,
 
 static void core_spin(void)
 {
-	while (1)
-		; /* forever */;
+	while (1) {
+		asm volatile (
+			"dsb\n"
+			"isb\n"
+			"wfi\n"
+		);
+	}
 }
 
 int mon_power_on(int core_id, void *ep)
-- 
1.9.1