[U-Boot] [PATCH] keystone2: add wfi in to the core_spin loop
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@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)
On Wed, Jul 08, 2015 at 11:40:14AM -0400, Vitaly Andrianov wrote:
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@ti.com
Reviewed-by: Tom Rini trini@konsulko.com
On Wed, Jul 08, 2015 at 11:40:14AM -0400, Vitaly Andrianov wrote:
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@ti.com Reviewed-by: Tom Rini trini@konsulko.com
Applied to u-boot/master, thanks!
participants (2)
-
Tom Rini -
Vitaly Andrianov