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| author | Vitaly Andrianov <vitalya@ti.com> | 2015-07-08 11:40:14 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-07-27 15:01:57 -0400 |
| commit | 17c5bda2a91cf902e0897bd8178f96aa5e3adf78 (patch) | |
| tree | c62277f1f728bd1d6c2d72c5ed36c66b6d07b79f /arch/arm | |
| parent | f5df36d0c80eafee94d14e33a01f0f693f041a3c (diff) | |
| download | u-boot-17c5bda2a91cf902e0897bd8178f96aa5e3adf78.zip u-boot-17c5bda2a91cf902e0897bd8178f96aa5e3adf78.tar.gz u-boot-17c5bda2a91cf902e0897bd8178f96aa5e3adf78.tar.bz2 | |
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>
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-keystone/cmd_mon.c | 9 |
1 files 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) |