@@ -16,30 +16,25 @@
#include "cpuidle.h"
#include "hardware.h"
-static atomic_t master = ATOMIC_INIT(0);
+static int master = 0;
static DEFINE_SPINLOCK(master_lock);
static int imx6q_enter_wait(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
- if (atomic_inc_return(&master) == num_online_cpus()) {
- /*
- * With this lock, we prevent other cpu to exit and enter
- * this function again and become the master.
- */
- if (!spin_trylock(&master_lock))
- goto idle;
+ spin_lock(&master_lock);
+ if (++master == num_online_cpus()) {
imx6_set_lpm(WAIT_UNCLOCKED);
- cpu_do_idle();
- imx6_set_lpm(WAIT_CLOCKED);
- spin_unlock(&master_lock);
- goto done;
}
+ spin_unlock(&master_lock);
-idle:
cpu_do_idle();
-done:
- atomic_dec(&master);
+
+ spin_lock(&master_lock);
+ if (master-- == num_online_cpus()) {
+ imx6_set_lpm(WAIT_CLOCKED);
+ }
+ spin_unlock(&master_lock);
return index;
}
In the current cpuidle implementation for i.MX6q, the CPU that sets "WAIT_UNCLOCKED" and the CPU that returns to "WAIT_CLOCKED" are always the same. While the CPU that sets "WAIT_UNCLOCKED" is in IDLE state of "WAIT", if the other CPU wakes up and enters IDLE state of "WFI" istead of "WAIT", this CPU can not wake up at expired time. Because, in the case of "WFI", the CPU must be waked up by the local timer interrupt. But, while "WAIT_UNCLOCKED" is set, the local timer is stopped, when all CPUs execute "wfi" instruction. As a result, the local timer interrupt is not fired at the expected time. In this situation, this CPU will wake up by IRQ different from local timer. (e.g. broacast tiemr) So, this fix changes CPU to return to "WAIT_CLOCKED". Signed-off-by: Kohji Okuno <okuno.kohji@jp.panasonic.com> --- arch/arm/mach-imx/cpuidle-imx6q.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-)