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Diffstat (limited to 'arch/arm/mach-rockchip/platsmp.c')
-rw-r--r--arch/arm/mach-rockchip/platsmp.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 01b3e3683..3e7a4b761 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -100,7 +100,7 @@ static int pmu_set_power_domain(int pd, bool on)
ret = pmu_power_domain_is_on(pd);
if (ret < 0) {
pr_err("%s: could not read power domain state\n",
- __func__);
+ __func__);
return ret;
}
}
@@ -129,7 +129,7 @@ static int rockchip_boot_secondary(unsigned int cpu, struct task_struct *idle)
if (cpu >= ncores) {
pr_err("%s: cpu %d outside maximum number of cpus %d\n",
- __func__, cpu, ncores);
+ __func__, cpu, ncores);
return -ENXIO;
}
@@ -139,7 +139,8 @@ static int rockchip_boot_secondary(unsigned int cpu, struct task_struct *idle)
return ret;
if (read_cpuid_part() != ARM_CPU_PART_CORTEX_A9) {
- /* We communicate with the bootrom to active the cpus other
+ /*
+ * We communicate with the bootrom to active the cpus other
* than cpu0, after a blob of initialize code, they will
* stay at wfe state, once they are actived, they will check
* the mailbox:
@@ -148,7 +149,7 @@ static int rockchip_boot_secondary(unsigned int cpu, struct task_struct *idle)
* The cpu0 need to wait the other cpus other than cpu0 entering
* the wfe state.The wait time is affected by many aspects.
* (e.g: cpu frequency, bootrom frequency, sram frequency, ...)
- * */
+ */
mdelay(1); /* ensure the cpus other than cpu0 to startup */
writel(virt_to_phys(secondary_startup), sram_base_addr + 8);
@@ -320,6 +321,13 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
#ifdef CONFIG_HOTPLUG_CPU
static int rockchip_cpu_kill(unsigned int cpu)
{
+ /*
+ * We need a delay here to ensure that the dying CPU can finish
+ * executing v7_coherency_exit() and reach the WFI/WFE state
+ * prior to having the power domain disabled.
+ */
+ mdelay(1);
+
pmu_set_power_domain(0 + cpu, false);
return 1;
}
@@ -327,7 +335,7 @@ static int rockchip_cpu_kill(unsigned int cpu)
static void rockchip_cpu_die(unsigned int cpu)
{
v7_exit_coherency_flush(louis);
- while(1)
+ while (1)
cpu_do_idle();
}
#endif
@@ -340,4 +348,5 @@ static struct smp_operations rockchip_smp_ops __initdata = {
.cpu_die = rockchip_cpu_die,
#endif
};
+
CPU_METHOD_OF_DECLARE(rk3066_smp, "rockchip,rk3066-smp", &rockchip_smp_ops);