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Hikey960: fix PSCI suspend stuck issue

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Clear the cpuidle flag when resuming from idle. This flag is set
when entering idle, and if it remains set when resuming, it can
prevent the cluster from powering off during the next system
suspend operation. During system suspend, all CPUs are plugged
out except the last CPU, which is suspended. If any of the
cpuidle flags are set at this point, the last CPU will be stuck
in a WFI loop and will not be powered off.
This problem only occurs during system suspend.

Signed-off-by: Tao Wang <kevin.wangtao@linaro.org>
This commit is contained in:
Tao Wang 2017-08-03 17:34:09 +08:00 • committed by Tao Wang
parent ca9915c2bb
commit 4af7fcb8d4
1 changed files with 5 additions and 0 deletions
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5
plat/hisilicon/hikey960/hikey960_pm.c
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@ -250,6 +250,7 @@ static void
hikey960_pwr_domain_suspend_finish(const psci_power_state_t *target_state)
{
unsigned long mpidr = read_mpidr_el1();
unsigned int core = mpidr & MPIDR_CPU_MASK;
unsigned int cluster =
(mpidr & MPIDR_CLUSTER_MASK) >> MPIDR_AFFINITY_BITS;
@ -257,6 +258,10 @@ hikey960_pwr_domain_suspend_finish(const psci_power_state_t *target_state)
if (CORE_PWR_STATE(target_state) != PLAT_MAX_OFF_STATE)
return;
hisi_cpuidle_lock(cluster, core);
hisi_clear_cpuidle_flag(cluster, core);
hisi_cpuidle_unlock(cluster, core);
if (hisi_test_ap_suspend_flag(cluster)) {
hikey960_sr_dma_reinit();
gicv2_cpuif_enable();