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rpi3/4: Add support for offlining CPUs 

The hooks were populated but the power down left the CPU in limbo-land.
What we need to do - until there is a way to actually power off - is to
turn off the MMU and enter the spinning loop as if we were cold-booted.
This allows the on-call to pick up the CPU again.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Change-Id: Iefc7a58424e3578ad3dd355a7bd6eaba4b412699
This commit is contained in:
Jan Kiszka 2019-12-08 20:48:46 +01:00
parent 87b582ef5b
commit 9e78cb189a
1 changed files with 10 additions and 0 deletions
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10
plat/rpi/common/rpi3_pm.c
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@ -123,6 +123,15 @@ static void rpi3_pwr_domain_off(const psci_power_state_t *target_state)
#endif
}
void __dead2 plat_secondary_cold_boot_setup(void);
static void __dead2
rpi3_pwr_domain_pwr_down_wfi(const psci_power_state_t *target_state)
{
disable_mmu_el3();
plat_secondary_cold_boot_setup();
}
/*******************************************************************************
* Platform handler called when a power domain is about to be turned on. The
* mpidr determines the CPU to be turned on.
@ -224,6 +233,7 @@ static void __dead2 rpi3_system_off(void)
static const plat_psci_ops_t plat_rpi3_psci_pm_ops = {
.cpu_standby = rpi3_cpu_standby,
.pwr_domain_off = rpi3_pwr_domain_off,
.pwr_domain_pwr_down_wfi = rpi3_pwr_domain_pwr_down_wfi,
.pwr_domain_on = rpi3_pwr_domain_on,
.pwr_domain_on_finish = rpi3_pwr_domain_on_finish,
.system_off = rpi3_system_off,