[PATCH v2 3/6] ARM: PSCI: Register with kernel restart handler

From: Guenter Roeck
Date: Thu Apr 14 2016 - 22:43:40 EST


Register with kernel restart handler instead of setting arm_pm_restart
directly. This enables support for replacing the PSCI restart handler
with a different handler if necessary for a specific board.

Select a priority of 129 to indicate a higher than default priority, but
keep it as low as possible since PSCI reset is known to fail on some
boards.

Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Tested-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: Rebased to v4.6-rc3, added Reviewed/by/Acked-by/Tested-by tags
Variable name change: np -> nb

drivers/firmware/psci.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 11bfee8b79a9..a0f71480f145 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -231,11 +231,18 @@ static int get_set_conduit_method(struct device_node *np)
return 0;
}

-static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
+static int psci_sys_reset(struct notifier_block *nb, unsigned long action,
+ void *data)
{
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
+ return NOTIFY_DONE;
}

+static struct notifier_block psci_sys_reset_nb = {
+ .notifier_call = psci_sys_reset,
+ .priority = 129,
+};
+
static void psci_sys_poweroff(void)
{
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
@@ -461,7 +468,7 @@ static void __init psci_0_2_set_functions(void)

psci_ops.migrate_info_type = psci_migrate_info_type;

- arm_pm_restart = psci_sys_reset;
+ register_restart_handler(&psci_sys_reset_nb);

pm_power_off = psci_sys_poweroff;
}
--
2.5.0