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Subject[PATCH 3/6] drivers: firmware: psci: Register with kernel restart handler
Date
From: Guenter Roeck <linux@roeck-us.net>

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@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
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 66a8793f3b37..ce9814462ce0 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -232,11 +232,18 @@ 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);
@@ -513,7 +520,7 @@ 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;
}
--
2.11.0
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