[PATCH 2/5] drivers: firmware: psci: Register with kernel restart handler
From: Lee Jones <hidden>
Date: 2021-06-04 14:05:07
Also in:
lkml, xen-devel
Subsystem:
power state coordination interface (psci), the rest · Maintainers:
Mark Rutland, Lorenzo Pieralisi, Linus Torvalds
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 <redacted> Signed-off-by: Thierry Reding <redacted> Signed-off-by: Lee Jones <redacted> --- drivers/firmware/psci/psci.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index 3c1c5daf6df2e..18a47c9d5b02b 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c@@ -296,7 +296,8 @@ 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) { if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) && psci_system_reset2_supported) {
@@ -309,8 +310,15 @@ static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) } else { 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);
@@ -472,7 +480,7 @@ static void __init psci_0_2_set_functions(void) .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; }
--
2.31.1
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