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

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Message-Id: <1460120039-2497-4-git-send-email-linux@roeck-us.net>
Date:	Fri,  8 Apr 2016 05:53:56 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: [PATCH 3/6] ARM: PSCI: Register with kernel restart handler

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.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
It might make sense to introduce a restart-priority property for devicetree
based configurations, but I am not sure if this would be acceptable.

 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..99fab3ac3fd5 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 *np, 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