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regulator: Introduce handling for system-critical under-voltage events

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Handle under-voltage events for crucial regulators to maintain system
stability and avoid issues during power drops.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20231026144824.4065145-3-o.rempel@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Oleksij Rempel 2023-10-26 16:48:21 +02:00 committed by Mark Brown
parent 0e1c8dcbde
commit 8156c7dd47
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GPG Key ID: 24D68B725D5487D0
3 changed files with 50 additions and 0 deletions
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38
drivers/regulator/core.c
View File

@ -19,6 +19,7 @@
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/consumer.h>
@ -5061,6 +5062,41 @@ void regulator_bulk_free(int num_consumers,
}
EXPORT_SYMBOL_GPL(regulator_bulk_free);
/**
* regulator_handle_critical - Handle events for system-critical regulators.
* @rdev: The regulator device.
* @event: The event being handled.
*
* This function handles critical events such as under-voltage, over-current,
* and unknown errors for regulators deemed system-critical. On detecting such
* events, it triggers a hardware protection shutdown with a defined timeout.
*/
static void regulator_handle_critical(struct regulator_dev *rdev,
unsigned long event)
{
const char *reason = NULL;
if (!rdev->constraints->system_critical)
return;
switch (event) {
case REGULATOR_EVENT_UNDER_VOLTAGE:
reason = "System critical regulator: voltage drop detected";
break;
case REGULATOR_EVENT_OVER_CURRENT:
reason = "System critical regulator: over-current detected";
break;
case REGULATOR_EVENT_FAIL:
reason = "System critical regulator: unknown error";
}
if (!reason)
return;
hw_protection_shutdown(reason,
REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS);
}
/**
* regulator_notifier_call_chain - call regulator event notifier
* @rdev: regulator source
@ -5073,6 +5109,8 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
int regulator_notifier_call_chain(struct regulator_dev *rdev,
unsigned long event, void *data)
{
regulator_handle_critical(rdev, event);
_notifier_call_chain(rdev, event, data);
return NOTIFY_DONE;

2
drivers/regulator/of_regulator.c
View File

@ -131,6 +131,8 @@ static int of_get_regulation_constraints(struct device *dev,
constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
constraints->pull_down = of_property_read_bool(np, "regulator-pull-down");
constraints->system_critical = of_property_read_bool(np,
"system-critical-regulator");
if (of_property_read_bool(np, "regulator-allow-bypass"))
constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;

10
include/linux/regulator/machine.h
View File

@ -49,6 +49,13 @@ struct regulator;
#define DISABLE_IN_SUSPEND 1
#define ENABLE_IN_SUSPEND 2
/*
* Default time window (in milliseconds) following a critical under-voltage
* event during which less critical actions can be safely carried out by the
* system.
*/
#define REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS 10
/* Regulator active discharge flags */
enum regulator_active_discharge {
REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
@ -127,6 +134,8 @@ struct notification_limit {
* @ramp_disable: Disable ramp delay when initialising or when setting voltage.
* @soft_start: Enable soft start so that voltage ramps slowly.
* @pull_down: Enable pull down when regulator is disabled.
* @system_critical: Set if the regulator is critical to system stability or
* functionality.
* @over_current_protection: Auto disable on over current event.
*
* @over_current_detection: Configure over current limits.
@ -214,6 +223,7 @@ struct regulation_constraints {
unsigned ramp_disable:1; /* disable ramp delay */
unsigned soft_start:1; /* ramp voltage slowly */
unsigned pull_down:1; /* pull down resistor when regulator off */
unsigned system_critical:1; /* critical to system stability */
unsigned over_current_protection:1; /* auto disable on over current */
unsigned over_current_detection:1; /* notify on over current */
unsigned over_voltage_detection:1; /* notify on over voltage */