linux-kernel - [RFC PATCH v1 6/7] regulator: set Power State Change Reason before hw_protection

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Date: Fri, 19 Jan 2024 14:25:20 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Sebastian Reichel <sre@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Lukasz Luba <lukasz.luba@....com>,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	Søren Andersen <san@...v.dk>
Subject: [RFC PATCH v1 6/7] regulator: set Power State Change Reason before hw_protection_shutdown()

Store the state change reason to some black box, for later
investigation.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/regulator/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a6cb84af989e..d8a45c89f14a 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -19,6 +19,7 @@
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
+#include <linux/pscr.h>
 #include <linux/reboot.h>
 #include <linux/regmap.h>
 #include <linux/regulator/of_regulator.h>
@@ -5074,6 +5075,7 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
 static void regulator_handle_critical(struct regulator_dev *rdev,
 				      unsigned long event)
 {
+	enum power_state_change_reason pscr;
 	const char *reason = NULL;
 
 	if (!rdev->constraints->system_critical)
@@ -5082,17 +5084,21 @@ static void regulator_handle_critical(struct regulator_dev *rdev,
 	switch (event) {
 	case REGULATOR_EVENT_UNDER_VOLTAGE:
 		reason = "System critical regulator: voltage drop detected";
+		pscr = PSCR_UNDER_VOLTAGE;
 		break;
 	case REGULATOR_EVENT_OVER_CURRENT:
 		reason = "System critical regulator: over-current detected";
+		pscr = PSCR_OVER_CURRENT;
 		break;
 	case REGULATOR_EVENT_FAIL:
 		reason = "System critical regulator: unknown error";
+		pscr = PSCR_REGULATOR_FAILURE;
 	}
 
 	if (!reason)
 		return;
 
+	set_power_state_change_reason(pscr);
 	hw_protection_shutdown(reason,
 			       rdev->constraints->uv_less_critical_window_ms);
 }
-- 
2.39.2