Merge "sx150x-pinctrl: Avoid i2c transfer during kexec" (ab7b2c4f) · Commits · e / devices / android_kernel_xiaomi_nabu

drivers/pinctrl/pinctrl-sx150x.c

+26 −1

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2019, The Linux Foundation. All rights reserved.
		* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
		*
		* Copyright (c) 2016, BayLibre, SAS. All rights reserved.
		* Author: Neil Armstrong <narmstrong@baylibre.com>
		@@ -40,6 +40,9 @@
		#include "pinconf.h"
		#include "pinctrl-utils.h"

		static bool in_kexec_panic;
		static struct notifier_block *panic_block;

		/* The chip models of sx150x */
		enum {
		SX150X_123 = 0,
		@@ -581,6 +584,14 @@ static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
		struct sx150x_pinctrl *pctl =
		gpiochip_get_data(irq_data_get_irq_chip_data(d));

		/* In crash kexec panic path interrupt is disabled.
		* Writing to regmap will need interrupt/polling mode,
		* as it goes though i2c.
		*/
		if (in_kexec_panic) {
		mutex_unlock(&pctl->lock);
		return;
		}
		regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
		regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
		mutex_unlock(&pctl->lock);
		@@ -1102,6 +1113,14 @@ const struct regmap_config sx150x_regmap_config = {
		.volatile_reg = sx150x_reg_volatile,
		};

		static int sx150x_panic_handler(struct notifier_block *this,
		unsigned long event, void *ptr)
		{
		if (crash_kexec_post_notifiers)
		in_kexec_panic = 1;
		return NOTIFY_DONE;
		}

		static int sx150x_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		@@ -1301,6 +1320,12 @@ static struct i2c_driver sx150x_driver = {

		static int __init sx150x_init(void)
		{
		panic_block = kzalloc(sizeof(*panic_block), GFP_KERNEL);
		if (!panic_block)
		return -ENOMEM;
		panic_block->notifier_call = sx150x_panic_handler;
		atomic_notifier_chain_register(&panic_notifier_list,
		panic_block);
		return i2c_add_driver(&sx150x_driver);
		}
		subsys_initcall(sx150x_init);