[PATCH] gpio: mxc: move gpio noirq suspend/resume to syscore phase

["Martin Hundebøll" <martin@geanix.com>]

From: Anson Huang <anson.huang@nxp.com>

commit 1a5287a3dbc34cd0c02c8f64c9131bd23cdfe2bb upstream.

During noirq suspend/resume phase, GPIO irq could arrive
and its registers like IMR will be changed by irq handle
process, to make the GPIO registers exactly when it is
powered ON after resume, move the GPIO noirq suspend/resume
callback to syscore suspend/resume phase, local irq is
disabled at this phase so GPIO registers are atomic.

Fixes: c19fdaeea0aa ("gpio: mxc: add power management support")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Martin Hundebøll <martin@geanix.com>
Cc: <stable@vger.kernel.org> # 4.19.x+
---

This patch fixes gpio wakeup from suspend on (at least) imx6ul and
imx6ull. The backport handles the conflict from commit 7f3f2b478cab
("gpio: gpio-mxc: simplify getting .driver_data").

 drivers/gpio/gpio-mxc.c | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 995cf0b9e0b1..2d1dfa1e0745 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -17,6 +17,7 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/syscore_ops.h>
 #include <linux/gpio/driver.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -550,33 +551,38 @@ static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
 	writel(port->gpio_saved_reg.dr, port->base + GPIO_DR);
 }
 
-static int __maybe_unused mxc_gpio_noirq_suspend(struct device *dev)
+static int mxc_gpio_syscore_suspend(void)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+	struct mxc_gpio_port *port;
 
-	mxc_gpio_save_regs(port);
-	clk_disable_unprepare(port->clk);
+	/* walk through all ports */
+	list_for_each_entry(port, &mxc_gpio_ports, node) {
+		mxc_gpio_save_regs(port);
+		clk_disable_unprepare(port->clk);
+	}
 
 	return 0;
 }
 
-static int __maybe_unused mxc_gpio_noirq_resume(struct device *dev)
+static void mxc_gpio_syscore_resume(void)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct mxc_gpio_port *port = platform_get_drvdata(pdev);
+	struct mxc_gpio_port *port;
 	int ret;
 
-	ret = clk_prepare_enable(port->clk);
-	if (ret)
-		return ret;
-	mxc_gpio_restore_regs(port);
-
-	return 0;
+	/* walk through all ports */
+	list_for_each_entry(port, &mxc_gpio_ports, node) {
+		ret = clk_prepare_enable(port->clk);
+		if (ret) {
+			pr_err("mxc: failed to enable gpio clock %d\n", ret);
+			return;
+		}
+		mxc_gpio_restore_regs(port);
+	}
 }
 
-static const struct dev_pm_ops mxc_gpio_dev_pm_ops = {
-	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume)
+static struct syscore_ops mxc_gpio_syscore_ops = {
+	.suspend = mxc_gpio_syscore_suspend,
+	.resume = mxc_gpio_syscore_resume,
 };
 
 static struct platform_driver mxc_gpio_driver = {
@@ -584,7 +590,6 @@ static struct platform_driver mxc_gpio_driver = {
 		.name	= "gpio-mxc",
 		.of_match_table = mxc_gpio_dt_ids,
 		.suppress_bind_attrs = true,
-		.pm = &mxc_gpio_dev_pm_ops,
 	},
 	.probe		= mxc_gpio_probe,
 	.id_table	= mxc_gpio_devtype,
@@ -592,6 +597,8 @@ static struct platform_driver mxc_gpio_driver = {
 
 static int __init gpio_mxc_init(void)
 {
+	register_syscore_ops(&mxc_gpio_syscore_ops);
+
 	return platform_driver_register(&mxc_gpio_driver);
 }
 subsys_initcall(gpio_mxc_init);
-- 
2.20.1