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gpio: mxc: move gpio noirq suspend/resume to syscore phase 

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.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Anson Huang 2018-11-09 04:56:56 +00:00 committed by Linus Walleij
parent eee3919c5f
commit 1a5287a3db
1 changed files with 24 additions and 15 deletions
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31
drivers/gpio/gpio-mxc.c
View File

@ -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>
@ -550,31 +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 mxc_gpio_port *port = dev_get_drvdata(dev);
struct mxc_gpio_port *port;
/* 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 mxc_gpio_port *port = dev_get_drvdata(dev);
struct mxc_gpio_port *port;
int ret;
/* walk through all ports */
list_for_each_entry(port, &mxc_gpio_ports, node) {
ret = clk_prepare_enable(port->clk);
if (ret)
return ret;
if (ret) {
pr_err("mxc: failed to enable gpio clock %d\n", ret);
return;
}
mxc_gpio_restore_regs(port);
return 0;
}
}
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 = {
@ -582,7 +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,
@ -590,6 +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);