[PATCH V3 03/17] gpio: tegra: use resume_noirq for tegra gpio resume

[Sowjanya Komatineni]

During SC7 resume, PARKED bit clear from the pinmux registers may
cause a glitch on the GPIO lines.

So, Tegra GPIOs restore should happen prior to restoring Tegra pinmux
to keep the GPIO lines in a known good state prior to clearing PARKED
bit.

This patch has fix for this by moving Tegra GPIO restore to happen
during resume_noirq.

Signed-off-by: Sowjanya Komatineni <skomatin...@nvidia.com>
---
 drivers/gpio/gpio-tegra.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index f57bfc07ae22..f3c58c597ab9 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -410,7 +410,7 @@ static void tegra_gpio_irq_handler(struct irq_desc *desc)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int tegra_gpio_resume(struct device *dev)
+static int tegra_gpio_resume_noirq(struct device *dev)
 {
        struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
        unsigned long flags;
@@ -506,6 +506,15 @@ static int tegra_gpio_irq_set_wake(struct irq_data *d, 
unsigned int enable)
 
        return irq_set_irq_wake(bank->irq, enable);
 }
+
+static const struct dev_pm_ops tegra_gpio_pm_ops = {
+       .suspend = &tegra_gpio_suspend,
+       .resume_noirq = &tegra_gpio_resume_noirq
+};
+
+#define TEGRA_GPIO_PM  (&tegra_gpio_pm_ops)
+#else
+#define TEGRA_GPIO_PM  NULL
 #endif
 
 #ifdef CONFIG_DEBUG_FS
@@ -553,10 +562,6 @@ static inline void tegra_gpio_debuginit(struct 
tegra_gpio_info *tgi)
 
 #endif
 
-static const struct dev_pm_ops tegra_gpio_pm_ops = {
-       SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
-};
-
 static int tegra_gpio_probe(struct platform_device *pdev)
 {
        struct tegra_gpio_info *tgi;
@@ -706,7 +711,7 @@ static const struct of_device_id tegra_gpio_of_match[] = {
 static struct platform_driver tegra_gpio_driver = {
        .driver         = {
                .name   = "tegra-gpio",
-               .pm     = &tegra_gpio_pm_ops,
+               .pm     = TEGRA_GPIO_PM,
                .of_match_table = tegra_gpio_of_match,
        },
        .probe          = tegra_gpio_probe,
-- 
2.7.4