[PATCH] gpio-lynxpoint: enable input sensing in resume

From: Mathias Nyman
Date: Tue Aug 19 2014 - 06:17:47 EST


It appears that input sensing bit might be reset during
suspend/resume. Set input sensing again for all requested gpios
in resume

Tested-by: Jerome Blin <jerome.blin@xxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
drivers/gpio/gpio-lynxpoint.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/gpio/gpio-lynxpoint.c b/drivers/gpio/gpio-lynxpoint.c
index ff9eb91..4165672 100644
--- a/drivers/gpio/gpio-lynxpoint.c
+++ b/drivers/gpio/gpio-lynxpoint.c
@@ -407,9 +407,33 @@ static int lp_gpio_runtime_resume(struct device *dev)
return 0;
}

+static int lp_gpio_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int lp_gpio_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct lp_gpio *lg = platform_get_drvdata(pdev);
+ unsigned long reg;
+ int i;
+
+ /* on some hardware suspend clears input sensing, re-enable it here */
+ for (i = 0; i < lg->chip.ngpio; i++) {
+ if (gpiochip_is_requested(&lg->chip, i) != NULL) {
+ reg = lp_gpio_reg(&lg->chip, i, LP_CONFIG2);
+ outl(inl(reg) & ~GPINDIS_BIT, reg);
+ }
+ }
+ return 0;
+}
+
static const struct dev_pm_ops lp_gpio_pm_ops = {
.runtime_suspend = lp_gpio_runtime_suspend,
.runtime_resume = lp_gpio_runtime_resume,
+ .suspend = lp_gpio_suspend,
+ .resume = lp_gpio_resume,
};

static const struct acpi_device_id lynxpoint_gpio_acpi_match[] = {
--
1.8.3.2

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