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

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Message-Id: <1408444228-23733-1-git-send-email-mathias.nyman@linux.intel.com>
Date:	Tue, 19 Aug 2014 13:30:28 +0300
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Linus <linus.walleij@...aro.org>
Cc:	<mika.westerberg@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH] gpio-lynxpoint: enable input sensing in resume

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@...el.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
---
 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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