[PATCH 4.9 144/310] pinctrl: baytrail: Enable glitch filter for GPIOs used as interrupts

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdegoede@xxxxxxxxxx>


[ Upstream commit 9291c65b01d1c67ebd56644cb19317ad665c44b3 ]

On some systems, some PCB traces attached to GpioInts are routed in such
a way that they pick up enough interference to constantly (many times per
second) trigger.

Enabling glitch-filtering fixes this.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/intel/pinctrl-baytrail.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -46,6 +46,9 @@
 #define BYT_TRIG_POS		BIT(25)
 #define BYT_TRIG_LVL		BIT(24)
 #define BYT_DEBOUNCE_EN		BIT(20)
+#define BYT_GLITCH_FILTER_EN	BIT(19)
+#define BYT_GLITCH_F_SLOW_CLK	BIT(17)
+#define BYT_GLITCH_F_FAST_CLK	BIT(16)
 #define BYT_PULL_STR_SHIFT	9
 #define BYT_PULL_STR_MASK	(3 << BYT_PULL_STR_SHIFT)
 #define BYT_PULL_STR_2K		(0 << BYT_PULL_STR_SHIFT)
@@ -1579,6 +1582,9 @@ static int byt_irq_type(struct irq_data
 	 */
 	value &= ~(BYT_DIRECT_IRQ_EN | BYT_TRIG_POS | BYT_TRIG_NEG |
 		   BYT_TRIG_LVL);
+	/* Enable glitch filtering */
+	value |= BYT_GLITCH_FILTER_EN | BYT_GLITCH_F_SLOW_CLK |
+		 BYT_GLITCH_F_FAST_CLK;
 
 	writel(value, reg);