pinctrl: baytrail: Enable glitch filter for GPIOs used as interrupts

[ 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@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
index 0a965026b134242f1f6de16af1aac8d8d64af403..fc5b18d3db20eff75041cb4351009fbd0eacd17c 100644 (file)
--- 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 *d, unsigned int type)
         */
        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);