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

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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 <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Hans de Goede 2018-01-01 13:23:57 +01:00 • committed by Linus Walleij
commit 9291c65b01
1 changed files with 6 additions and 0 deletions
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6
drivers/pinctrl/intel/pinctrl-baytrail.c
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@ -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);