Patch "pinctrl: baytrail: Enable glitch filter for GPIOs used as interrupts" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-baytrail-enable-glitch-filter-for-gpios-used-as-interrupts.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 1 Jan 2018 13:23:57 +0100
Subject: pinctrl: baytrail: Enable glitch filter for GPIOs used as interrupts

From: Hans de Goede <hdegoede@redhat.com>


[ 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>
---
 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);
 


Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.9/gpio-crystalcove-do-not-write-regular-gpio-registers-for-virtual-gpios.patch
queue-4.9/acpi-video-default-lcd_only-to-true-on-win8-ready-and-newer-machines.patch
queue-4.9/hid-i2c-call-acpi_device_fix_up_power-for-acpi-enumerated-devices.patch
queue-4.9/ata-libahci-properly-propagate-return-value-of-platform_get_irq.patch
queue-4.9/input-goodix-disable-irqs-while-suspended.patch
queue-4.9/asoc-intel-cht_bsw_rt5645-analog-mic-support.patch
queue-4.9/pinctrl-baytrail-enable-glitch-filter-for-gpios-used-as-interrupts.patch