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@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Apr 9 17:09:24 CEST 2018
From: Hans de Goede <hdegoede@xxxxxxxxxx>
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@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);
Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx 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