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apm821xx: fix bogus key-presses on boot 

"There are often transient line events when
the system is powered up and initialized and it
is often necessary for the gpio_chip driver to
clear any interrupt flags in hardware before
setting up the gpio chip, especially the
irqchip portions of it."
<http://lists.infradead.org/pipermail/openwrt-devel/2019-June/017630.html>

This patch adds a fix for the APM821XX's interrupt
controller to clear any bogus pending toggled
interrupts that happens on various APM821XX boards
on boot.

The patch also changes the debouce-interval from the
default 5ms debounce interval to 60ms all around.
The default setting caused on occasions that the button
state became stuck in a pressed state, even though the
button was released.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
openwrt-19.07
Christian Lamparter 2019-06-15 19:13:30 +02:00
parent 43b8e5b120
commit dbe5730bf9
5 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
target/linux/apm821xx/dts/meraki-mr24.dts
View File

@ -175,6 +175,7 @@
interrupt-parent = <&UIC1>;
interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>;
gpios = <&GPIO0 16 GPIO_ACTIVE_LOW>;
debounce-interval = <60>;
};
};
};

1
target/linux/apm821xx/dts/meraki-mx60.dts
View File

@ -167,6 +167,7 @@
gpios = <&GPIO0 16 GPIO_ACTIVE_LOW>;
interrupt-parent = <&UIC1>;
interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
};
};

1
target/linux/apm821xx/dts/netgear-wndap6x0.dtsi
View File

@ -131,6 +131,7 @@
linux,code = <KEY_RESTART>;
interrupt-parent = <&UIC1>;
interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
};

4
target/linux/apm821xx/dts/netgear-wndr4700.dts
View File

@ -317,6 +317,7 @@
linux,code = <KEY_RESTART>;
interrupt-parent = <&UIC1>;
interrupts = <0x14 IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
backup_hd {
@ -325,6 +326,7 @@
linux,code = <BTN_0>;
interrupt-parent = <&UIC1>;
interrupts = <0x1e IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
rfkill {
@ -333,6 +335,7 @@
linux,code = <KEY_RFKILL>;
interrupt-parent = <&UIC1>;
interrupts = <0x1f IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
wps {
@ -341,6 +344,7 @@
linux,code = <KEY_WPS_BUTTON>;
interrupt-parent = <&UIC2>;
interrupts = <0x19 IRQ_TYPE_EDGE_FALLING>;
debounce-interval = <60>;
};
};

30
target/linux/apm821xx/patches-4.14/100-powerpc-4xx-uic-clear-pending-interrupt-after-irq-ty.patch Normal file
View File

@ -0,0 +1,30 @@
From 9b84ad676e248a3e3c81db7f5d39e1739b3780aa Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@gmail.com>
Date: Sat, 15 Jun 2019 16:35:26 +0200
Subject: [PATCH] powerpc/4xx/uic: clear pending interrupt after irq type/pol
change
When testing out gpio-keys with a button, a spurious
interrupt (and therefore a key press or release event)
gets triggered as soon as the driver enables the irq
line for the first time.
This patch clears any potential bogus generated interrupt
that was caused by the switching of the associated irq's
type and polarity.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---
arch/powerpc/platforms/4xx/uic.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/powerpc/platforms/4xx/uic.c
+++ b/arch/powerpc/platforms/4xx/uic.c
@@ -158,6 +158,7 @@ static int uic_set_irq_type(struct irq_d
mtdcr(uic->dcrbase + UIC_PR, pr);
mtdcr(uic->dcrbase + UIC_TR, tr);
+ mtdcr(uic->dcrbase + UIC_SR, ~mask);
raw_spin_unlock_irqrestore(&uic->lock, flags);