From: Christian Lamparter Date: Sat, 15 Jun 2019 17:13:30 +0000 (+0200) Subject: apm821xx: fix bogus key-presses on boot X-Git-Tag: v19.07.0-rc1~427 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=dbe5730bf956903f64975a3baf746c93d4f36e10;p=oweals%2Fopenwrt.git 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." 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 --- diff --git a/target/linux/apm821xx/dts/meraki-mr24.dts b/target/linux/apm821xx/dts/meraki-mr24.dts index 144c6f0eb3..8fdef7c171 100644 --- a/target/linux/apm821xx/dts/meraki-mr24.dts +++ b/target/linux/apm821xx/dts/meraki-mr24.dts @@ -175,6 +175,7 @@ interrupt-parent = <&UIC1>; interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>; gpios = <&GPIO0 16 GPIO_ACTIVE_LOW>; + debounce-interval = <60>; }; }; }; diff --git a/target/linux/apm821xx/dts/meraki-mx60.dts b/target/linux/apm821xx/dts/meraki-mx60.dts index 2550d259ab..3620005e4d 100644 --- a/target/linux/apm821xx/dts/meraki-mx60.dts +++ b/target/linux/apm821xx/dts/meraki-mx60.dts @@ -167,6 +167,7 @@ gpios = <&GPIO0 16 GPIO_ACTIVE_LOW>; interrupt-parent = <&UIC1>; interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; }; }; diff --git a/target/linux/apm821xx/dts/netgear-wndap6x0.dtsi b/target/linux/apm821xx/dts/netgear-wndap6x0.dtsi index c39f4ad83b..2d135d64da 100644 --- a/target/linux/apm821xx/dts/netgear-wndap6x0.dtsi +++ b/target/linux/apm821xx/dts/netgear-wndap6x0.dtsi @@ -131,6 +131,7 @@ linux,code = ; interrupt-parent = <&UIC1>; interrupts = <0x15 IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; }; diff --git a/target/linux/apm821xx/dts/netgear-wndr4700.dts b/target/linux/apm821xx/dts/netgear-wndr4700.dts index 24d5c33f90..a9ec36adad 100644 --- a/target/linux/apm821xx/dts/netgear-wndr4700.dts +++ b/target/linux/apm821xx/dts/netgear-wndr4700.dts @@ -317,6 +317,7 @@ linux,code = ; interrupt-parent = <&UIC1>; interrupts = <0x14 IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; backup_hd { @@ -325,6 +326,7 @@ linux,code = ; interrupt-parent = <&UIC1>; interrupts = <0x1e IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; rfkill { @@ -333,6 +335,7 @@ linux,code = ; interrupt-parent = <&UIC1>; interrupts = <0x1f IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; wps { @@ -341,6 +344,7 @@ linux,code = ; interrupt-parent = <&UIC2>; interrupts = <0x19 IRQ_TYPE_EDGE_FALLING>; + debounce-interval = <60>; }; }; diff --git a/target/linux/apm821xx/patches-4.14/100-powerpc-4xx-uic-clear-pending-interrupt-after-irq-ty.patch b/target/linux/apm821xx/patches-4.14/100-powerpc-4xx-uic-clear-pending-interrupt-after-irq-ty.patch new file mode 100644 index 0000000000..ee4eeb6963 --- /dev/null +++ b/target/linux/apm821xx/patches-4.14/100-powerpc-4xx-uic-clear-pending-interrupt-after-irq-ty.patch @@ -0,0 +1,30 @@ +From 9b84ad676e248a3e3c81db7f5d39e1739b3780aa Mon Sep 17 00:00:00 2001 +From: Christian Lamparter +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 +--- + 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); +