apm821xx: fix bogus key-presses on boot

[openwrt/openwrt.git] / target / linux / apm821xx / patches-4.14 / 100-powerpc-4xx-uic-clear-pending-interrupt-after-irq-ty.patch

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 (file)
index 0000000..ee4eeb6
--- /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 <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);
+