From a7aa29f0b52bdb07a261442d7c52e6daba2d8488 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sat, 15 Jun 2019 17:23:13 +0200 Subject: [PATCH] powerpc/4xx/uic: clear pending interrupt after irq type/pol change [ Upstream commit 3ab3a0689e74e6aa5b41360bc18861040ddef5b1 ] 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 Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/sysdev/uic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/sysdev/uic.c b/arch/powerpc/sysdev/uic.c index a00949f3e378..a8ebc96dfed2 100644 --- a/arch/powerpc/sysdev/uic.c +++ b/arch/powerpc/sysdev/uic.c @@ -158,6 +158,7 @@ static int uic_set_irq_type(struct irq_data *d, unsigned int flow_type) 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);