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Commit 5bab3a0a authored by Christian Lamparter's avatar Christian Lamparter Committed by Greg Kroah-Hartman
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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: default avatarChristian Lamparter <chunkeey@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 20756b70

arch/powerpc/sysdev/uic.c

+1 −0
Original line number Diff line number Diff line
@@ -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);