tree 62a574f766e3cc1ec73b2a9522dfe20ab90320a2
parent a4ded68dddba421f33f9e483892fb3c0a3834196
author Chris Brandt <chris.brandt@renesas.com> 1569500349 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1570271436 +0200

i2c: riic: Clear NACK in tend isr

commit a71e2ac1f32097fbb2beab098687a7a95c84543e upstream.

The NACKF flag should be cleared in INTRIICNAKI interrupt processing as
description in HW manual.

This issue shows up quickly when PREEMPT_RT is applied and a device is
probed that is not plugged in (like a touchscreen controller). The result
is endless interrupts that halt system boot.

Fixes: 310c18a41450 ("i2c: riic: add driver")
Cc: stable@vger.kernel.org
Reported-by: Chien Nguyen <chien.nguyen.eb@rvc.renesas.com>
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>