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Commit 75aaa6f6 authored by Chris Brandt's avatar Chris Brandt Committed by Greg Kroah-Hartman
Browse files

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: 310c18a4 ("i2c: riic: add driver")
Cc: stable@vger.kernel.org
Reported-by: default avatarChien Nguyen <chien.nguyen.eb@rvc.renesas.com>
Signed-off-by: default avatarChris Brandt <chris.brandt@renesas.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a4ded68d

drivers/i2c/busses/i2c-riic.c

+1 −0
Original line number Diff line number Diff line
@@ -212,6 +212,7 @@ static irqreturn_t riic_tend_isr(int irq, void *data) 
	if (readb(riic->base + RIIC_ICSR2) & ICSR2_NACKF) {

		/* We got a NACKIE */

		readb(riic->base + RIIC_ICDRR);	/* dummy read */

		riic_clear_set_bit(riic, ICSR2_NACKF, 0, RIIC_ICSR2);

		riic->err = -ENXIO;

	} else if (riic->bytes_left) {

		return IRQ_NONE;