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Message-Id: <20191003154416.575317081@linuxfoundation.org>
Date: Thu, 3 Oct 2019 17:54:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Chien Nguyen <chien.nguyen.eb@....renesas.com>,
Chris Brandt <chris.brandt@...esas.com>,
Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH 4.9 125/129] i2c: riic: Clear NACK in tend isr
From: Chris Brandt <chris.brandt@...esas.com>
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@...r.kernel.org
Reported-by: Chien Nguyen <chien.nguyen.eb@....renesas.com>
Signed-off-by: Chris Brandt <chris.brandt@...esas.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/i2c/busses/i2c-riic.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -212,6 +212,7 @@ static irqreturn_t riic_tend_isr(int irq
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;
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