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: 310c18a414
("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>
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@ -212,6 +212,7 @@ static irqreturn_t riic_tend_isr(int irq, void *data)
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if (readb(riic->base + RIIC_ICSR2) & ICSR2_NACKF) {
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/* We got a NACKIE */
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readb(riic->base + RIIC_ICDRR); /* dummy read */
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riic_clear_set_bit(riic, ICSR2_NACKF, 0, RIIC_ICSR2);
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riic->err = -ENXIO;
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} else if (riic->bytes_left) {
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return IRQ_NONE;
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