linux-kernel - [PATCH 19/22] input/ti_am335x_tsc: ACK the HW

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Message-Id: <1370950268-7224-20-git-send-email-bigeasy@linutronix.de>
Date:	Tue, 11 Jun 2013 13:31:05 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	Benoît Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-input@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 19/22] input/ti_am335x_tsc: ACK the HW_PEN irq in ISR

The interrupt source IRQENB_HW_PEN is enabled in suspend and suposed to
be used as a wake up source. Once this interrupt source is unmaksed, the
devices ends up in ISR and never continues.
This change ACKs the interrupt and disables it so the system does not
freeze.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 29febe9..84859da 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -308,6 +308,12 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		irqclr |= IRQENB_PENUP;
 	}
 
+	if (status & IRQENB_HW_PEN) {
+
+		titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00);
+		titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
+	}
+
 	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
 
 	am335x_tsc_se_update(ts_dev->mfd_tscadc);
-- 
1.7.10.4

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