linux-kernel - [PATCH 3/3] mfd: twl6040: Clear the interrupt ID register before requesting IRQ

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Date:	Thu, 27 Feb 2014 15:56:50 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	<florian.vaussard@...l.ch>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 3/3] mfd: twl6040: Clear the interrupt ID register before requesting IRQ

If for some reason the boot loader enabled the audpwron GPIO we will have
pending IRQs to be handled. This seams to break twl6040 for some reason
leading to non working i2c communication (i2c timeouts). Clearing the INTID
register after we requested the audpwron GPIO (and set it to low) will
ensure that the chip will operate normally in this case as well.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/mfd/twl6040.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
index 693d547db1de..ea8acfb029df 100644
--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -688,6 +688,9 @@ static int twl6040_probe(struct i2c_client *client,
 					    GPIOF_OUT_INIT_LOW, "audpwron");
 		if (ret)
 			goto gpio_err;
+
+		/* Clear any pending interrupt */
+		twl6040_reg_read(twl6040, TWL6040_REG_INTID);
 	}
 
 	ret = regmap_add_irq_chip(twl6040->regmap, twl6040->irq, IRQF_ONESHOT,
-- 
1.9.0

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