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i2c: designware: always clear interrupts before enabling them 

If the I2C bus is put to a low power state by an ACPI method it might pull
the SDA line low (as its power is removed). Once the bus is put to full
power state again, the SDA line is pulled back to high. This transition
looks like a STOP condition from the controller point-of-view which sets
STOP detected bit in its status register causing the driver to fail
subsequent transfers.

Fix this by always clearing all interrupts before we start a transfer.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
This commit is contained in:
Mika Westerberg 2013-05-13 00:54:30 +00:00 committed by Wolfram Sang
parent e6f34cea56
commit 2a2d95e9d6
1 changed files with 2 additions and 1 deletions
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3
drivers/i2c/busses/i2c-designware-core.c
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@ -383,7 +383,8 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
/* Enable the adapter */
__i2c_dw_enable(dev, true);
/* Enable interrupts */
/* Clear and enable interrupts */
i2c_dw_clear_int(dev);
dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
}