Re: [PATCH 1/2] i2c-designware: always clear interrupts beforeenabling them

From: Wolfram Sang
Date: Fri May 17 2013 - 04:30:20 EST

On Mon, May 13, 2013 at 01:54:30PM +0300, Mika Westerberg wrote:
> 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@xxxxxxxxxxxxxxx>

Applied to for-current, thanks! Added stable, too.

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