tree ded8f74768206aa607449249d188ba0275976e72
parent f32bb2aad27e5dac434a8fa1e12b1d6c25fe49f8
author Alexander Monakov <amonakov@ispras.ru> 1524923766 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1527001077 +0200

i2c: designware: fix poll-after-enable regression

commit 06cb616b1bca7080824acfedb3d4c898e7a64836 upstream.

Not all revisions of DW I2C controller implement the enable status register.
On platforms where that's the case (e.g. BG2CD and SPEAr ARM SoCs), waiting
for enable will time out as reading the unimplemented register yields zero.

It was observed that reading the IC_ENABLE_STATUS register once suffices to
avoid getting it stuck on Bay Trail hardware, so replace polling with one
dummy read of the register.

Fixes: fba4adbbf670 ("i2c: designware: must wait for enable")
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Tested-by: Ben Gardner <gardner.ben@gmail.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>