On Tue, Jun 03, 2014 at 11:00:32AM +0200, Valentin Longchamp wrote: > The mpc_i2c_fixup function is called when the bus is not released by a > slave. The function generates 9 pulses that should lead the slave > to release the bus. > > The sequence that generates the pulses disables/enables the I2C module > that controls the blocked bus. We have found out on the P2041 SoC that > this could cause the CPU to hang (for a short delay). > > To avoid this, this patch introduces a read to the I2CDR register > between the re-enablement of the I2C module in master mode and its > returning to the slave mode instead of the delay (the final delay, > between the pulses is kept), as proposed in procedure from the P2041 > reference manual (16.6.2.3), and the other manuals from the mpc83xx and > mpc85xx families. > > Signed-off-by: Rainer Boschung <rainer.boschung@xxxxxxxxxxx> > Signed-off-by: Valentin Longchamp <valentin.longchamp@xxxxxxxxxxx> > Applied to for-next, thanks!
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