I2C: OMAP: NACK without STP
authorJan Weitzel <j.weitzel@phytec.de>
Wed, 7 Dec 2011 19:50:16 +0000 (11:50 -0800)
committerBen Dooks <ben-linux@fluff.org>
Tue, 17 Jan 2012 22:44:54 +0000 (22:44 +0000)
commit78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f
tree789fb9325b72a6ee86c474b7f98dc3767661cd45
parent2727b1753934e154931d6b3bdf20c9b2398457a2
I2C: OMAP: NACK without STP

On OMAP4 OMAP_I2C_STAT_NACK is causing a timeout on the next access.
The isr cleans all flags in OMAP_I2C_CON_REG by setting OMAP_I2C_CON_STP
OMAP_I2C_CON_STP is also set in omap_i2c_xfer_msg on the last message.

According to the TI TSR the sequence for OMAP_I2C_STAT_NACK and
OMAP_I2C_STAT_AL are nearly the same.
Removing the OMAP_I2C_CON_STP part in the isr fix the problem.
Tested on OMAP4430 and OMAP3530 (here NACK was not a problem)
Fixes also booting on 2430sdp.

Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
drivers/i2c/busses/i2c-omap.c