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>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 257c1a52c8c..e0733b77607 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -830,11 +830,9 @@ complete:
                                 ~(OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR |
                                 OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
 
-                if (stat & OMAP_I2C_STAT_NACK) {
+                if (stat & OMAP_I2C_STAT_NACK)
                         err |= OMAP_I2C_STAT_NACK;
-                        omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
-                                           OMAP_I2C_CON_STP);
-                }
+
                 if (stat & OMAP_I2C_STAT_AL) {
                         dev_err(dev->dev, "Arbitration lost\n");
                         err |= OMAP_I2C_STAT_AL;