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| author | Jan Weitzel | 2011-12-07 20:50:16 +0100 |
|---|---|---|
| committer | Ben Dooks | 2012-01-17 23:44:54 +0100 |
| commit | 78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f (patch) | |
| tree | 789fb9325b72a6ee86c474b7f98dc3767661cd45 /drivers/i2c/busses | |
| parent | I2C: OMAP: correct SYSC register offset for OMAP4 (diff) | |
| download | kernel-qcow2-linux-78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f.tar.gz kernel-qcow2-linux-78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f.tar.xz kernel-qcow2-linux-78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f.zip | |
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>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-omap.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 257c1a52c8c4..e0733b776079 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; |