diff options
| author | Jan Weitzel <j.weitzel@phytec.de> | 2011-06-15 22:25:11 +0100 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2011-06-15 22:25:11 +0100 |
| commit | 17d7560574b3d4c267a036b3ad0ff93f0acbeb02 (patch) | |
| tree | 2365314f0a7c7df25e6dd970f488d08fe97dc8c3 | |
| parent | 4b3f6b58f83e0a0208f7a0245521f0c09b8ed762 (diff) | |
ARM: OMAP2+ i2c 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>
| -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 b8c4e9948be..86e8f881685 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -850,11 +850,9 @@ 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; |