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| author | Jan Weitzel <j.weitzel@phytec.de> | 2011-12-07 11:50:16 -0800 |
|---|---|---|
| committer | Ziyann <jaraidaniel@gmail.com> | 2014-10-01 12:57:43 +0200 |
| commit | b104285d3efdef8346ae85881d103fe03d4c0fab (patch) | |
| tree | e3d1973afd0bf805618ff7564642a7fdc27f055d /drivers/i2c | |
| parent | d787a2c1804c554a57aa7bb721f9c8db0ebf3588 (diff) | |
| download | kernel_samsung_tuna-b104285d3efdef8346ae85881d103fe03d4c0fab.tar.gz kernel_samsung_tuna-b104285d3efdef8346ae85881d103fe03d4c0fab.tar.bz2 kernel_samsung_tuna-b104285d3efdef8346ae85881d103fe03d4c0fab.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.
[Picked from http://patches.linaro.org/1899/]
Change-Id: I9bdeba8853ced27659770ad9390bd1b4be573155
Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Diffstat (limited to 'drivers/i2c')
| -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 0088b8cddd1..125013778f6 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -894,11 +894,9 @@ 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; |