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| author | Zhang Ying-22455 <ying.zhang22455@nxp.com> | 2017-04-14 09:03:03 (GMT) |
|---|---|---|
| committer | Xie Xiaobo <xiaobo.xie@nxp.com> | 2017-07-14 10:09:38 (GMT) |
| commit | a2d8a0691bc8b300a4d8de5d7d6065e6dad03d02 (patch) | |
| tree | 269b9e6269c58ffdb77e78848d63059b60e22eec /drivers/i2c | |
| parent | 1db43fbb418820912b41bc2105a6d9ad87438421 (diff) | |
| download | linux-a2d8a0691bc8b300a4d8de5d7d6065e6dad03d02.tar.xz | |
i2c: imx: add workaround for erratum ERR010027
ERR010027: Attempting a start cycle while the bus is busy may
generate a short clock pulse.
Software must ensure that the I2C BUS is idle by checking the
bus busy before switching to master mode and attempting a Start
cycle.
Signed-off-by: Zhang Ying-22455 <ying.zhang22455@nxp.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 47fc1f1..6ac0a7c 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -889,6 +889,14 @@ static int i2c_imx_xfer(struct i2c_adapter *adapter, dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); + /* + * workround for ERR010027: ensure that the I2C BUS is idle + * before switching to master mode and attempting a Start cycle + */ + result = i2c_imx_bus_busy(i2c_imx, 0); + if (result) + goto out; + result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent); if (result < 0) goto out; |