From: Zhang Ying-22455 <ying.zhang22455@xxxxxxx> 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@xxxxxxx> --- 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 c406700..2ab24bd 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -890,6 +890,14 @@ 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; -- 1.7.1
