From: Ying Zhang <b40530@xxxxxxxxxxxxx> ERR010027/ERR008951: 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: Ying Zhang <b40530@xxxxxxxxxxxxx> --- drivers/i2c/busses/i2c-imx.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index a2b132c..f1fe599 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -889,6 +889,13 @@ 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 fail0; + result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent); if (result < 0) goto out; -- 2.1.0.27.g96db324 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
