From 8e7e594b685f3fe44cd4803e3a4634bed897c2f7 Mon Sep 17 00:00:00 2001 From: Zhang Ying-22455 Date: Fri, 14 Apr 2017 17:03:03 +0800 Subject: [PATCH] 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 --- drivers/i2c/busses/i2c-imx.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -940,6 +940,14 @@ static int i2c_imx_xfer(struct i2c_adapt enable_runtime_pm = true; } + /* + * 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;