1 From 8e7e594b685f3fe44cd4803e3a4634bed897c2f7 Mon Sep 17 00:00:00 2001
2 From: Zhang Ying-22455 <ying.zhang22455@nxp.com>
3 Date: Fri, 14 Apr 2017 17:03:03 +0800
4 Subject: [PATCH] i2c: imx: add workaround for erratum ERR010027
6 ERR010027: Attempting a start cycle while the bus is busy may
7 generate a short clock pulse.
9 Software must ensure that the I2C BUS is idle by checking the
10 bus busy before switching to master mode and attempting a Start
13 Signed-off-by: Zhang Ying-22455 <ying.zhang22455@nxp.com>
15 drivers/i2c/busses/i2c-imx.c | 8 ++++++++
16 1 file changed, 8 insertions(+)
18 --- a/drivers/i2c/busses/i2c-imx.c
19 +++ b/drivers/i2c/busses/i2c-imx.c
20 @@ -940,6 +940,14 @@ static int i2c_imx_xfer(struct i2c_adapt
21 enable_runtime_pm = true;
25 + * workround for ERR010027: ensure that the I2C BUS is idle
26 + * before switching to master mode and attempting a Start cycle
28 + result = i2c_imx_bus_busy(i2c_imx, 0);
32 result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);