diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/808-i2c-0007-i2c-imx-add-workaround-for-erratum-ERR010027.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/808-i2c-0007-i2c-imx-add-workaround-for-erratum-ERR010027.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/808-i2c-0007-i2c-imx-add-workaround-for-erratum-ERR010027.patch b/target/linux/layerscape/patches-5.4/808-i2c-0007-i2c-imx-add-workaround-for-erratum-ERR010027.patch new file mode 100644 index 0000000000..68b08fba31 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/808-i2c-0007-i2c-imx-add-workaround-for-erratum-ERR010027.patch @@ -0,0 +1,34 @@ +From 8e7e594b685f3fe44cd4803e3a4634bed897c2f7 Mon Sep 17 00:00:00 2001 +From: Zhang Ying-22455 <ying.zhang22455@nxp.com> +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 <ying.zhang22455@nxp.com> +--- + 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; |