You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.0 KiB
Diff
35 lines
1.0 KiB
Diff
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;
|