When a timeout exception occurs in the IIC driver, the IIC controller
will be reset, and after resetting, control bits such as I2C_EN and
I2C_INT_EN will be reset to 0, and the IIC master cannot initiate
Transmission unless sprd_i2c_enable() is executed. To address this issue,
this patch places sprd_i2c_enable() before each transmission initiation
to ensure that the necessary control bits of the IIC controller are
configured.
Signed-off-by: Huangzheng Lai <Huangzheng.Lai@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-sprd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index 02c11a9ff2da..7314c897525d 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -310,6 +310,8 @@ static int sprd_i2c_handle_msg(struct i2c_adapter *i2c_adap,
return i2c_dev->err;
}
+static void sprd_i2c_enable(struct sprd_i2c *i2c_dev);
+
static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num)
{
@@ -320,6 +322,8 @@ static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
if (ret < 0)
return ret;
+ sprd_i2c_enable(i2c_dev);
+
for (im = 0; im < num - 1; im++) {
ret = sprd_i2c_handle_msg(i2c_adap, &msgs[im], 0);
if (ret)
@@ -661,8 +665,6 @@ static int __maybe_unused sprd_i2c_runtime_resume(struct device *dev)
if (ret)
return ret;
- sprd_i2c_enable(i2c_dev);
-
return 0;
}
--
2.17.1
