On Thu, 17 Aug 2023 at 17:46, Huangzheng Lai <Huangzheng.Lai@xxxxxxxxxx> wrote:
>
> 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);
Can we move this whole function above its caller?
> +
> 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
>
