On Thu, 17 Aug 2023 at 17:46, Huangzheng Lai <Huangzheng.Lai@unisoc.com> wrote:
>
> The new IIC IP version on the UNISOC platform has added I2C_NACK_EN and
> I2C_TRANS_EN control bits. To ensure that the IIC controller can initiate
> transmission smoothly, these two bits need to be configured.
>
> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@unisoc.com>
I would suggest changing the subject to "i2c: sprd: Add I2C_NACK_EN
and I2C_TRANS_EN control bits".
> ---
> drivers/i2c/busses/i2c-sprd.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
> index 7314c897525d..d867389c7f17 100644
> --- a/drivers/i2c/busses/i2c-sprd.c
> +++ b/drivers/i2c/busses/i2c-sprd.c
> @@ -33,6 +33,8 @@
> #define ADDR_RST 0x2c
>
> /* I2C_CTL */
> +#define I2C_NACK_EN BIT(22)
> +#define I2C_TRANS_EN BIT(21)
> #define STP_EN BIT(20)
> #define FIFO_AF_LVL_MASK GENMASK(19, 16)
> #define FIFO_AF_LVL 16
> @@ -397,7 +399,7 @@ static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)
> sprd_i2c_clear_irq(i2c_dev);
>
> tmp = readl(i2c_dev->base + I2C_CTL);
> - writel(tmp | I2C_EN | I2C_INT_EN, i2c_dev->base + I2C_CTL);
> + writel(tmp | I2C_EN | I2C_INT_EN | I2C_NACK_EN | I2C_TRANS_EN, i2c_dev->base + I2C_CTL);
> }
>
> static irqreturn_t sprd_i2c_isr_thread(int irq, void *dev_id)
> --
> 2.17.1
>