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    Subject[PATCH V2 7/7] i2c: sprd: Add I2C_NACK_EN and I2C_TRANS_EN control bits
    Date
    The new I2C IP version on the UNISOC platform has added I2C_NACK_EN and
    I2C_TRANS_EN control bits. To ensure that the I2C controller can initiate
    transmission smoothly, these two bits need to be configured.

    Signed-off-by: Huangzheng Lai <Huangzheng.Lai@unisoc.com>
    ---
    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 dbdac89ad482..431c0db84d22 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
    @@ -366,7 +368,7 @@ 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 int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
    --
    2.17.1
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