From: Jai Luthra <jai.luthra@xxxxxxxxxxxxxxxx> On the I2C bus for remote clients (sensors), by default the watchdog timer expires in 1s. To allow for a quicker system bring-up time, TI recommends to speed it up to 50us [1]. [1]: Section 7.3.1.1 - https://www.ti.com/lit/gpn/ds90ub953-q1 Signed-off-by: Jai Luthra <jai.luthra@xxxxxxxxxxxxxxxx> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx> --- drivers/media/i2c/ds90ub953.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c index 99a4852b9381..6c36980e8beb 100644 --- a/drivers/media/i2c/ds90ub953.c +++ b/drivers/media/i2c/ds90ub953.c @@ -54,6 +54,10 @@ #define UB953_REG_CLKOUT_CTRL0 0x06 #define UB953_REG_CLKOUT_CTRL1 0x07 +#define UB953_REG_I2C_CONTROL2 0x0a +#define UB953_REG_I2C_CONTROL2_SDA_OUTPUT_SETUP_SHIFT 4 +#define UB953_REG_I2C_CONTROL2_BUS_SPEEDUP BIT(1) + #define UB953_REG_SCL_HIGH_TIME 0x0b #define UB953_REG_SCL_LOW_TIME 0x0c @@ -1320,6 +1324,13 @@ static int ub953_hw_init(struct ub953_data *priv) if (ret) return ret; + v = 0; + v |= 1 << UB953_REG_I2C_CONTROL2_SDA_OUTPUT_SETUP_SHIFT; + v |= UB953_REG_I2C_CONTROL2_BUS_SPEEDUP; + ret = ub953_write(priv, UB953_REG_I2C_CONTROL2, v, NULL); + if (ret) + return ret; + return 0; } -- 2.43.0
