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@ideasonboard.com --- Changes from v2: - Use unsigned value for left shifting - Re-introduce temp variable v that was dropped as it makes it easier to read IMHO - Remove redundancies like initializing v = 0 and if (ret) return ret at the end of the function --- drivers/media/i2c/ds90ub953.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c index a08aad3f7fe09f7b396da9c720ed9993d392410c..a5c23e94f4eab5896a2114cfdf2e5f68cde77568 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
@@ -1320,7 +1324,12 @@ static int ub953_hw_init(struct ub953_data *priv) if (ret) return ret;
- return 0; + v = 1U << 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); + + return ret; }
static int ub953_subdev_init(struct ub953_data *priv)