From: Jai Luthra Date: Mon, 3 Mar 2025 16:02:11 +0000 (+0530) Subject: media: i2c: ds90ub953: Speed-up I2C watchdog timer X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dbad194b0bffbacd896ed9dec7fd3556720b8049;p=users%2Fdwmw2%2Flinux.git media: i2c: ds90ub953: Speed-up I2C watchdog timer 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 Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c index a08aad3f7fe09..a5c23e94f4eab 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)