diff options
| author | Jai Luthra <jai.luthra@ideasonboard.com> | 2025-03-03 21:32:11 +0530 |
|---|---|---|
| committer | Hans Verkuil <hverkuil@xs4all.nl> | 2025-04-25 10:15:06 +0200 |
| commit | dbad194b0bffbacd896ed9dec7fd3556720b8049 (patch) | |
| tree | 4f076abe1216f2a00b89704206d9829d62c0a1b8 | |
| parent | d3be2fcde66d38c5f229c0f74cf3616f3453179e (diff) | |
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 <jai.luthra@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
| -rw-r--r-- | drivers/media/i2c/ds90ub953.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c index a08aad3f7fe0..a5c23e94f4ea 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) |