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[07/19] media: i2c: ds90ub953: Speed-up I2C watchdog timer

Message ID 20250110-ub9xx-improvements-v1-7-e0b9a1f644da@ideasonboard.com (mailing list archive)
State New
Headers show
Series media: i2c: ds90ub9xx: Error handling, UB9702 improvements | expand

Commit Message

Tomi Valkeinen Jan. 10, 2025, 9:14 a.m. UTC 
From: Jai Luthra <jai.luthra@ideasonboard.com>

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: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/i2c/ds90ub953.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

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;
 }