[PATCH v3 1/2] media: i2c: imx412: fix sensor power-on timing

[Wenmeng Liu]

Assert the reset GPIO at the start of power-on, enable regulators and the
clock, then deassert reset. This avoids a mismatch where the first
power-up (when the reset GPIO defaults deasserted) differs from subsequent
cycles.

Signed-off-by: Wenmeng Liu <wenmeng.liu@xxxxxxxxxxxxxxxx>
---
 drivers/media/i2c/imx412.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/imx412.c b/drivers/media/i2c/imx412.c
index b3826f80354703b17b416dc233854da3f5736e38..ebc2fb706442365f541540bf4ce9d307d42e0061 100644
--- a/drivers/media/i2c/imx412.c
+++ b/drivers/media/i2c/imx412.c
@@ -1022,6 +1022,8 @@ static int imx412_power_on(struct device *dev)
 	struct imx412 *imx412 = to_imx412(sd);
 	int ret;
 
+	gpiod_set_value_cansleep(imx412->reset_gpio, 1);
+
 	ret = regulator_bulk_enable(ARRAY_SIZE(imx412_supply_names),
 				    imx412->supplies);
 	if (ret < 0) {
@@ -1029,20 +1031,19 @@ static int imx412_power_on(struct device *dev)
 		return ret;
 	}
 
-	gpiod_set_value_cansleep(imx412->reset_gpio, 0);
-
 	ret = clk_prepare_enable(imx412->inclk);
 	if (ret) {
 		dev_err(imx412->dev, "fail to enable inclk\n");
 		goto error_reset;
 	}
 
+	gpiod_set_value_cansleep(imx412->reset_gpio, 0);
+
 	usleep_range(1000, 1200);
 
 	return 0;
 
 error_reset:
-	gpiod_set_value_cansleep(imx412->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(imx412_supply_names),
 			       imx412->supplies);
 

-- 
2.34.1