media: i2c: imx412: Fix reset GPIO polarity

The imx412/imx577 sensor has a reset line that is active low not active
high. Currently the logic for this is inverted.

The right way to define the reset line is to declare it active low in the
DTS and invert the logic currently contained in the driver.

The DTS should represent the hardware does i.e. reset is active low.
So:
+               reset-gpios = <&tlmm 78 GPIO_ACTIVE_LOW>;
not:
-               reset-gpios = <&tlmm 78 GPIO_ACTIVE_HIGH>;

I was a bit reticent about changing this logic since I thought it might
negatively impact @intel.com users. Googling a bit though I believe this
sensor is used on "Keem Bay" which is clearly a DTS based system and is not
upstream yet.

Fixes: 9214e86c0cc1 ("media: i2c: Add imx412 camera sensor driver")
Cc: stable@vger.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/i2c/imx412.c b/drivers/media/i2c/imx412.c
index be3f6ea55559736030b5fc4615f0dfec2fc539c6..e6be6b4250f5ae8d4bb661c66259868a890e785a 100644 (file)
--- a/drivers/media/i2c/imx412.c
+++ b/drivers/media/i2c/imx412.c
@@ -1011,7 +1011,7 @@ static int imx412_power_on(struct device *dev)
        struct imx412 *imx412 = to_imx412(sd);
        int ret;
 
-       gpiod_set_value_cansleep(imx412->reset_gpio, 1);
+       gpiod_set_value_cansleep(imx412->reset_gpio, 0);
 
        ret = clk_prepare_enable(imx412->inclk);
        if (ret) {
@@ -1024,7 +1024,7 @@ static int imx412_power_on(struct device *dev)
        return 0;
 
 error_reset:
-       gpiod_set_value_cansleep(imx412->reset_gpio, 0);
+       gpiod_set_value_cansleep(imx412->reset_gpio, 1);
 
        return ret;
 }
@@ -1040,7 +1040,7 @@ static int imx412_power_off(struct device *dev)
        struct v4l2_subdev *sd = dev_get_drvdata(dev);
        struct imx412 *imx412 = to_imx412(sd);
 
-       gpiod_set_value_cansleep(imx412->reset_gpio, 0);
+       gpiod_set_value_cansleep(imx412->reset_gpio, 1);
 
        clk_disable_unprepare(imx412->inclk);