[PATCH RFC 1/5] media: imx219: Move LP-11 state switch to power_on()

[Mattijs Korpershoek <mkorpershoek@kernel.org>]

During probe(), we write the IMX219_MODE_STREAMING register to
transition from streaming -> standby to force LP-11 state.

This should be done at each power-up of the sensor, but is only
done *once* for the driver lifecycle (at probe).

Move the LP-11 sequence to power_on() to ensure that it's always put
into standby mode whenever the pm framework detects it's a power up.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
---
 drivers/media/i2c/imx219.c | 44 ++++++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index 9571f3622d2d..7978fee5f4a2 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -1056,8 +1056,32 @@ static int imx219_power_on(struct device *dev)
 	usleep_range(IMX219_XCLR_MIN_DELAY_US,
 		     IMX219_XCLR_MIN_DELAY_US + IMX219_XCLR_DELAY_RANGE_US);
 
+	/*
+	 * Sensor doesn't enter LP-11 state upon power up until and unless
+	 * streaming is started, so upon power up switch the modes to:
+	 * streaming -> standby
+	 */
+	ret = cci_write(imx219->regmap, IMX219_REG_MODE_SELECT,
+			IMX219_MODE_STREAMING, NULL);
+	if (ret < 0)
+		goto gpio_off;
+
+	usleep_range(100, 110);
+
+	/* put sensor back to standby mode */
+	ret = cci_write(imx219->regmap, IMX219_REG_MODE_SELECT,
+			IMX219_MODE_STANDBY, NULL);
+	if (ret < 0)
+		goto gpio_off;
+
+	usleep_range(100, 110);
+
 	return 0;
 
+gpio_off:
+	gpiod_set_value_cansleep(imx219->reset_gpio, 0);
+	clk_disable_unprepare(imx219->xclk);
+
 reg_off:
 	regulator_bulk_disable(IMX219_NUM_SUPPLIES, imx219->supplies);
 
@@ -1240,26 +1264,6 @@ static int imx219_probe(struct i2c_client *client)
 	if (ret)
 		goto error_power_off;
 
-	/*
-	 * Sensor doesn't enter LP-11 state upon power up until and unless
-	 * streaming is started, so upon power up switch the modes to:
-	 * streaming -> standby
-	 */
-	ret = cci_write(imx219->regmap, IMX219_REG_MODE_SELECT,
-			IMX219_MODE_STREAMING, NULL);
-	if (ret < 0)
-		goto error_power_off;
-
-	usleep_range(100, 110);
-
-	/* put sensor back to standby mode */
-	ret = cci_write(imx219->regmap, IMX219_REG_MODE_SELECT,
-			IMX219_MODE_STANDBY, NULL);
-	if (ret < 0)
-		goto error_power_off;
-
-	usleep_range(100, 110);
-
 	ret = imx219_init_controls(imx219);
 	if (ret)
 		goto error_power_off;

-- 
2.55.0