[PATCH 06/11] media: atomisp-ov2680: Save/restore exposure and gain over sensor power-down

[Hans de Goede <hdegoede@xxxxxxxxxx>]

Save/restore exposure and gain over sensor power-down and don't write them
to the sensor when ov2680_set_exposure() is called while the sensor is off.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 .../staging/media/atomisp/i2c/atomisp-ov2680.c    | 15 ++++++++++++++-
 drivers/staging/media/atomisp/i2c/ov2680.h        |  3 +++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
index 83608ba4e70a..5b192218ba91 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
@@ -359,7 +359,14 @@ static int ov2680_set_exposure(struct v4l2_subdev *sd, int exposure,
 	int ret;
 
 	mutex_lock(&dev->input_lock);
-	ret = __ov2680_set_exposure(sd, exposure, gain, digitgain);
+
+	dev->exposure = exposure;
+	dev->gain = gain;
+	dev->digitgain = digitgain;
+
+	if (dev->power_on)
+		ret = __ov2680_set_exposure(sd, exposure, gain, digitgain);
+
 	mutex_unlock(&dev->input_lock);
 
 	return ret;
@@ -748,6 +755,10 @@ static int power_up(struct v4l2_subdev *sd)
 	if (ret)
 		goto fail_init_registers;
 
+	ret = __ov2680_set_exposure(sd, dev->exposure, dev->gain, dev->digitgain);
+	if (ret)
+		goto fail_init_registers;
+
 	dev->power_on = true;
 	return 0;
 
@@ -1140,6 +1151,8 @@ static int ov2680_probe(struct i2c_client *client)
 	mutex_init(&dev->input_lock);
 
 	dev->res = &ov2680_res_preview[0];
+	dev->exposure = dev->res->lines_per_frame - OV2680_INTEGRATION_TIME_MARGIN;
+	dev->gain = 250; /* 0-2047 */
 	v4l2_i2c_subdev_init(&dev->sd, client, &ov2680_ops);
 
 	pdata = gmin_camera_platform_data(&dev->sd,
diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h b/drivers/staging/media/atomisp/i2c/ov2680.h
index c1998c9132a2..ca20ce5aa285 100644
--- a/drivers/staging/media/atomisp/i2c/ov2680.h
+++ b/drivers/staging/media/atomisp/i2c/ov2680.h
@@ -174,6 +174,9 @@ struct ov2680_device {
 	struct ov2680_resolution *res;
 	struct camera_sensor_platform_data *platform_data;
 	bool power_on;
+	u16 exposure;
+	u16 gain;
+	u16 digitgain;
 };
 
 /**
-- 
2.31.1