Commit 030f9f68 authored by Lubomir Rintel's avatar Lubomir Rintel Committed by Mauro Carvalho Chehab
Browse files

media: ov7670: control clock along with power 



This provides more power saving when the sensor is off.

While at that, do the delay on power/clock enable even if the sensor driver
itself doesn't control the GPIOs. This is required for the OLPC XO-1
platform, that lacks the proper power/reset properties in its DT, but
needs the delay after the sensor is clocked up.

Signed-off-by: default avatarLubomir Rintel <lkundrak@v3.sk>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 3d6a8fe2

drivers/media/i2c/ov7670.c

+14 −16
Original line number Diff line number Diff line
@@ -1625,14 +1625,17 @@ static void ov7670_power_on(struct v4l2_subdev *sd) 
	if (info->on)

		return;



	clk_prepare_enable(info->clk);



	if (info->pwdn_gpio)

		gpiod_set_value(info->pwdn_gpio, 0);

	if (info->resetb_gpio) {

		gpiod_set_value(info->resetb_gpio, 1);

		usleep_range(500, 1000);

		gpiod_set_value(info->resetb_gpio, 0);

		usleep_range(3000, 5000);

	}

	if (info->pwdn_gpio || info->resetb_gpio || info->clk)

		usleep_range(3000, 5000);



	info->on = true;

}
@@ -1644,6 +1647,8 @@ static void ov7670_power_off(struct v4l2_subdev *sd) 
	if (!info->on)

		return;



	clk_disable_unprepare(info->clk);



	if (info->pwdn_gpio)

		gpiod_set_value(info->pwdn_gpio, 1);
@@ -1864,24 +1869,20 @@ static int ov7670_probe(struct i2c_client *client, 
			return ret;

	}



	if (info->clk) {

		ret = clk_prepare_enable(info->clk);

	ret = ov7670_init_gpio(client, info);

	if (ret)

		return ret;



	ov7670_power_on(sd);



	if (info->clk) {

		info->clock_speed = clk_get_rate(info->clk) / 1000000;

		if (info->clock_speed < 10 || info->clock_speed > 48) {

			ret = -EINVAL;

			goto clk_disable;

			goto power_off;

		}

	}



	ret = ov7670_init_gpio(client, info);

	if (ret)

		goto clk_disable;



	ov7670_power_on(sd);



	/* Make sure it's an ov7670 */

	ret = ov7670_detect(sd);

	if (ret) {
@@ -1961,6 +1962,7 @@ static int ov7670_probe(struct i2c_client *client, 
	if (ret < 0)

		goto entity_cleanup;



	ov7670_power_off(sd);

	return 0;



entity_cleanup:
@@ -1969,12 +1971,9 @@ hdl_free: 
	v4l2_ctrl_handler_free(&info->hdl);

power_off:

	ov7670_power_off(sd);

clk_disable:

	clk_disable_unprepare(info->clk);

	return ret;

}





static int ov7670_remove(struct i2c_client *client)

{

	struct v4l2_subdev *sd = i2c_get_clientdata(client);
@@ -1982,7 +1981,6 @@ static int ov7670_remove(struct i2c_client *client) 


	v4l2_async_unregister_subdev(sd);

	v4l2_ctrl_handler_free(&info->hdl);

	clk_disable_unprepare(info->clk);

	media_entity_cleanup(&info->sd.entity);

	ov7670_power_off(sd);

	return 0;

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