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media: ov772x: handle nested s_power() calls

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Depending on the v4l2 driver, calling s_power() could be nested.  So the
actual transitions between power saving mode and normal operation mode
should only happen at the first power on and the last power off.

This adds an s_power() nesting counter and updates the power state if the
counter is modified from 0 to != 0 or from != 0 to 0.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Akinobu Mita 2018-05-06 10:19:24 -04:00 committed by Mauro Carvalho Chehab
parent c2cae89517
commit 34af7d920b
1 changed files with 30 additions and 4 deletions
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34
drivers/media/i2c/ov772x.c
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@ -424,6 +424,9 @@ struct ov772x_priv {
/* band_filter = COM8[5] ? 256 - BDBASE : 0 */
unsigned short band_filter;
unsigned int fps;
/* lock to protect power_count */
struct mutex lock;
int power_count;
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_pad pad;
#endif
@ -871,9 +874,26 @@ static int ov772x_power_off(struct ov772x_priv *priv)
static int ov772x_s_power(struct v4l2_subdev *sd, int on)
{
struct ov772x_priv *priv = to_ov772x(sd);
int ret = 0;
return on ? ov772x_power_on(priv) :
ov772x_power_off(priv);
mutex_lock(&priv->lock);
/* If the power count is modified from 0 to != 0 or from != 0 to 0,
* update the power state.
*/
if (priv->power_count == !on)
ret = on ? ov772x_power_on(priv) : ov772x_power_off(priv);
if (!ret) {
/* Update the power count. */
priv->power_count += on ? 1 : -1;
WARN(priv->power_count < 0, "Unbalanced power count\n");
WARN(priv->power_count > 1, "Duplicated s_power call\n");
}
mutex_unlock(&priv->lock);
return ret;
}
static const struct ov772x_win_size *ov772x_select_win(u32 width, u32 height)
@ -1303,6 +1323,7 @@ static int ov772x_probe(struct i2c_client *client,
return -ENOMEM;
priv->info = client->dev.platform_data;
mutex_init(&priv->lock);
v4l2_i2c_subdev_init(&priv->subdev, client, &ov772x_subdev_ops);
v4l2_ctrl_handler_init(&priv->hdl, 3);
@ -1313,8 +1334,10 @@ static int ov772x_probe(struct i2c_client *client,
v4l2_ctrl_new_std(&priv->hdl, &ov772x_ctrl_ops,
V4L2_CID_BAND_STOP_FILTER, 0, 256, 1, 0);
priv->subdev.ctrl_handler = &priv->hdl;
if (priv->hdl.error)
return priv->hdl.error;
if (priv->hdl.error) {
ret = priv->hdl.error;
goto error_mutex_destroy;
}
priv->clk = clk_get(&client->dev, NULL);
if (IS_ERR(priv->clk)) {
@ -1362,6 +1385,8 @@ error_clk_put:
clk_put(priv->clk);
error_ctrl_free:
v4l2_ctrl_handler_free(&priv->hdl);
error_mutex_destroy:
mutex_destroy(&priv->lock);
return ret;
}
@ -1376,6 +1401,7 @@ static int ov772x_remove(struct i2c_client *client)
gpiod_put(priv->pwdn_gpio);
v4l2_async_unregister_subdev(&priv->subdev);
v4l2_ctrl_handler_free(&priv->hdl);
mutex_destroy(&priv->lock);
return 0;
}