Hi Akinobu,
thanks for the patch
On Sun, May 06, 2018 at 11:19:28PM +0900, Akinobu Mita wrote:
> The ov772x driver is going to offer a V4L2 sub-device interface, so
> changing the output data format and the frame interval on this sub-device
> can be made anytime. However, these requests are preferred to fail while
> the video stream on the device is active.
>
> Cc: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
Thanks
j
> ---
> * v5:
> - Make s_frame_interval() return -EBUSY while streaming
>
> drivers/media/i2c/ov772x.c | 43 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 33 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c
> index 262a7e5..4b479f9 100644
> --- a/drivers/media/i2c/ov772x.c
> +++ b/drivers/media/i2c/ov772x.c
> @@ -424,9 +424,10 @@ struct ov772x_priv {
> /* band_filter = COM8[5] ? 256 - BDBASE : 0 */
> struct v4l2_ctrl *band_filter_ctrl;
> unsigned int fps;
> - /* lock to protect power_count */
> + /* lock to protect power_count and streaming */
> struct mutex lock;
> int power_count;
> + int streaming;
> #ifdef CONFIG_MEDIA_CONTROLLER
> struct media_pad pad;
> #endif
> @@ -603,18 +604,28 @@ static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
> {
> struct i2c_client *client = v4l2_get_subdevdata(sd);
> struct ov772x_priv *priv = to_ov772x(sd);
> + int ret = 0;
>
> - if (!enable) {
> - ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE, SOFT_SLEEP_MODE);
> - return 0;
> - }
> + mutex_lock(&priv->lock);
>
> - ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE, 0);
> + if (priv->streaming == enable)
> + goto done;
>
> - dev_dbg(&client->dev, "format %d, win %s\n",
> - priv->cfmt->code, priv->win->name);
> + ret = ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE,
> + enable ? 0 : SOFT_SLEEP_MODE);
> + if (ret)
> + goto done;
>
> - return 0;
> + if (enable) {
> + dev_dbg(&client->dev, "format %d, win %s\n",
> + priv->cfmt->code, priv->win->name);
> + }
> + priv->streaming = enable;
> +
> +done:
> + mutex_unlock(&priv->lock);
> +
> + return ret;
> }
>
> static unsigned int ov772x_select_fps(struct ov772x_priv *priv,
> @@ -743,9 +754,15 @@ static int ov772x_s_frame_interval(struct v4l2_subdev *sd,
> unsigned int fps;
> int ret = 0;
>
> + mutex_lock(&priv->lock);
> +
> + if (priv->streaming) {
> + ret = -EBUSY;
> + goto error;
> + }
> +
> fps = ov772x_select_fps(priv, tpf);
>
> - mutex_lock(&priv->lock);
> /*
> * If the device is not powered up by the host driver do
> * not apply any changes to H/W at this time. Instead
> @@ -1222,6 +1239,12 @@ static int ov772x_set_fmt(struct v4l2_subdev *sd,
> }
>
> mutex_lock(&priv->lock);
> +
> + if (priv->streaming) {
> + ret = -EBUSY;
> + goto error;
> + }
> +
> /*
> * If the device is not powered up by the host driver do
> * not apply any changes to H/W at this time. Instead
> --
> 2.7.4
>
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