Re: [PATCH 07/19] media: i2c: ov4689: Use sub-device active state

Laurent Pinchart
2023-12-11T18:15:20Z

Hi Mikhail,

Thank you for the patch.

On Mon, Dec 11, 2023 at 08:50:10PM +0300, Mikhail Rudenko wrote:
> Use sub-device active state. Employ control handler lock to
> synchronize access to the active state and s_stream.
>
> Signed-off-by: Mikhail Rudenko <mike.rudenko@gmail.com>
> ---
> drivers/media/i2c/ov4689.c | 68 +++++++++++++++-----------------------
> 1 file changed, 27 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
> index 5392f650960c..2eef64cd0070 100644
> --- a/drivers/media/i2c/ov4689.c
> +++ b/drivers/media/i2c/ov4689.c
> @@ -86,7 +86,6 @@ struct ov4689 {
>
> u32 clock_rate;
>
> - struct mutex mutex; /* lock to protect ctrls and cur_mode */
> struct v4l2_ctrl_handler ctrl_handler;
> struct v4l2_ctrl *exposure;
>
> @@ -319,19 +318,6 @@ static int ov4689_set_fmt(struct v4l2_subdev *sd,
> return 0;
> }
>
> -static int ov4689_get_fmt(struct v4l2_subdev *sd,
> - struct v4l2_subdev_state *sd_state,
> - struct v4l2_subdev_format *fmt)
> -{
> - struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> - struct ov4689 *ov4689 = to_ov4689(sd);
> -
> - /* only one mode supported for now */
> - ov4689_fill_fmt(ov4689->cur_mode, mbus_fmt);
> -
> - return 0;
> -}
> -
> static int ov4689_enum_mbus_code(struct v4l2_subdev *sd,
> struct v4l2_subdev_state *sd_state,
> struct v4l2_subdev_mbus_code_enum *code)
> @@ -405,10 +391,11 @@ static int ov4689_get_selection(struct v4l2_subdev *sd,
> static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
> {
> struct ov4689 *ov4689 = to_ov4689(sd);
> + struct v4l2_subdev_state *sd_state;
> struct device *dev = ov4689->dev;
> int ret = 0;
>
> - mutex_lock(&ov4689->mutex);
> + sd_state = v4l2_subdev_lock_and_get_active_state(&ov4689->subdev);
>
> if (on) {
> ret = pm_runtime_resume_and_get(dev);
> @@ -443,7 +430,7 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
> }
>
> unlock_and_return:
> - mutex_unlock(&ov4689->mutex);
> + v4l2_subdev_unlock_state(sd_state);
>
> return ret;
> }
> @@ -506,19 +493,15 @@ static int __maybe_unused ov4689_power_off(struct device *dev)
> return 0;
> }
>
> -static int ov4689_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +static int ov4689_init_cfg(struct v4l2_subdev *sd,
> + struct v4l2_subdev_state *sd_state)
> {
> - struct ov4689 *ov4689 = to_ov4689(sd);
> - struct v4l2_mbus_framefmt *try_fmt;
> -
> - mutex_lock(&ov4689->mutex);
> + struct v4l2_mbus_framefmt *try_fmt =
> + v4l2_subdev_state_get_format(sd_state, 0);
>
> - try_fmt = v4l2_subdev_state_get_format(fh->state, 0);
> /* Initialize try_fmt */

It's not necessarily a "try format" anymore, so you cand rop this
comment, and rename the variable from try_fmt to fmt.

> ov4689_fill_fmt(&supported_modes[OV4689_MODE_2688_1520], try_fmt);
>
> - mutex_unlock(&ov4689->mutex);
> -
> return 0;
> }
>
> @@ -526,18 +509,15 @@ static const struct dev_pm_ops ov4689_pm_ops = {
> SET_RUNTIME_PM_OPS(ov4689_power_off, ov4689_power_on, NULL)
> };
>
> -static const struct v4l2_subdev_internal_ops ov4689_internal_ops = {
> - .open = ov4689_open,
> -};
> -
> static const struct v4l2_subdev_video_ops ov4689_video_ops = {
> .s_stream = ov4689_s_stream,
> };
>
> static const struct v4l2_subdev_pad_ops ov4689_pad_ops = {
> + .init_cfg = ov4689_init_cfg,

Please rebase on top of the latest media tree for the next version, the
.init_cfg() operation has been renamed to .init_state() and moved to
v4l2_subdev_internal_ops.

Other than that, this patch looks good.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> .enum_mbus_code = ov4689_enum_mbus_code,
> .enum_frame_size = ov4689_enum_frame_sizes,
> - .get_fmt = ov4689_get_fmt,
> + .get_fmt = v4l2_subdev_get_fmt,
> .set_fmt = ov4689_set_fmt,
> .get_selection = ov4689_get_selection,
> };
> @@ -649,7 +629,6 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
> ret = v4l2_ctrl_handler_init(handler, 10);
> if (ret)
> return ret;
> - handler->lock = &ov4689->mutex;
>
> ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ, 0, 0,
> link_freq_menu_items);
> @@ -862,13 +841,14 @@ static int ov4689_probe(struct i2c_client *client)
> return dev_err_probe(dev, ret,
> "Failed to get power regulators\n");
>
> - mutex_init(&ov4689->mutex);
> -
> sd = &ov4689->subdev;
> v4l2_i2c_subdev_init(sd, client, &ov4689_subdev_ops);
> +
> ret = ov4689_initialize_controls(ov4689);
> - if (ret)
> - goto err_destroy_mutex;
> + if (ret) {
> + dev_err(dev, "Failed to initialize controls\n");
> + return ret;
> + }
>
> ret = ov4689_power_on(dev);
> if (ret)
> @@ -878,19 +858,26 @@ static int ov4689_probe(struct i2c_client *client)
> if (ret)
> goto err_power_off;
>
> - sd->internal_ops = &ov4689_internal_ops;
> sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
>
> ov4689->pad.flags = MEDIA_PAD_FL_SOURCE;
> - sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> ret = media_entity_pads_init(&sd->entity, 1, &ov4689->pad);
> if (ret < 0)
> goto err_power_off;
>
> + sd->state_lock = ov4689->ctrl_handler.lock;
> + ret = v4l2_subdev_init_finalize(sd);
> +
> + if (ret) {
> + dev_err(dev, "Could not register v4l2 device\n");
> + goto err_clean_entity;
> + }
> +
> ret = v4l2_async_register_subdev_sensor(sd);
> if (ret) {
> dev_err(dev, "v4l2 async register subdev failed\n");
> - goto err_clean_entity;
> + goto err_clean_subdev;
> }
>
> pm_runtime_set_active(dev);
> @@ -899,14 +886,14 @@ static int ov4689_probe(struct i2c_client *client)
>
> return 0;
>
> +err_clean_subdev:
> + v4l2_subdev_cleanup(sd);
> err_clean_entity:
> media_entity_cleanup(&sd->entity);
> err_power_off:
> ov4689_power_off(dev);
> err_free_handler:
> v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
> -err_destroy_mutex:
> - mutex_destroy(&ov4689->mutex);
>
> return ret;
> }
> @@ -918,9 +905,8 @@ static void ov4689_remove(struct i2c_client *client)
>
> v4l2_async_unregister_subdev(sd);
> media_entity_cleanup(&sd->entity);
> -
> + v4l2_subdev_cleanup(sd);
> v4l2_ctrl_handler_free(&ov4689->ctrl_handler);
> - mutex_destroy(&ov4689->mutex);
>
> pm_runtime_disable(&client->dev);
> if (!pm_runtime_status_suspended(&client->dev))

--
Regards,

Laurent Pinchart