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

Mikhail Rudenko
2023-12-12T12:31:37Z

On 2023-12-11 at 20:15 +02, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote:

> 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.

Ack, will rename it in v2.

>
>> 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.

Thanks for the tip, will do it in v2.

> 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))

--
Best regards,
Mikhail Rudenko