Hi Tommaso, Thank you for the patch. On Sun, Nov 26, 2023 at 11:34:01AM +0100, Tommaso Merciai wrote: > Port the ov5640 sensor driver to use the subdev active state. > > After the ov5640 configurations steps call v4l2_subdev_init_finalize > that finalizes the initialization of the subdevice. > From now we use subdevice active state to simplify format handling and > locking > > References: > - https://patchwork.kernel.org/project/linux-media/patch/20230710155203.92366-6-jacopo.mondi@xxxxxxxxxxxxxxxx/ > - https://linuxtv.org/downloads/v4l-dvb-apis/driver-api/v4l2-subdev.html#c.v4l2_subdev_cleanup > > Signed-off-by: Tommaso Merciai <tomm.merciai@xxxxxxxxx> > --- > drivers/media/i2c/ov5640.c | 89 ++++++++++---------------------------- > 1 file changed, 24 insertions(+), 65 deletions(-) > > diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c > index 3f79a3b77044..44a073d3df64 100644 > --- a/drivers/media/i2c/ov5640.c > +++ b/drivers/media/i2c/ov5640.c > @@ -446,9 +446,6 @@ struct ov5640_dev { > struct gpio_desc *pwdn_gpio; > bool upside_down; > > - /* lock to protect all members below */ > - struct mutex lock; > - > struct v4l2_mbus_framefmt fmt; This field should go too. The point of using the subdev active state is to move state information from the device-specific structure to the subdev state. Ideally the pending_fmt_change, current_mode, last_mode, current_fr, frame_interval and pending_mode_change fields should go too. That's more work and it's probably OK if we keep some of those fields for the time being. One low(er) hanging fruit is current_fr and frame_interval, which would be nice to address soon. Removing them completely will require the "[RFC PATCH v1 0/4] media: v4l2-subdev: Improve frame interval handling" patch series ([1]), for which I plan to send a v2 soon. You can submit a v2 of this patch, dropping the fmt field, without waiting for the improved frame interval handling. It should however be fairly to merge the current_fr and frame_interval fields (dropping the ov5640_frame_rate enum as a result), it would be nice to see that as a patch already. [1] https://lore.kernel.org/linux-media/20231024005130.28026-1-laurent.pinchart@xxxxxxxxxxxxxxxx > bool pending_fmt_change; > > @@ -2784,30 +2781,6 @@ static int ov5640_try_frame_interval(struct ov5640_dev *sensor, > return mode ? rate : -EINVAL; > } > > -static int ov5640_get_fmt(struct v4l2_subdev *sd, > - struct v4l2_subdev_state *sd_state, > - struct v4l2_subdev_format *format) > -{ > - struct ov5640_dev *sensor = to_ov5640_dev(sd); > - struct v4l2_mbus_framefmt *fmt; > - > - if (format->pad != 0) > - return -EINVAL; > - > - mutex_lock(&sensor->lock); > - > - if (format->which == V4L2_SUBDEV_FORMAT_TRY) > - fmt = v4l2_subdev_state_get_format(sd_state, format->pad); > - else > - fmt = &sensor->fmt; > - > - format->format = *fmt; > - > - mutex_unlock(&sensor->lock); > - > - return 0; > -} > - > static int ov5640_try_fmt_internal(struct v4l2_subdev *sd, > struct v4l2_mbus_framefmt *fmt, > const struct ov5640_mode_info **new_mode) > @@ -2958,21 +2931,14 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd, > if (format->pad != 0) > return -EINVAL; > > - mutex_lock(&sensor->lock); > - > - if (sensor->streaming) { > - ret = -EBUSY; > - goto out; > - } > + if (sensor->streaming) > + return -EBUSY; > > ret = ov5640_try_fmt_internal(sd, mbus_fmt, &new_mode); > if (ret) > - goto out; > + return ret; > > - if (format->which == V4L2_SUBDEV_FORMAT_TRY) { > - *v4l2_subdev_state_get_format(sd_state, 0) = *mbus_fmt; > - goto out; > - } > + *v4l2_subdev_state_get_format(sd_state, 0) = *mbus_fmt; > > if (new_mode != sensor->current_mode) { > sensor->current_fr = new_mode->def_fps; > @@ -2987,26 +2953,16 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd, > > ov5640_update_pixel_rate(sensor); > > -out: > - mutex_unlock(&sensor->lock); > - return ret; > + return 0; > } > > static int ov5640_get_selection(struct v4l2_subdev *sd, > struct v4l2_subdev_state *sd_state, > struct v4l2_subdev_selection *sel) > { > - struct ov5640_dev *sensor = to_ov5640_dev(sd); > - const struct ov5640_mode_info *mode = sensor->current_mode; > - const struct ov5640_timings *timings; > - > switch (sel->target) { > case V4L2_SEL_TGT_CROP: { > - mutex_lock(&sensor->lock); > - timings = ov5640_timings(sensor, mode); > - sel->r = timings->analog_crop; > - mutex_unlock(&sensor->lock); > - > + sel->r = *v4l2_subdev_state_get_crop(sd_state, 0); > return 0; > } > > @@ -3441,9 +3397,6 @@ static int ov5640_init_controls(struct ov5640_dev *sensor) > > v4l2_ctrl_handler_init(hdl, 32); > > - /* we can use our own mutex for the ctrl lock */ > - hdl->lock = &sensor->lock; > - > /* Clock related controls */ > ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE, > ov5640_pixel_rates[OV5640_NUM_PIXEL_RATES - 1], > @@ -3609,9 +3562,7 @@ static int ov5640_g_frame_interval(struct v4l2_subdev *sd, > { > struct ov5640_dev *sensor = to_ov5640_dev(sd); > > - mutex_lock(&sensor->lock); > fi->interval = sensor->frame_interval; > - mutex_unlock(&sensor->lock); > > return 0; > } > @@ -3620,13 +3571,14 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd, > struct v4l2_subdev_frame_interval *fi) > { > struct ov5640_dev *sensor = to_ov5640_dev(sd); > + struct v4l2_subdev_state *state; > const struct ov5640_mode_info *mode; > int frame_rate, ret = 0; > > if (fi->pad != 0) > return -EINVAL; > > - mutex_lock(&sensor->lock); > + state = v4l2_subdev_lock_and_get_active_state(sd); > > if (sensor->streaming) { > ret = -EBUSY; > @@ -3663,7 +3615,7 @@ static int ov5640_s_frame_interval(struct v4l2_subdev *sd, > ov5640_update_pixel_rate(sensor); > } > out: > - mutex_unlock(&sensor->lock); > + v4l2_subdev_unlock_state(state); > return ret; > } > > @@ -3694,6 +3646,7 @@ static int ov5640_enum_mbus_code(struct v4l2_subdev *sd, > static int ov5640_s_stream(struct v4l2_subdev *sd, int enable) > { > struct ov5640_dev *sensor = to_ov5640_dev(sd); > + struct v4l2_subdev_state *state; > int ret = 0; > > if (enable) { > @@ -3708,7 +3661,7 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable) > } > } > > - mutex_lock(&sensor->lock); > + state = v4l2_subdev_lock_and_get_active_state(sd); > > if (sensor->streaming == !enable) { > if (enable && sensor->pending_mode_change) { > @@ -3734,7 +3687,7 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable) > } > > out: > - mutex_unlock(&sensor->lock); > + v4l2_subdev_unlock_state(state); > > if (!enable || ret) { > pm_runtime_mark_last_busy(&sensor->i2c_client->dev); > @@ -3778,7 +3731,7 @@ static const struct v4l2_subdev_video_ops ov5640_video_ops = { > static const struct v4l2_subdev_pad_ops ov5640_pad_ops = { > .init_cfg = ov5640_init_cfg, > .enum_mbus_code = ov5640_enum_mbus_code, > - .get_fmt = ov5640_get_fmt, > + .get_fmt = v4l2_subdev_get_fmt, > .set_fmt = ov5640_set_fmt, > .get_selection = ov5640_get_selection, > .enum_frame_size = ov5640_enum_frame_size, > @@ -3918,8 +3871,6 @@ static int ov5640_probe(struct i2c_client *client) > if (ret) > goto entity_cleanup; > > - mutex_init(&sensor->lock); > - > ret = ov5640_init_controls(sensor); > if (ret) > goto entity_cleanup; > @@ -3938,9 +3889,16 @@ static int ov5640_probe(struct i2c_client *client) > if (ret) > goto err_pm_runtime; > > + sensor->sd.state_lock = sensor->ctrls.handler.lock; > + ret = v4l2_subdev_init_finalize(&sensor->sd); > + if (ret < 0) { > + dev_err(dev, "subdev init error: %d\n", ret); > + goto err_pm_runtime; > + } > + > ret = v4l2_async_register_subdev_sensor(&sensor->sd); > if (ret) > - goto err_pm_runtime; > + goto subdev_cleanup; > > pm_runtime_set_autosuspend_delay(dev, 1000); > pm_runtime_use_autosuspend(dev); > @@ -3949,6 +3907,8 @@ static int ov5640_probe(struct i2c_client *client) > > return 0; > > +subdev_cleanup: > + v4l2_subdev_cleanup(&sensor->sd); > err_pm_runtime: > pm_runtime_put_noidle(dev); > pm_runtime_disable(dev); > @@ -3957,7 +3917,6 @@ static int ov5640_probe(struct i2c_client *client) > v4l2_ctrl_handler_free(&sensor->ctrls.handler); > entity_cleanup: > media_entity_cleanup(&sensor->sd.entity); > - mutex_destroy(&sensor->lock); > return ret; > } > > @@ -3973,9 +3932,9 @@ static void ov5640_remove(struct i2c_client *client) > pm_runtime_set_suspended(dev); > > v4l2_async_unregister_subdev(&sensor->sd); > + v4l2_subdev_cleanup(sd); > media_entity_cleanup(&sensor->sd.entity); > v4l2_ctrl_handler_free(&sensor->ctrls.handler); > - mutex_destroy(&sensor->lock); > } > > static const struct dev_pm_ops ov5640_pm_ops = { -- Regards, Laurent Pinchart
