Re: [PATCH 01/19] media: adv748x: Add support for active state

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Hi Laurent

On Thu, May 02, 2024 at 08:34:30PM GMT, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Tue, Apr 30, 2024 at 12:39:37PM +0200, Jacopo Mondi wrote:
> > Initialize and use the subdev active state to store the subdevice
> > format.
> >
> > This simplifies the implementation of the get_fmt and set_fmt pad
> > operations.
> >
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
> > ---
> >  drivers/media/i2c/adv748x/adv748x-csi2.c | 69 ++++--------------------
> >  drivers/media/i2c/adv748x/adv748x.h      |  1 -
> >  2 files changed, 11 insertions(+), 59 deletions(-)
> >
> > diff --git a/drivers/media/i2c/adv748x/adv748x-csi2.c b/drivers/media/i2c/adv748x/adv748x-csi2.c
> > index 5b265b722394..435b0909bbef 100644
> > --- a/drivers/media/i2c/adv748x/adv748x-csi2.c
> > +++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
> > @@ -139,78 +139,26 @@ static const struct v4l2_subdev_video_ops adv748x_csi2_video_ops = {
> >   * But we must support setting the pad formats for format propagation.
> >   */
> >
> > -static struct v4l2_mbus_framefmt *
> > -adv748x_csi2_get_pad_format(struct v4l2_subdev *sd,
> > -			    struct v4l2_subdev_state *sd_state,
> > -			    unsigned int pad, u32 which)
> > -{
> > -	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
> > -
> > -	if (which == V4L2_SUBDEV_FORMAT_TRY)
> > -		return v4l2_subdev_state_get_format(sd_state, pad);
> > -
> > -	return &tx->format;
> > -}
> > -
> > -static int adv748x_csi2_get_format(struct v4l2_subdev *sd,
> > -				   struct v4l2_subdev_state *sd_state,
> > -				   struct v4l2_subdev_format *sdformat)
> > -{
> > -	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
> > -	struct adv748x_state *state = tx->state;
> > -	struct v4l2_mbus_framefmt *mbusformat;
> > -
> > -	mbusformat = adv748x_csi2_get_pad_format(sd, sd_state, sdformat->pad,
> > -						 sdformat->which);
> > -	if (!mbusformat)
> > -		return -EINVAL;
> > -
> > -	mutex_lock(&state->mutex);
> > -
> > -	sdformat->format = *mbusformat;
> > -
> > -	mutex_unlock(&state->mutex);
> > -
> > -	return 0;
> > -}
> > -
> >  static int adv748x_csi2_set_format(struct v4l2_subdev *sd,
> >  				   struct v4l2_subdev_state *sd_state,
> >  				   struct v4l2_subdev_format *sdformat)
> >  {
> > -	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
> > -	struct adv748x_state *state = tx->state;
> >  	struct v4l2_mbus_framefmt *mbusformat;
> > -	int ret = 0;
> > -
> > -	mbusformat = adv748x_csi2_get_pad_format(sd, sd_state, sdformat->pad,
> > -						 sdformat->which);
> > -	if (!mbusformat)
> > -		return -EINVAL;
> >
> > -	mutex_lock(&state->mutex);
> > +	mbusformat = v4l2_subdev_state_get_format(sd_state, sdformat->pad);
> >
> > +	/* Format on the source pad is always copied from the sink one. */
> >  	if (sdformat->pad == ADV748X_CSI2_SOURCE) {
> >  		const struct v4l2_mbus_framefmt *sink_fmt;
> >
> > -		sink_fmt = adv748x_csi2_get_pad_format(sd, sd_state,
> > -						       ADV748X_CSI2_SINK,
> > -						       sdformat->which);
> > -
> > -		if (!sink_fmt) {
> > -			ret = -EINVAL;
> > -			goto unlock;
> > -		}
> > -
> > +		sink_fmt = v4l2_subdev_state_get_format(sd_state,
> > +							ADV748X_CSI2_SINK);
> >  		sdformat->format = *sink_fmt;
>
> That's not the right way to do it. You should propagate the format from
> sink to source when pad == ADV748X_CSI2_SINK, and return
> adv748x_csi2_get_format() when pad == ADV748X_CSI2_SOURCE. Otherwise

I think it's done later and this patch doesn't change the currently
implemented behaviour, doesn't it ?

Anyway, I got that you would prefer to squash the first patches in a
single one, so this will be solved


> setting the format on the sink pad will not update the state of the
> source pad, and a get format call on the source pad will return an
> incorrect format.
>
> >  	}
> >
> >  	*mbusformat = sdformat->format;
> >
> > -unlock:
> > -	mutex_unlock(&state->mutex);
> > -
> > -	return ret;
> > +	return 0;
> >  }
> >
> >  static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
> > @@ -228,7 +176,7 @@ static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad
> >  }
> >
> >  static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = {
> > -	.get_fmt = adv748x_csi2_get_format,
> > +	.get_fmt = v4l2_subdev_get_fmt,
> >  	.set_fmt = adv748x_csi2_set_format,
> >  	.get_mbus_config = adv748x_csi2_get_mbus_config,
> >  };
> > @@ -320,6 +268,11 @@ int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx)
> >  	if (ret)
> >  		goto err_cleanup_subdev;
> >
> > +	tx->sd.state_lock = tx->ctrl_hdl.lock;
>
> Maybe that's addressed in subsequent patches, but do we need a
> device-wide lock ? The code you replace above uses the

device-wide as global to the CSI-2, the HDMI and the AFE subdevices ?

> adv748x_state.mutex lock, which covers all subdevs. I don't think this
> patch introduces race conditions, so this could possibly be handled on
> top.
>
> > +	ret = v4l2_subdev_init_finalize(&tx->sd);
> > +	if (ret)
> > +		goto err_free_ctrl;
> > +
> >  	ret = v4l2_async_register_subdev(&tx->sd);
> >  	if (ret)
> >  		goto err_free_ctrl;
> > diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> > index d2b5e722e997..9bc0121d0eff 100644
> > --- a/drivers/media/i2c/adv748x/adv748x.h
> > +++ b/drivers/media/i2c/adv748x/adv748x.h
> > @@ -75,7 +75,6 @@ enum adv748x_csi2_pads {
> >
> >  struct adv748x_csi2 {
> >  	struct adv748x_state *state;
> > -	struct v4l2_mbus_framefmt format;
> >  	unsigned int page;
> >  	unsigned int port;
> >  	unsigned int num_lanes;
>
> --
> Regards,
>
> Laurent Pinchart




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