linux-kernel - Re: [PATCH 14/22] media: imx7-mipi-csis: Create media links in bound notifier

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Message-ID: <m3d0gj59bf.fsf@gmail.com>
Date:   Mon, 02 Sep 2019 10:36:20 +0100
From:   Rui Miguel Silva <rmfrfs@...il.com>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     linux-media@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list\:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "moderated list\:ARM\/FREESCALE IMX \/ MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/22] media: imx7-mipi-csis: Create media links in bound notifier

Hi Steve,
Just to let you know that this series no longer apply clean after
your other series:
media: imx: Fix subdev unregister/register issues

And since you will need to send a new one, some notes...

On Tue 06 Aug 2019 at 00:34, Steve Longerbeam wrote:
> Implement a notifier bound op to register media links from the remote
> sub-device's source pad(s) to the mipi csi-2 receiver sink pad.
>
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 25 ++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index f71d9183cad2..e03b2317a1ac 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -259,6 +259,12 @@ struct csi_state {
>  	bool sink_linked;
>  };
>
> +static inline struct csi_state *
> +notifier_to_csis_state(struct v4l2_async_notifier *n)
>

instead of adding this between structs declaration can you move it
down near the similar converter:

static struct csi_state *mipi_sd_to_csis_state(struct v4l2_subdev *sdev)

and remove the inline since the compiler should do this and add
namespacing function name like the other functions, something like:

static struct csi_state * mipi_notifier_to_csis_state(struct v4l2_async_notifier *n)

Just to coherency.

Other than this, looks good to me.

Cheers,
   Rui

> +{
> +	return container_of(n, struct csi_state, notifier);
> +}
> +
>  struct csis_pix_format {
>  	unsigned int pix_width_alignment;
>  	u32 code;
> @@ -863,6 +869,23 @@ static int mipi_csis_parse_endpoint(struct device *dev,
>  	return 0;
>  }
>
> +static int mipi_csis_notify_bound(struct v4l2_async_notifier *notifier,
> +				  struct v4l2_subdev *sd,
> +				  struct v4l2_async_subdev *asd)
> +{
> +	struct csi_state *state = notifier_to_csis_state(notifier);
> +	struct media_pad *sink = &state->mipi_sd.entity.pads[CSIS_PAD_SINK];
> +
> +	return media_create_fwnode_pad_links(sink,
> +					     dev_fwnode(state->mipi_sd.dev),
> +					     &sd->entity,
> +					     dev_fwnode(sd->dev), 0);
> +}
> +
> +static const struct v4l2_async_notifier_operations mipi_csis_notify_ops = {
> +	.bound = mipi_csis_notify_bound,
> +};
> +
>  static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,
>  				 struct platform_device *pdev,
>  				 const struct v4l2_subdev_ops *ops)
> @@ -895,6 +918,8 @@ static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd,
>
>  	v4l2_async_notifier_init(&state->notifier);
>
> +	state->notifier.ops = &mipi_csis_notify_ops;
> +
>  	ret = v4l2_async_register_fwnode_subdev(mipi_sd, &state->notifier,
>  						sizeof(struct v4l2_async_subdev),
>  						&sink_port, 1,