linux-kernel - Re: [PATCH 1/2] media: ov7670: Add entity pads initialization

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Date:   Tue, 15 Aug 2017 19:23:51 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Wenyou Yang <wenyou.yang@...rochip.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: Re: [PATCH 1/2] media: ov7670: Add entity pads initialization

Hi Wenyou,

On Thu, Aug 10, 2017 at 05:06:44PM +0800, Wenyou Yang wrote:
> Add the media entity pads initialization.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...rochip.com>

The patch itself seems fine. However the driver is lacking support for
get_fmt which I think would be necessary for the user space API to work
properly. Without sub-device nodes it might not have been an issue with
certain master drivers.

Could you add that in v2, in a separate patch before this one, please?

> ---
> 
>  drivers/media/i2c/ov7670.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> index e88549f0e704..5c8460ee65c3 100644
> --- a/drivers/media/i2c/ov7670.c
> +++ b/drivers/media/i2c/ov7670.c
> @@ -213,6 +213,7 @@ struct ov7670_devtype {
>  struct ov7670_format_struct;  /* coming later */
>  struct ov7670_info {
>  	struct v4l2_subdev sd;
> +	struct media_pad pad;
>  	struct v4l2_ctrl_handler hdl;
>  	struct {
>  		/* gain cluster */
> @@ -1688,14 +1689,23 @@ static int ov7670_probe(struct i2c_client *client,
>  	v4l2_ctrl_auto_cluster(2, &info->auto_exposure,
>  			       V4L2_EXPOSURE_MANUAL, false);
>  	v4l2_ctrl_cluster(2, &info->saturation);
> +
> +	info->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	info->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&info->sd.entity, 1, &info->pad);
> +	if (ret < 0)
> +		goto hdl_free;
> +
>  	v4l2_ctrl_handler_setup(&info->hdl);
>  
>  	ret = v4l2_async_register_subdev(&info->sd);
>  	if (ret < 0)
> -		goto hdl_free;
> +		goto entity_cleanup;
>  
>  	return 0;
>  
> +entity_cleanup:
> +	media_entity_cleanup(&info->sd.entity);
>  hdl_free:
>  	v4l2_ctrl_handler_free(&info->hdl);
>  clk_disable:
> @@ -1712,6 +1722,7 @@ static int ov7670_remove(struct i2c_client *client)
>  	v4l2_device_unregister_subdev(sd);
>  	v4l2_ctrl_handler_free(&info->hdl);
>  	clk_disable_unprepare(info->clk);
> +	media_entity_cleanup(&info->sd.entity);
>  	return 0;
>  }
>  
> -- 
> 2.13.0
> 

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi