linux-kernel - Re: [PATCH v3 17/24] media: imx: Add CSI subdev driver

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Date:   Tue, 31 Jan 2017 16:51:22 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v3 17/24] media: imx: Add CSI subdev driver

On Fri, 2017-01-06 at 18:11 -0800, Steve Longerbeam wrote:
[...]
> +static int csi_set_fmt(struct v4l2_subdev *sd,
> +		       struct v4l2_subdev_pad_config *cfg,
> +		       struct v4l2_subdev_format *sdformat)
> +{
> +	struct csi_priv *priv = v4l2_get_subdevdata(sd);
> +	struct v4l2_mbus_framefmt *infmt, *outfmt;
> +	struct v4l2_rect crop;
> +	int ret;
> +
> +	if (sdformat->pad >= CSI_NUM_PADS)
> +		return -EINVAL;
> +
> +	if (priv->stream_on)
> +		return -EBUSY;
> +
> +	infmt = &priv->format_mbus[priv->input_pad];
> +	outfmt = &priv->format_mbus[priv->output_pad];
> +
> +	if (sdformat->pad == priv->output_pad) {
> +		sdformat->format.code = infmt->code;
> +		sdformat->format.field = infmt->field;
> +		crop.left = priv->crop.left;
> +		crop.top = priv->crop.top;
> +		crop.width = sdformat->format.width;
> +		crop.height = sdformat->format.height;
> +		ret = csi_try_crop(priv, &crop);

This is the wrong way around, see also below.

Here the the output sdformat->format.width/height should be set to the
priv->crop.width/height (or priv->crop.width/height / 2, to enable
downscaling). The crop rectangle should not be changed by an output pad
set_fmt.

> +		if (ret)
> +			return ret;
> +		sdformat->format.width = crop.width;
> +		sdformat->format.height = crop.height;
> +	}
> +
> +	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		cfg->try_fmt = sdformat->format;
> +	} else {
> +		priv->format_mbus[sdformat->pad] = sdformat->format;
> +		/* Update the crop window if this is output pad  */
> +		if (sdformat->pad == priv->output_pad)
> +			priv->crop = crop;

The crop rectangle instead should be reset to the full input frame when
the input pad format is set.

regards
Philipp