linux-kernel - Re: [PATCH v5 38/39] media: imx: csi: fix crop rectangle reset in sink set

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Date:   Tue, 21 Mar 2017 11:27:41 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, 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, shuah@...nel.org,
        sakari.ailus@...ux.intel.com, pavel@....cz,
        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 v5 38/39] media: imx: csi: fix crop rectangle reset in
 sink set_fmt

On Mon, Mar 20, 2017 at 06:23:24PM +0100, Philipp Zabel wrote:
> @@ -1173,15 +1196,8 @@ static void csi_try_fmt(struct csi_priv *priv,
>  		incc = imx_media_find_mbus_format(infmt->code,
>  						  CS_SEL_ANY, true);
>  
> -		if (sdformat->format.width < priv->crop.width * 3 / 4)
> -			sdformat->format.width = priv->crop.width / 2;
> -		else
> -			sdformat->format.width = priv->crop.width;
> -
> -		if (sdformat->format.height < priv->crop.height * 3 / 4)
> -			sdformat->format.height = priv->crop.height / 2;
> -		else
> -			sdformat->format.height = priv->crop.height;
> +		sdformat->format.width = compose->width;
> +		sdformat->format.height = compose->height;
>  
>  		if (incc->bayer) {
>  			sdformat->format.code = infmt->code;

We need to do more in here, because right now setting the source pads
overwrites the colorimetry etc information.  Maybe something like the
below?  I'm wondering if it would be a saner approach to copy the
sink format and update the parameters that can be changed, rather than
trying to list all the parameters that shouldn't be changed.  What if
the format structure gains a new member?

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 1492b92e1970..756204ced53c 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1221,6 +1221,12 @@ static void csi_try_fmt(struct csi_priv *priv,
 			sdformat->format.field =  (infmt->height == 480) ?
 				V4L2_FIELD_SEQ_TB : V4L2_FIELD_SEQ_BT;
 		}
+
+		/* copy settings we can't change */
+		sdformat->format.colorspace = infmt->colorspace;
+		sdformat->format.ycbcr_enc = infmt->ycbcr_enc;
+		sdformat->format.quantization = infmt->quantization;
+		sdformat->format.xfer_func = infmt->xfer_func;
 		break;
 	case CSI_SINK_PAD:
 		v4l_bound_align_image(&sdformat->format.width, MIN_W, MAX_W,



-- 
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