linux-kernel - [PATCH v6 28/39] media: imx: csi: fix crop rectangle changes in set

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Message-Id: <1490661656-10318-29-git-send-email-steve_longerbeam@mentor.com>
Date:   Mon, 27 Mar 2017 17:40:45 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     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,
        p.zabel@...gutronix.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
Cc:     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: [PATCH v6 28/39] media: imx: csi: fix crop rectangle changes in set_fmt

From: Philipp Zabel <p.zabel@...gutronix.de>

The cropping rectangle was being modified by the output pad's
set_fmt, which is the wrong pad to do this. The crop rectangle
should not be modified by the output pad set_fmt. It instead
should be reset to the full input frame when the input pad format
is set.

The output pad set_fmt should set width/height to the current
crop dimensions, or 1/2 the crop width/height to enable
downscaling.

So the other part of this patch is to enable downscaling if
the output pad dimension(s) are 1/2 the crop dimension(s) at
csi_setup() time.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 35 ++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 37c68d8..730966b 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -555,6 +555,10 @@ static int csi_setup(struct csi_priv *priv)
 
 	ipu_csi_set_window(priv->csi, &priv->crop);
 
+	ipu_csi_set_downsize(priv->csi,
+			     priv->crop.width == 2 * outfmt->width,
+			     priv->crop.height == 2 * outfmt->height);
+
 	ipu_csi_init_interface(priv->csi, &sensor_mbus_cfg, &if_fmt);
 
 	ipu_csi_set_dest(priv->csi, priv->dest);
@@ -945,15 +949,15 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
 	switch (sdformat->pad) {
 	case CSI_SRC_PAD_DIRECT:
 	case CSI_SRC_PAD_IDMAC:
-		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, sensor);
-		if (ret)
-			goto out;
-		sdformat->format.width = crop.width;
-		sdformat->format.height = crop.height;
+		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;
 
 		if (sdformat->pad == CSI_SRC_PAD_IDMAC) {
 			cc = imx_media_find_format(0, sdformat->format.code,
@@ -999,6 +1003,14 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
 		}
 		break;
 	case CSI_SINK_PAD:
+		crop.left = 0;
+		crop.top = 0;
+		crop.width = sdformat->format.width;
+		crop.height = sdformat->format.height;
+		ret = csi_try_crop(priv, &crop, sensor);
+		if (ret)
+			goto out;
+
 		cc = imx_media_find_format(0, sdformat->format.code,
 					   true, false);
 		if (!cc) {
@@ -1017,9 +1029,8 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
 	} else {
 		priv->format_mbus[sdformat->pad] = sdformat->format;
 		priv->cc[sdformat->pad] = cc;
-		/* Update the crop window if this is an output pad  */
-		if (sdformat->pad == CSI_SRC_PAD_DIRECT ||
-		    sdformat->pad == CSI_SRC_PAD_IDMAC)
+		/* Reset the crop window if this is the input pad */
+		if (sdformat->pad == CSI_SINK_PAD)
 			priv->crop = crop;
 	}
 
-- 
2.7.4