[media] V4L: sh_mobile_ceu_camera: maximum image size depends on the hardware version

Newer CEU versions, e.g., the one, used on sh7372, support image sizes
larger than 2560x1920. Retrieve maximum sizes from platform properties.

Signed-off-by: Guennadi Liakhovetski <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/sh_mobile_ceu_camera.c

···
 
 	u32 cflcr;
 
+	/* static max sizes either from platform data or default */
+	int max_width;
+	int max_height;
+
 	enum v4l2_field field;
 	int sequence;
 
···
 		if (ret < 0)
 			return ret;
 
-		while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
+		/*
+		 * All currently existing CEU implementations support 2560x1920
+		 * or larger frames. If the sensor is proposing too big a frame,
+		 * don't bother with possibly supportred by the CEU larger
+		 * sizes, just try VGA multiples. If needed, this can be
+		 * adjusted in the future.
+		 */
+		while ((mf.width > pcdev->max_width ||
+			mf.height > pcdev->max_height) && shift < 4) {
 			/* Try 2560x1920, 1280x960, 640x480, 320x240 */
 			mf.width	= 2560 >> shift;
 			mf.height	= 1920 >> shift;
···
 static int client_s_fmt(struct soc_camera_device *icd,
 			struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
 {
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct sh_mobile_ceu_dev *pcdev = ici->priv;
 	struct sh_mobile_ceu_cam *cam = icd->host_priv;
 	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 	struct device *dev = icd->parent;
···
 	if (ret < 0)
 		return ret;
 
-	max_width = min(cap.bounds.width, 2560);
-	max_height = min(cap.bounds.height, 1920);
+	max_width = min(cap.bounds.width, pcdev->max_width);
+	max_height = min(cap.bounds.height, pcdev->max_height);
 
 	/* Camera set a format, but geometry is not precise, try to improve */
 	tmp_w = mf->width;
···
 	if (ret < 0)
 		return ret;
 
-	if (mf.width > 2560 || mf.height > 1920)
+	if (mf.width > pcdev->max_width || mf.height > pcdev->max_height)
 		return -EINVAL;
 
 	/* 4. Calculate camera scales */
···
 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
 				 struct v4l2_format *f)
 {
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct sh_mobile_ceu_dev *pcdev = ici->priv;
 	const struct soc_camera_format_xlate *xlate;
 	struct v4l2_pix_format *pix = &f->fmt.pix;
 	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
···
 	/* FIXME: calculate using depth and bus width */
 
 	/* CFSZR requires height and width to be 4-pixel aligned */
-	v4l_bound_align_image(&pix->width, 2, 2560, 2,
-			      &pix->height, 4, 1920, 2, 0);
+	v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
+			      &pix->height, 4, pcdev->max_height, 2, 0);
 
 	width = pix->width;
 	height = pix->height;
···
 			 * requested a bigger rectangle, it will not return a
 			 * smaller one.
 			 */
-			mf.width = 2560;
-			mf.height = 1920;
+			mf.width = pcdev->max_width;
+			mf.height = pcdev->max_height;
 			ret = v4l2_device_call_until_err(sd->v4l2_dev,
 					soc_camera_grp_id(icd), video,
 					try_mbus_fmt, &mf);
···
 		dev_err(&pdev->dev, "CEU platform data not set.\n");
 		goto exit_kfree;
 	}
+
+	pcdev->max_width = pcdev->pdata->max_width ? : 2560;
+	pcdev->max_height = pcdev->pdata->max_height ? : 1920;
 
 	base = ioremap_nocache(res->start, resource_size(res));
 	if (!base) {

include/media/sh_mobile_ceu.h

···
 
 struct sh_mobile_ceu_info {
 	unsigned long flags;
+	int max_width;
+	int max_height;
 	struct sh_mobile_ceu_companion *csi2;
 };