[media] soc-camera: fix a recent multi-camera breakage on sh-mobile

With the introduction of CSI2 support on sh-mobile, the host driver
switched to using v4l2_device_call_until_err() with grp_id == 0 to
call subdev operations on the sensor and the CSI2 subdev. However,
this has broken multi-client set ups like the one on migor, because
that way all operations get called on both clients. To fix this add
a grp_id and set it to the client private context.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 9 insertions, 6 deletions

diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c
index 3fe54bf41142..134e86bf6d97 100644
--- a/drivers/media/video/sh_mobile_ceu_camera.c
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -922,7 +922,7 @@ static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int
                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
                         mf.width        = 2560 >> shift;
                         mf.height       = 1920 >> shift;
-                        ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
+                        ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
                                                          s_mbus_fmt, &mf);
                         if (ret < 0)
                                 return ret;
@@ -1224,7 +1224,7 @@ static int client_s_fmt(struct soc_camera_device *icd,
         struct v4l2_cropcap cap;
         int ret;
 
-        ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
+        ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
                                          s_mbus_fmt, mf);
         if (ret < 0)
                 return ret;
@@ -1254,7 +1254,7 @@ static int client_s_fmt(struct soc_camera_device *icd,
                 tmp_h = min(2 * tmp_h, max_height);
                 mf->width = tmp_w;
                 mf->height = tmp_h;
-                ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
+                ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
                                                  s_mbus_fmt, mf);
                 dev_geo(dev, "Camera scaled to %ux%u\n",
                         mf->width, mf->height);
@@ -1658,7 +1658,7 @@ static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
         mf.code         = xlate->code;
         mf.colorspace   = pix->colorspace;
 
-        ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video, try_mbus_fmt, &mf);
+        ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
         if (ret < 0)
                 return ret;
 
@@ -1682,7 +1682,7 @@ static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
                          */
                         mf.width = 2560;
                         mf.height = 1920;
-                        ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
+                        ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
                                                          try_mbus_fmt, &mf);
                         if (ret < 0) {
                                 /* Shouldn't actually happen... */
diff --git a/drivers/media/video/sh_mobile_csi2.c b/drivers/media/video/sh_mobile_csi2.c
index dd1b81b1442b..9e7c1a7c46c2 100644
--- a/drivers/media/video/sh_mobile_csi2.c
+++ b/drivers/media/video/sh_mobile_csi2.c
@@ -208,6 +208,7 @@ static int sh_csi2_notify(struct notifier_block *nb,
         case BUS_NOTIFY_BOUND_DRIVER:
                 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
                          dev_name(v4l2_dev->dev), ".mipi-csi");
+                priv->subdev.grp_id = (long)icd;
                 ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
                 dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
                 if (ret < 0)
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 46284489e4eb..921993060d2f 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -1071,6 +1071,9 @@ static int soc_camera_probe(struct device *dev)
                 }
         }
 
+        sd = soc_camera_to_subdev(icd);
+        sd->grp_id = (long)icd;
+
         /* At this point client .probe() should have run already */
         ret = soc_camera_init_user_formats(icd);
         if (ret < 0)
@@ -1092,7 +1095,6 @@ static int soc_camera_probe(struct device *dev)
                 goto evidstart;
 
         /* Try to improve our guess of a reasonable window format */
-        sd = soc_camera_to_subdev(icd);
         if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
                 icd->user_width         = mf.width;
                 icd->user_height        = mf.height;