[media] V4L: sh_mobile_csi2: verify client compatibility

Switch the meaning of the .lanes platform data parameter to specify
the number of used lanes instead of a bitmask. Verify bus configuration
compatibility with client's capabilities.

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

diff --git a/drivers/media/video/sh_mobile_csi2.c b/drivers/media/video/sh_mobile_csi2.c
index 2893a01..09ef63d 100644 (file)
--- a/drivers/media/video/sh_mobile_csi2.c
+++ b/drivers/media/video/sh_mobile_csi2.c
@@ -19,6 +19,7 @@
 #include <media/sh_mobile_ceu.h>
 #include <media/sh_mobile_csi2.h>
 #include <media/soc_camera.h>
+#include <media/soc_mediabus.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-device.h>
@@ -144,11 +145,21 @@ static void sh_csi2_hwinit(struct sh_csi2 *priv)
        udelay(5);
        iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
 
-       if (priv->client->lanes & 3)
-               tmp |= priv->client->lanes & 3;
-       else
-               /* Default - both lanes */
-               tmp |= 3;
+       switch (pdata->type) {
+       case SH_CSI2C:
+               if (priv->client->lanes == 1)
+                       tmp |= 1;
+               else
+                       /* Default - both lanes */
+                       tmp |= 3;
+               break;
+       case SH_CSI2I:
+               if (!priv->client->lanes || priv->client->lanes > 4)
+                       /* Default - all 4 lanes */
+                       tmp |= 0xf;
+               else
+                       tmp |= (1 << priv->client->lanes) - 1;
+       }
 
        if (priv->client->phy == SH_CSI2_PHY_MAIN)
                tmp |= 0x8000;
@@ -185,7 +196,9 @@ static int sh_csi2_client_connect(struct sh_csi2 *priv)
        struct v4l2_subdev *sd, *csi2_sd = &priv->subdev;
        struct soc_camera_device *icd = NULL;
        struct device *dev = v4l2_get_subdevdata(&priv->subdev);
-       int i;
+       struct v4l2_mbus_config cfg;
+       unsigned long common_flags, csi2_flags;
+       int i, ret;
 
        v4l2_device_for_each_subdev(sd, csi2_sd->v4l2_dev)
                if (sd->grp_id) {
@@ -205,6 +218,39 @@ static int sh_csi2_client_connect(struct sh_csi2 *priv)
        if (i == pdata->num_clients)
                return -ENODEV;
 
+       /* Check if we can support this camera */
+       csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK | V4L2_MBUS_CSI2_1_LANE;
+
+       switch (pdata->type) {
+       case SH_CSI2C:
+               if (pdata->clients[i].lanes != 1)
+                       csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
+               break;
+       case SH_CSI2I:
+               switch (pdata->clients[i].lanes) {
+               default:
+                       csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
+               case 3:
+                       csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
+               case 2:
+                       csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
+               }
+       }
+
+       cfg.type = V4L2_MBUS_CSI2;
+       ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+       if (ret == -ENOIOCTLCMD)
+               common_flags = csi2_flags;
+       else if (!ret)
+               common_flags = soc_mbus_config_compatible(&cfg,
+                                                         csi2_flags);
+       else
+               common_flags = 0;
+
+       if (!common_flags)
+               return -EINVAL;
+
+       /* All good: camera MIPI configuration supported */
        priv->client = pdata->clients + i;
 
        priv->set_bus_param             = icd->ops->set_bus_param;