uvc: support the query of iommu_enabled

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index b2dc32623a71f239e2ab914acba6d99b84708bc8..196198fe873f5929a4e8aa861a771088d54de750 100644 (file)
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -28,7 +28,7 @@
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-ioctl.h>
-
+#include <linux/of.h>
 #include "uvcvideo.h"
 
 /* ------------------------------------------------------------------------
@@ -558,6 +558,8 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
        case VIDIOC_QUERYCAP:
        {
                struct v4l2_capability *cap = arg;
+               struct device_node *vpu_node;
+               int vpu_iommu_enabled = 0;
 
                memset(cap, 0, sizeof *cap);
                strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
@@ -573,6 +575,13 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                else
                        cap->device_caps = V4L2_CAP_VIDEO_OUTPUT
                                         | V4L2_CAP_STREAMING;
+        vpu_node = of_find_node_by_name(NULL, "vpu_service");
+       if(vpu_node){
+               ret = of_property_read_u32(vpu_node, "iommu_enabled", &vpu_iommu_enabled);
+       }else{
+               printk("get vpu_node failed,vpu_iommu_enabled == 0 !!!!!!\n");
+       }
+        cap->reserved[0] = vpu_iommu_enabled;
                break;
        }