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uvc: support the query of iommu_enabled

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This commit is contained in:
dalon.zhang
2015-07-17 15:12:06 +08:00
parent ff8dfccbb0
commit 809bc041c8
1 changed files with 10 additions and 1 deletions
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11
drivers/media/usb/uvc/uvc_v4l2.c
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@@ -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;
}