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The rockchip IQ tool sends data via usb uvc. The data buf of v4l2_event is used for IQ tool userspace on uvc device side to receive vendor specific data from host, the max length of data maybe 4096 bytes, so increase the data length of v4l2_event to 4100. I have already tested the usb host uvc function, it works well with this patch. Note: The userspace need to update the data length of v4l2_event to 4100 synchronously. Change-Id: I1a4673d50137760e190a17c6981740952fac2ca7 Signed-off-by: William Wu <william.wu@rock-chips.com>