If we use usb gadget as uvc and adb composite function,
the adb will be disconnected if the uvc camera apk is
closed. I can reproduce this issue by the following steps
on rk3399/rk3288 platforms.
1. Set usb gadget as uvc and adb composite function,
and open uvc camera apk on rk3399/rk3288 platforms.
2. Connect usb to PC, and use adb shell;
3. Close the uvc camera apk;
And then, the adb will also be disconnected. It's because
that when close the uvc camera apk, the userspace calls
v4l2_release -> uvc_v4l2_release -> uvc_function_disconnect
-> usb_gadget_deactivate -> usb_gadget_disconnect ->
pullup(gadget, 0), this cause usb controller disconnect the
usb connection.
This patch adds a uvc_enabled flag to indicate that usb
is connected, don't call pullup(gadget, 0) to disconnet
usb if we only close uvc camera apk but not plug out usb
cable.
Change-Id: I0cc5ce8a24e8e06e0dc9215dfd1b92ef702e4311
Signed-off-by: William Wu <william.wu@rock-chips.com>
3099e13bdb