大家好，
目前使用BSP为yocto L4.1.15-2.1.0，芯片为imx6solo。
目前在使用OTG功能验证时，OTG做device连接PC是没有问题的，但是做host连接U盘时，串口不断的重复打印以下信息，从log来看，是识别了又断开了，不知道是什么问题，请大家帮忙，谢谢。
1.OTG什么都不接的时候，测量ID pin默认被硬件拉高。
2.OTG连接U盘，测量到ID pin上的电阻，一边为低电平，另一边为高电平。
3.OTG设备树配置如下：
reg_usb_otg_vbus: regulator@2 {
compatible = "regulator-fixed";
reg = <2>;
regulator-name = "usb_otg_vbus";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
gpio = <&gpio4 15 0>;
enable-active-high;
};
&usbotg {
vbus-supply = <®_usb_otg_vbus>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usbotg>;
disable-over-current;
dr_mode = "otg";
status = "okay";
};
pinctrl_usbotg: usbotggrp {
fsl,pins = <
MX6QDL_PAD_ENET_RX_ER__USB_OTG_ID 0x17059
MX6QDL_PAD_KEY_ROW4__GPIO4_IO15 0x000b0
MX6QDL_PAD_KEY_COL4__USB_OTG_OC 0x1b0b0
>;
};
4.串口打印的log如下：
[ 16.472251] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 16.477287] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 2
[ 16.503505] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[ 16.519682] hub 2-0:1.0: USB hub found
[ 16.526416] hub 2-0:1.0: 1 port detected
[ 16.853481] usb 2-1: new high-speed USB device number 2 using ci_hdrc
[ 17.014197] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 17.034759] scsi host0: usb-storage 2-1:1.0
[ 17.343434] usb 2-1: USB disconnect, device number 2
[ 17.633467] usb 2-1: new high-speed USB device number 3 using ci_hdrc
[ 17.794203] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 17.813568] scsi host1: usb-storage 2-1:1.0
[ 18.150407] usb 2-1: USB disconnect, device number 3
[ 18.433486] usb 2-1: new high-speed USB device number 4 using ci_hdrc
[ 18.594197] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 18.613572] scsi host2: usb-storage 2-1:1.0
[ 18.958404] usb 2-1: USB disconnect, device number 4
[ 19.243495] usb 2-1: new high-speed USB device number 5 using ci_hdrc
[ 19.404199] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 19.423567] scsi host3: usb-storage 2-1:1.0
[ 19.766400] usb 2-1: USB disconnect, device number 5
[ 20.053460] usb 2-1: new high-speed USB device number 6 using ci_hdrc
[ 20.214189] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 20.233568] scsi host4: usb-storage 2-1:1.0
[ 20.574400] usb 2-1: USB disconnect, device number 6
[ 20.863482] usb 2-1: new high-speed USB device number 7 using ci_hdrc
[ 21.024202] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 21.043618] scsi host5: usb-storage 2-1:1.0
[ 21.382407] usb 2-1: USB disconnect, device number 7
[ 21.673483] usb 2-1: new high-speed USB device number 8 using ci_hdrc
[ 21.834198] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 21.853568] scsi host6: usb-storage 2-1:1.0
[ 22.189413] usb 2-1: USB disconnect, device number 8
[ 22.473483] usb 2-1: new high-speed USB device number 9 using ci_hdrc
[ 22.634200] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 22.653756] scsi host7: usb-storage 2-1:1.0
[ 22.997402] usb 2-1: USB disconnect, device number 9
