最近在做移植RTL8723DU到RK356X的工作，這個過程遇到了一些問題。今天記錄遇到的如標題所述的問題，這個問題是我在將wifi模塊插到USB host上內核識別到但是連接不成功，查看了很多資料，好像挺多都講到電流信號啥的問題，現在記錄一下我遇到的這個問題希望可以幫到更多的人。
將模塊插到USB上，使用dmesg命令查看到的緩存信息：

[ 406.785107] usb 5-1: new high-speed USB device number 2 using xhci-hcd [ 406.908835] usb 5-1: device descriptor read/64, error -71 [ 407.142008] usb 5-1: device descriptor read/64, error -71 [ 407.371775] usb 5-1: new high-speed USB device number 3 using xhci-hcd [ 407.495321] usb 5-1: device descriptor read/64, error -71 [ 407.725472] usb 5-1: device descriptor read/64, error -71 [ 407.832210] usb usb5-port1: attempt power cycle [ 408.235232] usb 5-1: new high-speed USB device number 4 using xhci-hcd [ 408.235581] usb 5-1: Device not responding to setup address. [ 408.442000] usb 5-1: Device not responding to setup address. [ 408.648596] usb 5-1: device not accepting address 4, error -71 [ 408.771923] usb 5-1: new high-speed USB device number 5 using xhci-hcd [ 408.772241] usb 5-1: Device not responding to setup address. [ 408.978858] usb 5-1: Device not responding to setup address. [ 409.185336] usb 5-1: device not accepting address 5, error -71 [ 409.185559] usb usb5-port1: unable to enumerate USB device

首先我試了網上很多的解決方法，大致的方法有：

echo Y > /sys/module/usbcore/parameters/old_scheme_first

或者

echo -1 > /sys/module/usbcore/parameters/autosuspend

我試過這些方法最后都不行，無奈之下我直接在板子上插上一個hub轉接出來，然后將模塊插到hub上，這個時候內核可以正常識別到RTL8723DU這個模塊。
正常識別后的dmesg顯示的緩存信息：

[ 1862.348148] usb 5-1: new high-speed USB device number 11 using xhci-hcd [ 1862.365237] usb 5-1: New USB device found, idVendor=1a40, idProduct=0101, bcdDevice= 1.11 [ 1862.365269] usb 5-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [ 1862.365281] usb 5-1: Product: USB 2.0 Hub [ 1862.403229] hub 5-1:1.0: USB hub found [ 1862.403327] hub 5-1:1.0: 4 ports detected [ 1862.784974] usb 5-1.2: new high-speed USB device number 12 using xhci-hcd [ 1862.803946] usb 5-1.2: New USB device found, idVendor=0bda, idProduct=d723, bcdDevice= 2.00 [ 1862.804023] usb 5-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1862.804055] usb 5-1.2: Product: 802.11n WLAN Adapter [ 1862.804084] usb 5-1.2: Manufacturer: Realtek [ 1862.804109] usb 5-1.2: SerialNumber: 00e04c000001 [ 1862.888575] RTW: [ 1862.888575] usb_endpoint_descriptor(0): [ 1862.888660] RTW: bLength=7 [ 1862.888684] RTW: bDescriptorType=5 [ 1862.888705] RTW: bEndpointAddress=84 [ 1862.888725] RTW: wMaxPacketSize=512 [ 1862.888744] RTW: bInterval=0 [ 1862.888764] RTW: RT_usb_endpoint_is_bulk_in = 4 [ 1862.888784] RTW: [ 1862.888784] usb_endpoint_descriptor(1): [ 1862.888807] RTW: bLength=7 [ 1862.888825] RTW: bDescriptorType=5 [ 1862.888876] RTW: bEndpointAddress=5 [ 1862.888901] RTW: wMaxPacketSize=512 [ 1862.888935] RTW: bInterval=0 [ 1862.888975] RTW: RT_usb_endpoint_is_bulk_out = 5 [ 1862.889009] RTW: [ 1862.889009] usb_endpoint_descriptor(2): [ 1862.889046] RTW: bLength=7 [ 1862.889066] RTW: bDescriptorType=5 [ 1862.889085] RTW: bEndpointAddress=6 [ 1862.889104] RTW: wMaxPacketSize=512 [ 1862.889135] RTW: bInterval=0 [ 1862.889172] RTW: RT_usb_endpoint_is_bulk_out = 6 [ 1862.889205] RTW: [ 1862.889205] usb_endpoint_descriptor(3): [ 1862.889241] RTW: bLength=7 [ 1862.889278] RTW: bDescriptorType=5 [ 1862.889311] RTW: bEndpointAddress=87 [ 1862.889344] RTW: wMaxPacketSize=64 [ 1862.889364] RTW: bInterval=3 [ 1862.889383] RTW: RT_usb_endpoint_is_int_in = 7, Interval = 3 [ 1862.889419] RTW: [ 1862.889419] usb_endpoint_descriptor(4): [ 1862.889455] RTW: bLength=7 [ 1862.889491] RTW: bDescriptorType=5 [ 1862.889525] RTW: bEndpointAddress=8 [ 1862.889559] RTW: wMaxPacketSize=512 [ 1862.889591] RTW: bInterval=0 [ 1862.889625] RTW: RT_usb_endpoint_is_bulk_out = 8 [ 1862.889646] RTW: [ 1862.889646] usb_endpoint_descriptor(5): [ 1862.889670] RTW: bLength=7 [ 1862.889701] RTW: bDescriptorType=5 [ 1862.889737] RTW: bEndpointAddress=9 [ 1862.889772] RTW: wMaxPacketSize=512 [ 1862.889806] RTW: bInterval=0 [ 1862.889839] RTW: RT_usb_endpoint_is_bulk_out = 9 [ 1862.889873] RTW: nr_endpoint=6, in_num=2, out_num=4 [ 1862.889873] [ 1862.889910] RTW: USB_SPEED_HIGH [ 1862.889937] RTW: CHIP TYPE: RTL8723DU [ 1862.890090] RTW: loadparam, Select P2P interface: iface_id:1 [ 1862.890593] RTW: Chip Version Info: CHIP_8723D_T4_1T1R_RomVer(0) [ 1862.890640] RTW: USB NumInPipe(2), NumOutPipe(4/4) [ 1862.890809] RTW: EEPROM type is E-FUSE [ 1862.891165] RTW: Boot from EFUSE, Autoload OK ! [ 1862.891663] RTW: hal_EfuseSwitchToBank: Efuse switch bank to 0 [ 1862.981769] RTW: hal_ReadEFuse_WiFi: data end at address=0x86 [ 1862.982020] RTW: HW EFUSE ......

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