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aodzip

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注册时间： 2019-10-15

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MT7601u rx urb failed: -71 解决方案

典型症状如下

[   85.238760] usb 1-1.4: new high-speed USB device number 35 using ehci-platform
[   85.418843] usb 1-1.4: New USB device found, idVendor=148f, idProduct=7601, bcdDevice= 0.00
[   85.427206] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   85.434540] usb 1-1.4: Product: 802.11 n WLAN
[   85.438909] usb 1-1.4: SerialNumber: 1.0
[   85.658773] usb 1-1.4: reset high-speed USB device number 35 using ehci-platform
[   85.711960] mt7601u 1-1.4:1.0: ASIC revision: 76010001 MAC revision: 76010500
[   85.720941] mt7601u 1-1.4:1.0: Firmware Version: 0.1.00 Build: 7640 Build time: 201302052146____
[   86.167971] mt7601u 1-1.4:1.0: EEPROM ver:0c fae:00
[   86.366367] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.371220] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.376970] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.386490] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.391620] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.397381] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.406739] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.411822] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.417575] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.426855] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.431907] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.437675] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.446980] mt7601u 1-1.4:1.0: rx urb failed: -71
[   86.452029] mt7601u 1-1.4:1.0: Error: MCU resp urb failed:-71
[   86.457789] mt7601u 1-1.4:1.0: Error: MCU resp evt:0 seq:5-4!
[   86.463589] mt7601u 1-1.4:1.0: Error: mt7601u_mcu_wait_resp timed out
[   86.778760] mt7601u 1-1.4:1.0: Vendor request req:07 off:0080 failed:-71
[   87.088761] mt7601u 1-1.4:1.0: Vendor request req:02 off:0080 failed:-71
[   87.398756] mt7601u 1-1.4:1.0: Vendor request req:02 off:0080 failed:-71
[   87.405586] mt7601u: probe of 1-1.4:1.0 failed with error -110
[   87.420875] usb 1-1.4: USB disconnect, device number 35

解决方案
我跟你讲这芯片超耗电的

模块厂商会说这模块典型耗电110mA，相信的话就GG

来看看MTK怎么说的

加电容也许不是最好的办法，但是能稍微缓解(470uF)

还是换更好的供电吧，小LDO基本都秒杀了，按300mA的典型值设计吧

最近编辑记录 aodzip (2020-04-09 09:59:57)