New: asix 88772c does not work when chip is in RMII mode

https://bugzilla.kernel.org/show_bug.cgi?id=220286

            Bug ID: 220286
           Summary: asix 88772c does not work when chip is in RMII mode
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

I have two asix 88772c boards, with the standard module the board with (MAC -> PHY ) presents the proper ethernet interface. With the second board confiured for RMII (MAC->MAC) the following dmesg occurs:

[442357.683804] usb 1-1.3: new high-speed USB device number 4 using xhci_hcd
[442357.796351] usb 1-1.3: New USB device found, idVendor=0b95, idProduct=772b,
bcdDevice= 0.02
[442357.796380] usb 1-1.3: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[442357.796393] usb 1-1.3: Product: AX88772C
[442357.796403] usb 1-1.3: Manufacturer: ASIX Elec. Corp.
[442357.796412] usb 1-1.3: SerialNumber: 0037BC
[442358.469226] asix 1-1.3:1.0 (unnamed net_device) (uninitialized): PHY
[usb-001:004:10] driver [Asix Electronics AX88772C] (irq=POLL)
[442358.472403] Asix Electronics AX88772C usb-001:004:10: attached PHY driver
(mii_bus:phy_addr=usb-001:004:10, irq=POLL)
[442358.472895] asix 1-1.3:1.0 eth1: register 'asix' at usb-0000:01:00.0-1.3,
ASIX AX88772B USB 2.0 Ethernet, 00:0e:c6:00:37:bc
[442358.472995] usbcore: registered new interface driver asix
[442358.541752] asix 1-1.3:1.0 eth1: configuring for phy/internal link mode
[442360.596155] asix 1-1.3:1.0 eth1: Link is Up - 100Mbps/Full - flow control
rx/tx
[443025.975392] usb 1-1.3: USB disconnect, device number 4
[443025.975978] asix 1-1.3:1.0 eth1: unregister 'asix' usb-0000:01:00.0-1.3,
ASIX AX88772B USB 2.0 Ethernet
[443025.976091] asix 1-1.3:1.0 eth1: Failed to write reg index 0x0000: -19
[443025.976108] asix 1-1.3:1.0 eth1: Failed to enable software MII access
[443025.976153] asix 1-1.3:1.0 eth1: Failed to write reg index 0x0000: -19
[443025.976167] asix 1-1.3:1.0 eth1: Failed to write Medium Mode mode to
0x0000: ffffffed
[443025.976181] asix 1-1.3:1.0 eth1: Link is Down
[443026.003862] asix 1-1.3:1.0 eth1 (unregistered): Failed to write reg index
0x0000: -19
[443026.003896] asix 1-1.3:1.0 eth1 (unregistered): Failed to enable software

MII access

The current drivers from asix are able to work.

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