[FS#3386] Regression: Broadcom Roboswitch B53

[OpenWrt Bugs]

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User who did this - Leonardo (humaita) 

Attached to Project - OpenWrt/LEDE Project
Summary - Regression: Broadcom Roboswitch B53
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Hi,

in the current trunk version, Broadcom Roboswitch will not work for certain router models. However, in the past it did work.

Building OpenWrt from scratch results in a working switch with v17.01.5 (from 15 Jul 2018 21:25:16) for target profile "Broadcom SOC, BCM43xx Wifi (brcmsmac)". Building OpenWrt from scratch for v18.06.0 (from 30 Jul 2018 18:44:34) results in the switch not working for the same target. So the problematic commit must have been between 15 Jul 2018 and 30 Jul 2018, and the problem is still present today.

------------
For v17.01.5
# dmesg | grep switch
[    3.596260] bgmac_bcma bcma0:2: Support for Roboswitch not implemented
[    3.683106] b53_common: found switch: BCM5325, rev 4

Despite the message "Roboswitch not implemented" the switch comes up automatically and I can ping other computers connected through the switch.

# swconfig dev switch0 show
Global attributes:
        enable_vlan: 1
        ports: 0x003f
Port 0:
        pvid: 2
        link: port:0 link:down
Port 1:
        pvid: 1
        link: port:1 link:down
Port 2:
        pvid: 1
        link: port:2 link:down
Port 3:
        pvid: 1
        link: port:3 link:up speed:100baseT full-duplex auto
Port 4:
        pvid: 1
        link: port:4 link:down
Port 5:
        pvid: 0
        link: port:5 link:up speed:100baseT full-duplex
VLAN 1:
        ports: 1 2 3 4 5t
VLAN 2:
        ports: 0 5t

------------
For v18.06.0
# dmesg | grep switch
[    4.174603] bgmac_bcma bcma0:2: Support for Roboswitch not implemented
[    4.275337] b53_common: unsupported switch detected (BCM5304/BCM4)
[    4.281640] Broadcom B53 (2) bcma_mdio-0-0:1e: failed to register switch: -22

The switch does not come up and thus I cannot ping.
------------

I tested this for the (unsuported) router Huawei B593u-12. You can find details about the router, logs, etc. under https://openwrt.org/toh/huawei/b593u-12

This also seems to address other routers, e.g. ZTE H218N, see https://forum.openwrt.org/t/b53-failed-to-detect-switch-on-bcm5358/20011

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3386

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