wlan freezes in raspberry pi 3B+

(see also #1342 )

I've also got that problem with wifi dying.

Mar 17 18:25:28 hassass kernel: [10279.186321] brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content: 0x40012
Mar 17 18:25:30 hassass kernel: [10281.665090] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
Mar 17 18:25:30 hassass kernel: [10281.665622] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle
Mar 17 18:25:30 hassass kernel: [10281.665638] brcmfmac: brcmf_run_escan: error (-110)
Mar 17 18:25:30 hassass kernel: [10281.665647] brcmfmac: brcmf_cfg80211_scan: scan error (-110)
Mar 17 18:26:30 hassass kernel: [10341.665866] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout

This is with 4.14.27-v7+ and with
/sbin/iw dev wlan0 set power_save off
/sbin/ifconfig wlan0 promisc
in /etc/rc.local.

[    4.112717] brcmfmac: F1 signature read @0x18000000=0x15264345
[    4.119827] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[    4.120314] usbcore: registered new interface driver brcmfmac
[    4.440371] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb
27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[    4.440958] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2
Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09
18:56:28
[   10.911757] brcmfmac: power management disabled
[   12.016088] brcmfmac: power management disabled
[ 2074.090674] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg
failed w/status -5
[ 2074.090687] brcmfmac: brcmf_cfg80211_get_tx_power: error (-5)
[ 2074.090745] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2074.090753] brcmfmac: brcmf_link_down: WLC_DISASSOC failed (-5)
[ 2074.610583] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2074.611992] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2074.613945] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2074.613971] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5)
[ 2074.729716] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2074.729733] brcmfmac: brcmf_cfg80211_reg_notifier: Country code iovar
returned err = -5
[ 2074.871693] usbcore: deregistering interface driver brcmfmac
[ 2074.929084] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 2074.936897] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 2074.937139] usbcore: registered new interface driver brcmfmac
[ 2075.118180] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb
27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 2075.118706] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2
Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09
18:56:28
[ 2075.215365] brcmfmac: power management disabled
[ 2075.263751] brcmfmac: power management disabled
[ 2085.475001] brcmfmac: power management disabled
[ 2124.380808] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2124.381146] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 2124.381156] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5)
[ 2124.622345] usbcore: deregistering interface driver brcmfmac
[ 2124.705432] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 2124.714194] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 2124.716213] usbcore: registered new interface driver brcmfmac
[ 2124.929556] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb
27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 2124.929993] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2
Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09
18:56:28
[ 2125.105218] brcmfmac: power management disabled
[ 2125.150290] brcmfmac: power management disabled
[ 8237.434034] brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content:
0x40012
[ 8239.890302] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
[ 8239.890822] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle
[ 8239.890835] brcmfmac: brcmf_run_escan: error (-110)
[ 8239.890845] brcmfmac: brcmf_cfg80211_scan: scan error (-110)
[ 8254.280425] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg
failed w/status -5
[ 8254.280438] brcmfmac: brcmf_cfg80211_get_tx_power: error (-5)
[ 8254.280491] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8254.280498] brcmfmac: brcmf_link_down: WLC_DISASSOC failed (-5)
[ 8254.800394] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8254.803873] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8254.808353] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8254.808370] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5)
[ 8254.881402] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8254.881420] brcmfmac: brcmf_cfg80211_reg_notifier: Country code iovar
returned err = -5
[ 8255.001550] usbcore: deregistering interface driver brcmfmac
[ 8255.071184] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 8255.077098] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 8255.077348] usbcore: registered new interface driver brcmfmac
[ 8257.730418] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
[ 8257.751038] brcmfmac: brcmf_c_get_clm_name: retrieving revision info
failed (-110)
[ 8257.751049] brcmfmac: brcmf_c_process_clm_blob: get CLM blob file name
failed (-110)
[ 8257.751068] brcmfmac: brcmf_c_preinit_dcmds: download CLM blob file
failed, -110
[ 8257.751076] brcmfmac: brcmf_bus_started: failed: -110
[ 8257.751114] brcmfmac: brcmf_sdio_firmware_callback: dongle is not
responding
[ 8304.417684] usbcore: deregistering interface driver brcmfmac
[ 8304.486099] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 8304.493613] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 8304.494078] usbcore: registered new interface driver brcmfmac
[ 8304.686761] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb
27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 8304.687203] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2
Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09
18:56:28
[ 8304.829994] brcmfmac: power management disabled
[ 8304.907662] brcmfmac: power management disabled
[ 8357.441791] brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content:
0x40012
[ 8359.891146] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
[ 8359.891655] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle
[ 8359.891668] brcmfmac: brcmf_run_escan: error (-110)
[ 8359.891677] brcmfmac: brcmf_cfg80211_scan: scan error (-110)
[ 8371.731226] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
[ 8371.731731] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle
[ 8371.731746] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-110)
[ 8373.941267] brcmfmac: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg
failed w/status -5
[ 8373.941280] brcmfmac: brcmf_cfg80211_get_tx_power: error (-5)
[ 8373.941330] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8373.941338] brcmfmac: brcmf_link_down: WLC_DISASSOC failed (-5)
[ 8374.461245] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8374.461942] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8374.463553] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8374.463573] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5)
[ 8374.564729] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing
to do.
[ 8374.564750] brcmfmac: brcmf_cfg80211_reg_notifier: Country code iovar
returned err = -5
[ 8374.702401] usbcore: deregistering interface driver brcmfmac
[ 8374.759839] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 8374.767561] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 8374.771137] usbcore: registered new interface driver brcmfmac
[ 8377.411255] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
[ 8377.431924] brcmfmac: brcmf_c_get_clm_name: retrieving revision info
failed (-110)
[ 8377.431934] brcmfmac: brcmf_c_process_clm_blob: get CLM blob file name
failed (-110)
[ 8377.431941] brcmfmac: brcmf_c_preinit_dcmds: download CLM blob file
failed, -110
[ 8377.431949] brcmfmac: brcmf_bus_started: failed: -110
[ 8377.432003] brcmfmac: brcmf_sdio_firmware_callback: dongle is not
responding
[ 8424.133114] usbcore: deregistering interface driver brcmfmac
[ 8424.229631] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 8424.237210] brcmfmac: brcmf_fw_map_chip_to_name: using
brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 8424.239352] usbcore: registered new interface driver brcmfmac
[ 8424.460736] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb
27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 8424.461174] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2
Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09
18:56:28
[ 8424.646993] brcmfmac: power management disabled
[ 8424.708633] brcmfmac: power management disabled

[digisaster]

Same problem here.

If i do a:
sudo BRANCH=next rpi-update
Then i have a working situation.
After this i got:
uname -a
Linux raspberrypi 4.14.17-v7+ #1090 SMP Mon Feb 5 21:02:18 GMT 2018 armv7l GNU/Linux

So i guess its kernel related.

[JamesH65]

Interesting. So not in the current rpi-update, but in the next branch? Should make the particular change a bit easier to find.

any news?

[JamesH65]

Not had a chance to look yet. How do you provoke the problem? We've not had many reports on B+ Wifi failing in this way, so apparently it's unusual. Have you updated to the very latest 4.14.xx kernel? Does that make any difference?

[JamesH65]

Once I have more details on how to replicate the issues, I can send the data to Cypress for investigation. The mailbox error, IIRC, is a firmware crash, so its not something we can really deal with here, since we do not have access to the firmware.

[llamasoft]

It may be slightly off topic because it's a different distribution, but it's pretty easy to trigger this error when using Kali Pi.
Putting the device into monitor mode (using mon0up in Kali-Pi) and running aireplay-ng --test causes it to emit the Unknown mailbox data content: 0x40012 error almost immediately. From then on, the wifi is worthless until you reboot.

For reference, mon0up is a short shell script that runs iw phy phy0 interface add mon0 type monitor and ifconfig mon0 up and displays some brief info.

[cdouglas97]

On a project I am working on, I am getting this constantly with Kali Pi when in monitor mode. Unloading and reloading the driver works sometimes and sometimes not. Sometimes it happens after 5 seconds, sometimes after 5 minutes, very random. Verified its not a hardware problem since I have 2 Pi's and both do it. I also loaded Raspbian latest and installed latest Nextmon drivers and I get the exact same thing, Kernel is 4.14.30-Re4son-v7+ on Kali. Don't have other offhand.

[JamesH65]

Do you get any errors listed in dmesg?

[cdouglas97]

Yes I do. The following is while running the following command, The Set Channel failed aren’t really errors it seems since I am scanning a range /usr/sbin/airodump-ng -C 2412-5825 --write-interval 10 --write test --output-format netxml wlan0mon Working until this point…….. [78833.305809] brcmfmac: brcmf_sdio_hostmail: Unknown mailbox data content: 0x40012 [78835.790416] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78835.797410] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78835.803824] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=53409, -110 [78838.590434] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78838.597330] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78838.603733] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=53413, -110 [78841.390457] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78841.397407] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78841.403867] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=4098, -110 [78844.190483] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78844.197466] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78844.204088] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=4102, -110 [78846.990502] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78846.997678] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78847.004601] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=4106, -110 [78849.790519] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78849.797885] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78849.804936] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=4110, -110 [78852.590543] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78852.597968] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78852.605103] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=53284, -110 [78855.390563] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78855.398051] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78855.405211] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=53288, -110 [78858.190583] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78858.198319] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [78858.205591] brcmfmac: brcmf_cfg80211_nexmon_set_channel: Set Channel failed: chspec=53292, -110 [78860.990609] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [78861.001145] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle ……. After shutting down airodump, I detected that it wasn’t capturing anything and attempted to unload at 79803.439351 and reload the driver at 79923.711128 and that failed. I have a 120sec timer between unload and reload of driver [79782.517551] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [79782.529849] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [79782.541559] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-110) [79785.157565] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [79785.169936] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [79785.181530] brcmfmac: _brcmf_set_multicast_list: Setting mcast_list failed, -110 [79787.717590] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [79787.729703] brcmfmac: brcmf_sdio_checkdied: firmware trap in dongle [79792.837633] brcmfmac: _brcmf_set_multicast_list: Setting allmulti failed, -110 [79797.957685] brcmfmac: brcmf_cfg80211_del_ap_iface: interface_remove failed -110 [79800.517694] brcmfmac: _brcmf_set_multicast_list: Setting BRCMF_C_SET_PROMISC failed, -110 [79803.078132] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing to do. [79803.089706] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5) [79803.187727] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing to do. [79803.199528] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing to do. [79803.210553] brcmfmac: brcmf_cfg80211_get_channel: chanspec failed (-5) [79803.439351] usbcore: deregistering interface driver brcmfmac [79923.696268] brcmfmac: F1 signature read @0x18000000=0x15264345 [79923.700624] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006 [79923.711128] usbcore: registered new interface driver brcmfmac [79926.358647] brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout [79926.389146] brcmfmac: brcmf_c_get_clm_name: retrieving revision info failed (-110) [79926.400840] brcmfmac: brcmf_c_process_clm_blob: get CLM blob file name failed (-110) [79926.412661] brcmfmac: brcmf_c_preinit_dcmds: download CLM blob file failed, -110 [79926.423176] brcmfmac: brcmf_bus_started: failed: -110 [79926.431387] brcmfmac: brcmf_sdio_firmware_callback: dongle is not responding … Tried unload and reload a little while later and it worked [80685.169424] usbcore: deregistering interface driver brcmfmac [80805.455360] brcmfmac: F1 signature read @0x18000000=0x15264345 [80805.460216] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006 [80805.471390] usbcore: registered new interface driver brcmfmac [80805.805728] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Apr 10 2018 18:33:56 version 7.45.154 (nexmon.org: 2.2.2-178-gd64f-1) FWID 01-4fbe0b04 [80805.814840] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2 Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09 18:56:28 From: James Hughes [mailto:notifications@github.com] Sent: Wednesday, June 6, 2018 4:11 AM To: raspberrypi/linux <linux@noreply.github.com> Cc: Chris Douglas <cdouglas@securustechnologies.com>; Comment <comment@noreply.github.com> Subject: Re: [raspberrypi/linux] wlan freezes in raspberry pi 3B+ (#2453) Do you get any errors listed in dmesg? — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#2453 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AGrL91e9G5lSPwp1PtKvluye60-lz8K8ks5t55yhgaJpZM4SwkCN>. Click here<https://www.mailcontrol.com/sr/2xffoH0VKMPGX2PQPOmvUsgYVF5ojvBykkW9UzADy!8LKeLB79zZKi4csdmxhkuDqLqNh6I9BzeTKOxjbsImtQ==> to report this email as spam.

[Nemesis7]

Any news about this? I'm having this same issue. From dmesg:

[ 4.584121] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for chip 0x004345(17221) rev 0x000006
[ 4.868470] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 4.869048] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2 Data: 9.10.105 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2018-03-09 18:56:28

I wish I never executed the rpi-update; I finally got the Raspberry Pi 3 B+ working as an AP + Managed Wifi at 5GHz, but now the AP doesn't work anymore after the update. How can I downgrade the brcmfmac to a stable/working version?

[gdb-power]

After "Unknown mailbox data content: 0x40012" is received,
sometimes the communication can be recovered with the following commands:

modprobe -r brcmfmac
modprobe brcmfmac

Sometimes it doesn't recover even after modprobe -r (device is stuck).
In that case, the following heavy-handed commands will fix the communication with the wifi device:

echo -n "3f300000.mmc" > /sys/devices/platform/soc/3f300000.mmc/driver/unbind
sleep 1
echo -n "3f300000.mmc" > /sys/bus/platform/drivers/mmc-bcm2835/bind

technical comment:
rebinding the mmc driver will call probe(),
which will call mmc:bcm2835_reset_internal(),
which will power-cycle the SDIO device (SDVDD_POWER_OFF),
which will properly reset & re-detect the wedged WIFI SDIO device. Phew!

[cdouglas97]

I’ll try it Monday and let you know. Thank you very much.

…

Sent from my iPhone On Jun 10, 2018, at 11:45 AM, gdb-power <notifications@github.com<mailto:notifications@github.com>> wrote: After "Unknown mailbox data content: 0x40012" is received, sometimes the communication can be recovered with the following commands: modprobe -r brcmfmac modprobe brcmfmac Sometimes it doesn't recover even after modprobe -r (device is stuck). In that case, the following heavy-handed commands will fix the communication with the wifi device: echo -n "3f300000.mmc" > /sys/devices/platform/soc/3f300000.mmc/driver/unbind sleep 1 echo -n "3f300000.mmc" > /sys/bus/platform/drivers/mmc-bcm2835/bind technical comment: rebinding the driver will call probe(), which will call bcm2835_reset_internal(), which will power-cycle the SDIO device (SDVDD_POWER_OFF), which will properly reset the wedged WIFI SDIO device. Phew! — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#2453 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AGrL98NH4vq7R7-4fV5e33BpV9YdoCDTks5t7U0ZgaJpZM4SwkCN>. Click here<https://www.mailcontrol.com/sr/FMgA5hvnUJvGX2PQPOmvUml+xXZX6IbqMNHcSExTXLGLfL5y4bkCVFXj2zyDaOvSKw2HpqN63pJ+U88fPeCTtg==> to report this email as spam.