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From:   Piotr Oniszczuk <piotr.oniszczuk@gmail.com>
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Subject: Current mainline brcmfmac reports error on supposedly supported
 ap6256 chip
Message-Id: <DAA2C28E-0CF2-4A1C-9110-BDEB85ADC09B@gmail.com>
Date:   Sat, 24 Jul 2021 15:22:38 +0200
To:     brcm80211-dev-list.pdl@broadcom.com, linux-wireless@vger.kernel.org
Precedence: bulk

Dears,

I working on adding support in mainline kernel for radxa-zero SBC.
=
https://www.cnx-software.com/2021/06/16/radxa-zero-sbc-quad-core-raspberry=
-pi-zero-w-alternative/ =20

So far all seems to be working well on mainline 5.13.4 kernel except =
WiFi.

radxa-zero SBC uses SDIO attached AP6256 WiFi/BT module.
Chip seems to be communicating with brcmfmac driver - but kernel dmesg =
reports error like below.

(output is after kernel compile with:

CONFIG_BRCM_TRACING=3Dy
CONFIG_BRCMDBG=3Dy

and

echo 8 > /proc/sys/kernel/printk
modprobe brcmfmac debug=3D0x6)


5.13.4 dmesg from brcmfmac probing:

[  138.188502] brcmfmac: brcmfmac_module_init No platform data =
available.
[  138.189917] brcmfmac: brcmf_sdio_probe Enter
[  138.194049] brcmfmac: F1 signature read @0x18000000=3D0x15294345
[  138.199709] brcmfmac: brcmf_chip_recognition found AXI chip: =
BCM4345/9
[  138.207838] brcmfmac: brcmf_chip_cores_check  [1 ] core 0x800:51 base =
0x18000000 wrap 0x18100000
[  138.214720] brcmfmac: brcmf_chip_cores_check  [2 ] core 0x812:54 base =
0x18001000 wrap 0x18101000
[  138.223405] brcmfmac: brcmf_chip_cores_check  [3 ] core 0x83e:9  base =
0x18002000 wrap 0x18102000
[  138.232112] brcmfmac: brcmf_chip_cores_check  [4 ] core 0x83c:14 base =
0x18003000 wrap 0x18103000
[  138.240834] brcmfmac: brcmf_chip_cores_check  [5 ] core 0x829:21 base =
0x18004000 wrap 0x18104000
[  138.249534] brcmfmac: brcmf_chip_cores_check  [6 ] core 0x135:0  base =
0x00000000 wrap 0x18107000
[  138.258248] brcmfmac: brcmf_chip_cores_check  [7 ] core 0x240:0  base =
0x00000000 wrap 0x00000000
[  138.266957] brcmfmac: brcmf_chip_set_passive Enter
[  138.274227] brcmfmac: brcmf_chip_get_raminfo RAM: base=3D0x198000 =
size=3D0 (0x0) sr=3D0 (0x0)
[  138.279634] brcmfmac: brcmf_chip_get_raminfo: RAM size is =
undetermined
[  138.286085] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach =
failed!
[  138.292725] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach =
failed
[  138.299190] brcmfmac: brcmf_sdio_remove Enter
[  138.303476] brcmfmac: brcmf_detach Enter
[  138.307444] brcmfmac: brcmf_sdio_remove Disconnected
[  138.312361] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed =
-19...
[  138.319198] usbcore: registered new interface driver brcmfmac

i tested fw ver 7.45.96.61 and also a bit newer ver. (7.45.96.68). both =
are giving the same error. removing firmware changes nothing - so i =
think issue is in frcmfmac kernel code which is not ready yet for chip =
variant used in radxa-zero ap6256 wifi module.

Full kernel dmesg: https://pastebin.com/VT1tQUJY=20

May you pls advise me how to move forward with this issue?