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Date:   Wed, 8 Sep 2021 14:36:14 +0900
From:   Dominique MARTINET <dominique.martinet@atmark-techno.com>
To:     linux-wireless@vger.kernel.org,
        Amitkumar Karwar <amitkarwar@gmail.com>,
        Jonas =?utf-8?Q?Dre=C3=9Fler?= <verdre@v0yd.nl>
Cc:     Takashi Iwai <tiwai@suse.de>, Tsuchiya Yuto <kitakar@gmail.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Arnd Bergmann <arnd@arndb.de>,
        Lee Jones <lee.jones@linaro.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        Xinming Hu <huxinming820@gmail.com>,
        Sharvari Harisangam <sharvari.harisangam@nxp.com>,
        Ganapathi Bhat <ganapathi017@gmail.com>
Subject: Re: mwifiex cmd timeout on one pci variant
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References: <YTg/f5mHQ6jjHDt6@atmark-techno.com>
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(+cc Jonas Dreßler, sorry for two mails in a row for others)

Dominique MARTINET wrote on Wed, Sep 08, 2021 at 01:43:43PM +0900:
> I've got a board with an i.MX8MP chip, and three different marvell W8997
> M.2 modules

(I just noticed Jonas' patches "mwifiex: Work around firmware bugs on
88W8897 chip" on linux-wireless, but it doesn't seem to change anything
for me, so my problem isn't related to pci post or interrupt wake
apparently. Was worth a try...)

I'm surprised though he says the latest firmware is 15.68.19.p21, but I
can't find it anywhere -- linux-firmware only has up to 16.68.1.p179 and
I got 16.68.10.p16 from NXP dependencies, and now I'm searching a bit
harder i also found 16.92.10.p124 !? (note 16.92 instead of 16.68, also
NXP) but I have no idea where to find anything 'official' from marvell
as git.marvell.com/mwifiex-firmware.git disappeared.

Where could I find this version you speak of?


Thanks,

> -- one from laird which works fine, and two from azurewave
> which are labeled exactly the same AW-CM276MA 2276MA PCIE-UART except
> one works and not the other.
> The inscription on the chip itself are slightly different, one saying
> it's a W8997-M1216 from marvell (works) and the other having AW-CM276NF
> azurewave mark. The electronics around are also different.
> 
> I could say it's just a bad chip, but I've actually got two of each
> (samples) which act the same... And I've tried it in another device
> where it works with the same kernel/firmware, so there must be something
> wrong on the board as well as the wifi card works elsewhere.
> 
> 
> Anyway, if someone knows how to get around to debugging this, I'd
> appreciate a pointer! I can't see anything wrong with the tools I have
> here.
> If nothing else, I can't read /sys/class/devcoredump/devcd*/data that I
> saw Amitkumar Karwar request somewhere else, so just deciphering this
> would be great help.
> 
> 
> dmesg looks like this on failure:
> [  108.513028] mwifiex_pcie 0000:01:00.0: mwifiex_cmd_timeout_func: Timeout cmd id = 0x10, act = 0x1
> [  108.522388] mwifiex_pcie 0000:01:00.0: num_data_h2c_failure = 0
> [  108.528310] mwifiex_pcie 0000:01:00.0: num_cmd_h2c_failure = 0
> [  108.534143] mwifiex_pcie 0000:01:00.0: is_cmd_timedout = 1
> [  108.539631] mwifiex_pcie 0000:01:00.0: num_tx_timeout = 0
> [  108.545029] mwifiex_pcie 0000:01:00.0: last_cmd_index = 0
> [  108.550431] mwifiex_pcie 0000:01:00.0: last_cmd_id: 10 00 28 00 16 00 cd 00 1e 00
> [  108.557913] mwifiex_pcie 0000:01:00.0: last_cmd_act: 01 00 13 00 01 00 01 00 00 00
> [  108.565484] mwifiex_pcie 0000:01:00.0: last_cmd_resp_index = 4
> [  108.571318] mwifiex_pcie 0000:01:00.0: last_cmd_resp_id: df 80 28 80 16 80 cd 80 1e 80
> [  108.579237] mwifiex_pcie 0000:01:00.0: last_event_index = 2
> [  108.584810] mwifiex_pcie 0000:01:00.0: last_event: 00 00 0b 00 0a 00 00 00 00 00
> [  108.592206] mwifiex_pcie 0000:01:00.0: data_sent=0 cmd_sent=1
> [  108.597954] mwifiex_pcie 0000:01:00.0: ps_mode=1 ps_state=0
> [  108.604085] mwifiex_pcie 0000:01:00.0: ===mwifiex driverinfo dump start===
> [  108.613552] mwifiex_pcie 0000:01:00.0: info: MWIFIEX VERSION: mwifiex 1.0 (16.68.1.p179) 
> [  108.621748] mwifiex_pcie 0000:01:00.0: PCIE register dump start
> [  108.627676] mwifiex_pcie 0000:01:00.0: pcie scratch register:
> [  108.633441] mwifiex_pcie 0000:01:00.0: reg:0xcf0, value=0xfedcba00
>                reg:0xcf8, value=0x8260049
>                reg:0xcfc, value=0x1282820
> 
> [  108.648584] mwifiex_pcie 0000:01:00.0: PCIE register dump end
> [  108.654411] mwifiex_pcie 0000:01:00.0: ===mwifiex driverinfo dump end===
> [  108.661119] mwifiex_pcie 0000:01:00.0: == mwifiex firmware dump start ==
> [  110.560689] mwifiex_pcie 0000:01:00.0: cmd_wait_q terminated: -110
> [  148.127107] mwifiex_pcie 0000:01:00.0: == mwifiex firmware dump end ==
> [  148.134552] mwifiex_pcie 0000:01:00.0: == mwifiex dump information to /sys/class/devcoredump start
> [  148.143669] mwifiex_pcie 0000:01:00.0: == mwifiex dump information to /sys/class/devcoredump end
> [  148.152485] mwifiex_pcie 0000:01:00.0: PREP_CMD: FW is in bad state
> [  148.158915] mwifiex_pcie 0000:01:00.0: info: shutdown mwifiex...
> [  148.165829] mwifiex_pcie 0000:01:00.0: PREP_CMD: card is removed
> [  148.443761] mwifiex_pcie 0000:01:00.0: info: dnld wifi firmware from 169340 bytes
> [  149.511193] mwifiex_pcie 0000:01:00.0: info: FW download over, size 632240 bytes
> [  150.163677] mwifiex_pcie 0000:01:00.0: WLAN FW is active
> [  150.231583] mwifiex_pcie 0000:01:00.0: info: MWIFIEX VERSION: mwifiex 1.0 (16.68.1.p179) 
> [  150.239814] mwifiex_pcie 0000:01:00.0: driver_version = mwifiex 1.0 (16.68.1.p179) 
> 
> I tried with two different firmwares, full dmesg and data.txt are here:
> hang on `ip link set mlan0 up`:
> https://codewreck.org/tmp/16.68.1.p179-data.txt
> https://codewreck.org/tmp/16.68.1.p179-dmesg
> 
> hang on `iw mlan0 scan` after successful link up:
> https://codewreck.org/tmp/16.68.1.p179-2-data.txt
> https://codewreck.org/tmp/16.68.1.p179-2-dmesg
> 
> other firmware (dmesg truncated to just timeout message):
> https://codewreck.org/tmp/16.68.10.p16-data.txt
> https://codewreck.org/tmp/16.68.10.p16-dmesg
> 
> 
> 
> Extra info:
>  - it doesn't always fail at the same place, so this looks like a
> tolerance problem? e.g. sometimes transmission works and sometimes
> a message is garbled?
> 
> - on the working azurewave module I can keep the card maxed at ~300mbps
> in or ~100mbps out without problem for a while with iperf so signals
> can't be that bad...? Or that could just be wishful thinking!
-- 
Dominique Martinet