netdev - Re: [PATCH] wifi: wilc1000: Rework bus locking

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Message-ID: <b287f8f9-600e-4e69-b7ec-25990275575e@denx.de>
Date: Sat, 16 Nov 2024 20:57:36 +0100
From: Marek Vasut <marex@...x.de>
To: Ajay.Kathat@...rochip.com, alexis.lothore@...tlin.com,
 linux-wireless@...r.kernel.org
Cc: davem@...emloft.net, adham.abozaeid@...rochip.com,
 claudiu.beznea@...on.dev, conor+dt@...nel.org, edumazet@...gle.com,
 kuba@...nel.org, kvalo@...nel.org, krzk+dt@...nel.org, pabeni@...hat.com,
 robh@...nel.org, devicetree@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] wifi: wilc1000: Rework bus locking

On 11/15/24 9:04 PM, Ajay.Kathat@...rochip.com wrote:

Hello Ajay,

>>>>> Can you explain how to prevent that or shall we disable uAPSD
>>>>> altogether ?
>>>>
>>>> Could you please share the test procedure and logs. I am occupied at the
>>>> moment but I shall make some time to look into it and get a better
>>>> understanding.
>>>
>>> The simplest test procedure is this:
>>>
>>> $ while true ; do ifconfig wlan0 up ; ifconfig wlan0 down ; done
>>>
>>> As for the logs, MMCI controller sporadically reports either Command or
>>> Data CRC error, so likely the SDIO response (from WILC to Host) is
>>> corrupted.
>>
>> Are there any news ?
> 
> I did test the same procedure in my setup, but I couldn't reproduce this issue
> even after running it for a long duration. In my test setup, I used the
> sama5d27-som1-ek1 host and wilc3000 firmware version 16.3.
> 
> I think this issue could be related to the host MMCI controller driver.
> Normally, the wilc SDIO bus failures are captured by driver logs with an error
> code (e.g., timeout), but if the MMCI controller is outputting the warning
> message, then the error could be related to it. Does the MMCI controller error
> point to any specific function?

Either CMD52 or CMD53 errors out with CRC error, this is recognized by 
the controller. That points to sporadic CRC error during SDIO transfer.

> Which host was used to test this scenario, and
> is it possible to test with different host or different configuration on the
> same host

I am observing sporadic command and data CRC errors on STM32MP157F 
system with SDIO WILC3000.

, like disabling power save on the host?
I already tested disabling power save.

Can you explain why does uAPSD (iw ...set power_save off) adversely 
affect SDIO bus stability ?

Can you explain how to prevent that or shall we disable uAPSD altogether ?

Is there any way to make the WILC firmware produce debug output , so we 
can figure out what is going on "on the other side" ?

Are you able to provide me (maybe off-list) some debug firmware build ?
(or can I get firmware sources and build and debug my own WILC firmware 
on the Cortus CPU?)

I can trigger the SDIO errors even without being connected to any AP , 
so this is something between the WILC and the SDIO host, the radio is 
likely not involved , right ?