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

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Message-ID: <9888f605-ee68-4bd3-8d1d-aeef247d23d0@microchip.com>
Date: Thu, 7 Nov 2024 01:28:43 +0000
From: <Ajay.Kathat@...rochip.com>
To: <marex@...x.de>, <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

Hi Marek,

On 11/4/24 04:44, Marek Vasut wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the
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> 
> On 10/23/24 8:47 PM, Marek Vasut wrote:
> 
> Hello again,
> 
>>> Is power-save enabled during the test. With PS enabled, The SDIO
>>> commands may
>>> fail momentarily but it should recover.
>>
>> It seems it gets enabled after first ifconfig up, that's a good hint,
>> I'll try to disable it and see if that makes them errors go away. Thanks!
>>
>> Do you have any details on WHY would such sporadic errors occur and how
>> to make those go away even with PS enabled ?
> Can you explain why does uAPSD (iw ...set power_save off) adversely
> affect SDIO bus stability ?
> 

SDIO bus errors can occur for different reasons and those errors can be of
recoverable or non-recoverable type. For non-recoverable failures like
firmware crashes, the retry mechanism may not help to resolve the issue. If
the error is recoverable then driver should work with retry attempts.
I think you are observing the bus errors messages and it is recovering after
that. Is my understanding correct?

With the previous shared test procedure, which makes the interface up/down
continuously, the station may not go into the Doze/Awake sequence since that
mode switching gets activated after connection with AP.

> 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.

Regard,
Ajay