linux-kernel - Re: [PATCH] arm64: dts: hikey: Give wifi some time after power-on

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Message-ID: <0a6e6ca5-3ea0-4f6a-63f1-96187700a4bc@web.de>
Date:   Tue, 15 Jan 2019 09:10:14 +0100
From:   Jan Kiszka <jan.kiszka@....de>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        John Stultz <john.stultz@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Wei Xu <xuwei5@...ilicon.com>, Ryan Grachek <ryan@...ted.us>,
        linux-wireless@...r.kernel.org, "Reizer, Eyal" <eyalr@...com>,
        Valentin Schneider <valentin.schneider@....com>,
        Tony Lindgren <tony@...mide.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        KISHON VIJAY ABRAHAM <kishon@...com>,
        "Mishol, Guy" <guym@...com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Ricardo Salveti <rsalveti@...lveti.net>
Subject: Re: [PATCH] arm64: dts: hikey: Give wifi some time after power-on

On 06.01.19 10:53, Jan Kiszka wrote:
> On 03.01.19 22:32, Ulf Hansson wrote:
>> On Wed, 2 Jan 2019 at 23:21, John Stultz <john.stultz@...aro.org> wrote:
>>>
>>> Adding a few folks to cc from the thread here:
>>> https://patchwork.kernel.org/patch/10734021/
>>>
>>> As this sounds like a very similar issue.
>>> thanks
>>> -john
>>
>> John, thanks for looping me in.
>>
>>>
>>> On Sun, Dec 30, 2018 at 3:38 AM Jan Kiszka <jan.kiszka@....de> wrote:
>>>>
>>>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>>>
>>>> Somewhere along recent changes to power control of the wl1835, power-on
>>>> became very unreliable on the hikey, failing like this:
>>>>
>>>> wl1271_sdio: probe of mmc2:0001:1 failed with error -16
>>>> wl1271_sdio: probe of mmc2:0001:2 failed with error -16
>>>>
>>>> After playing with some dt parameters and comparing to other users of
>>>> this chip, it turned out we need some power-on delay to make things
>>>> stable again. In contrast to those other users which define 200 ms, the
>>>> hikey is already very happy with 1 ms.
>>
>> According to the discussions we had so far, this doesn't sound like
>> the correct solution.
>>
>> I am intending to post patch soon, however, I am not sure exactly what
>> solution to pick yet. I will keep you on cc - and of course I
>> appreciate if you could help to test.
>>
> 
> FWIW, the Ultra96 is also affected. Here I worked around it by using a 10 ms 
> power-on delay. The original workaround from the other thread did not help. 
> Looking forward to the proper fix now!
> 

Any news on this regression?

Jan