From: Jan Kiszka <jan.kiszka@web.de>
To: Ulf Hansson <ulf.hansson@linaro.org>,
John Stultz <john.stultz@linaro.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Wei Xu <xuwei5@hisilicon.com>, Ryan Grachek <ryan@edited.us>,
linux-wireless@vger.kernel.org, "Reizer, Eyal" <eyalr@ti.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Tony Lindgren <tony@atomide.com>,
Kalle Valo <kvalo@codeaurora.org>,
KISHON VIJAY ABRAHAM <kishon@ti.com>, "Mishol, Guy" <guym@ti.com>,
Anders Roxell <anders.roxell@linaro.org>,
Ricardo Salveti <rsalveti@rsalveti.net>
Subject: Re: [PATCH] arm64: dts: hikey: Give wifi some time after power-on
Date: Sun, 6 Jan 2019 10:53:05 +0100 [thread overview]
Message-ID: <e4977d44-567a-5266-4617-ba62d194a666@web.de> (raw)
In-Reply-To: <CAPDyKFrY58-x3SsUwhfrLvf=hayhdjQZJWqUpmegArmnEsWATg@mail.gmail.com>
On 03.01.19 22:32, Ulf Hansson wrote:
> On Wed, 2 Jan 2019 at 23:21, John Stultz <john.stultz@linaro.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@web.de> wrote:
>>>
>>> From: Jan Kiszka <jan.kiszka@siemens.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!
Jan
> Kind regards
> Uffe
>
>>>
>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>> ---
>>>
>>> Tested with 4.19 and linus/master.
>>>
>>> arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 +
>>> 1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
>>> b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
>>> index f4964bee6a1a..1e771bf201b9 100644
>>> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
>>> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
>>> @@ -118,6 +118,7 @@
>>> reset-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
>>> clocks = <&pmic>;
>>> clock-names = "ext_clock";
>>> + post-power-on-delay-ms = <1>;
>>> power-off-delay-us = <10>;
>>> };
>>>
>>> --
>>> 2.16.4
next prev parent reply other threads:[~2019-01-06 9:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-30 11:38 [PATCH] arm64: dts: hikey: Give wifi some time after power-on Jan Kiszka
2019-01-02 22:21 ` John Stultz
2019-01-03 21:32 ` Ulf Hansson
2019-01-06 9:53 ` Jan Kiszka [this message]
2019-01-15 8:10 ` Jan Kiszka
2019-01-15 8:13 ` Ulf Hansson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e4977d44-567a-5266-4617-ba62d194a666@web.de \
--to=jan.kiszka@web.de \
--cc=anders.roxell@linaro.org \
--cc=eyalr@ti.com \
--cc=guym@ti.com \
--cc=john.stultz@linaro.org \
--cc=kishon@ti.com \
--cc=kvalo@codeaurora.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=rsalveti@rsalveti.net \
--cc=ryan@edited.us \
--cc=tony@atomide.com \
--cc=ulf.hansson@linaro.org \
--cc=valentin.schneider@arm.com \
--cc=xuwei5@hisilicon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).