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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Mon, 4 Feb 2019 07:06:41 +0100
Message-ID: <CAPDyKFqYWGv7bWW7rcCYhc-PdmRCBdskUTycFxK25VQgd0TWeg@mail.gmail.com>
Subject: Re: [PATCH v2] arm64: dts: hikey: Give wifi some time after power-on
To:     Wei Xu <xuwei5@hisilicon.com>
Cc:     Jan Kiszka <jan.kiszka@web.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Ryan Grachek <ryan@edited.us>,
        John Stultz <john.stultz@linaro.org>,
        linux-wireless@vger.kernel.org, "Reizer, Eyal" <eyalr@ti.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Tony Lindgren <tony@atomide.com>
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On Fri, 1 Feb 2019 at 17:34, Wei Xu <xuwei5@hisilicon.com> wrote:
>
> Hi Jan,
>
> On 1/24/2019 7:52 AM, Jan Kiszka 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 would already be happy with 1 ms. Still, we use the safer 10 ms,
> > like on the Ultra96.
> >
> > Fixes: ea452678734e ("arm64: dts: hikey: Fix WiFi support")
> > Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> > Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
>
> Applied to the hisilicon soc dt tree.

Wei, can you please also add a stable tag to it?

[...]

Thanks and kind regards
Uffe