linux-kernel - Re: [PATCH v2] arm64: dts: hikey: Give wifi some time after power-on

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Date:   Fri, 1 Feb 2019 16:34:07 +0000
From:   Wei Xu <xuwei5@...ilicon.com>
To:     Jan Kiszka <jan.kiszka@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
CC:     Ryan Grachek <ryan@...ted.us>,
        John Stultz <john.stultz@...aro.org>,
        <linux-wireless@...r.kernel.org>, "Reizer, Eyal" <eyalr@...com>,
        "Valentin Schneider" <valentin.schneider@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v2] arm64: dts: hikey: Give wifi some time after power-on

Hi Jan,

On 1/24/2019 7:52 AM, Jan Kiszka 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 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@...mens.com>
> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

Applied to the hisilicon soc dt tree.
Thanks!

Best Regards,
Wei

> ---
> 
> Changes in v2:
>  - set delay to 10 ms
>  - updated changelog
> 
> Who will take care of updating also the Hikey firmware dts with this
> change?
> 
>  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 610235028cc7..ba946543dd0a 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 = <10>;
>  		power-off-delay-us = <10>;
>  	};
> 
> --
> 2.16.4
> 
> .
>