linux-kernel - Re: [PATCH v2] arm64: dts: zcu100-revC: Give wifi some time after power-on

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Date:   Fri, 25 Jan 2019 13:38:34 +0100
From:   Michal Simek <michal.simek@...inx.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>,
        Wei Xu <xuwei5@...ilicon.com>
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>,
        Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH v2] arm64: dts: zcu100-revC: Give wifi some time after
 power-on

On 24. 01. 19 9:28, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> Somewhere along recent changes to power control of the wl1831, power-on
> became very unreliable on the Ultra96, 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,
> Ultra96 is already happy with 10 ms.
> 
> Fixes: 5869ba0653b9 ("arm64: zynqmp: Add support for Xilinx zcu100-revC")
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> 
> Changes in v2:
>  - fix changelog
> 
>  arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> index 13a0a028df98..e5699d0d91e4 100644
> --- a/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> +++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts
> @@ -101,6 +101,7 @@
>  	sdio_pwrseq: sdio-pwrseq {
>  		compatible = "mmc-pwrseq-simple";
>  		reset-gpios = <&gpio 7 GPIO_ACTIVE_LOW>; /* WIFI_EN */
> +		post-power-on-delay-ms = <10>;
>  	};
>  };
> 
> --
> 2.16.4
> 

Applied.

Thanks,
Michal