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Subject: Re: [PATCH v2] arm64: dts: zcu100-revC: Give wifi some time after
 power-on
To:     Jan Kiszka <jan.kiszka@web.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Wei Xu <xuwei5@hisilicon.com>
CC:     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>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        Tony Lindgren <tony@atomide.com>,
        Michal Simek <michal.simek@xilinx.com>
References: <efc793c8-da17-e267-851e-f08f097843ee@web.de>
From:   Michal Simek <michal.simek@xilinx.com>
Message-ID: <bf8ed343-d9af-c7d3-0836-6dda2b3e8243@xilinx.com>
Date:   Fri, 25 Jan 2019 13:38:34 +0100
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On 24. 01. 19 9:28, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.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@siemens.com>
> Acked-by: Ulf Hansson <ulf.hansson@linaro.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