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

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Date:   Thu, 24 Jan 2019 07:29:26 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Jan Kiszka <jan.kiszka@....de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Wei Xu <xuwei5@...ilicon.com>, 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>,
        Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH v2] arm64: dts: zcu100-revC: Give wifi some time after
 power-on

* Jan Kiszka <jan.kiszka@....de> [190124 08:29]:
> 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.

Good to hear this got sorted out, thanks everybody.

Acked-by: Tony Lindgren <tony@...mide.com>