linux-kernel - Re: [PATCH v2] rtw88: pci: Power cycle device during shutdown

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Message-Id: <20201001132856.57A09C433C8@smtp.codeaurora.org>
Date:   Thu,  1 Oct 2020 13:28:56 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     yhchuang@...ltek.com, briannorris@...omium.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org (open list:REALTEK WIRELESS DRIVER
        (rtw88)), netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH v2] rtw88: pci: Power cycle device during shutdown

Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:

> There are reports that 8822CE fails to work rtw88 with "failed to read DBI
> register" error. Also I have a system with 8723DE which freezes the whole
> system when the rtw88 is probing the device.
> 
> According to [1], platform firmware may not properly power manage the
> device during shutdown. I did some expirements and putting the device to
> D3 can workaround the issue.
> 
> So let's power cycle the device by putting the device to D3 at shutdown
> to prevent the issue from happening.
> 
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=206411#c9
> 
> BugLink: https://bugs.launchpad.net/bugs/1872984
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Patch applied to wireless-drivers-next.git, thanks.

44492e70adc8 rtw88: pci: Power cycle device during shutdown

-- 
https://patchwork.kernel.org/patch/11804271/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches