linux-kernel - Re: [PATCH v2] rtl8xxxu: fix RTL8723BU connection failure issue after warm reboot

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Message-ID: <CAB4CAwen5y7Z4GU7YgpVafyGexxaMDLzrZ949t9p+LiZ9TxAPA@mail.gmail.com>
Date:   Thu, 17 Oct 2019 10:26:18 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Jes Sorensen <Jes.Sorensen@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>
Cc:     linux-wireless <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH v2] rtl8xxxu: fix RTL8723BU connection failure issue after
 warm reboot

On Wed, Oct 16, 2019 at 9:54 AM Chris Chiu <chiu@...lessm.com> wrote:
>
> The RTL8723BU has problems connecting to AP after each warm reboot.
> Sometimes it returns no scan result, and in most cases, it fails
> the authentication for unknown reason. However, it works totally
> fine after cold reboot.
>
> Compare the value of register SYS_CR and SYS_CLK_MAC_CLK_ENABLE
> for cold reboot and warm reboot, the registers imply that the MAC
> is already powered and thus some procedures are skipped during
> driver initialization. Double checked the vendor driver, it reads
> the SYS_CR and SYS_CLK_MAC_CLK_ENABLE also but doesn't skip any
> during initialization based on them. This commit only tells the
> RTL8723BU to do full initialization without checking MAC status.
>
> Signed-off-by: Chris Chiu <chiu@...lessm.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@...il.com>

Sorry, I forgot to add Jes.

Chris
> ---
>
> Note:
>   v2: fix typo of commit message
>
>