linux-kernel - RE: [PATCH] wifi: rtl8xxxu: fixing transmisison failure for rtl8192eu

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Date:   Tue, 20 Dec 2022 05:44:42 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Jun ASAKA <JunASAKA@...040330.moe>,
        "Jes.Sorensen@...il.com" <Jes.Sorensen@...il.com>
CC:     "kvalo@...nel.org" <kvalo@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] wifi: rtl8xxxu: fixing transmisison failure for rtl8192eu



> -----Original Message-----
> From: Jun ASAKA <JunASAKA@...040330.moe>
> Sent: Saturday, December 17, 2022 11:07 AM
> To: Jes.Sorensen@...il.com
> Cc: kvalo@...nel.org; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Jun ASAKA
> <JunASAKA@...040330.moe>
> Subject: [PATCH] wifi: rtl8xxxu: fixing transmisison failure for rtl8192eu
> 
> Fixing transmission failure which results in
> "authentication with ... timed out". This can be
> fixed by disable the REG_TXPAUSE.
> 
> Signed-off-by: Jun ASAKA <JunASAKA@...040330.moe>
> ---
>  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
> b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
> index a7d76693c02d..9d0ed6760cb6 100644
> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
> @@ -1744,6 +1744,11 @@ static void rtl8192e_enable_rf(struct rtl8xxxu_priv *priv)
>  	val8 = rtl8xxxu_read8(priv, REG_PAD_CTRL1);
>  	val8 &= ~BIT(0);
>  	rtl8xxxu_write8(priv, REG_PAD_CTRL1, val8);
> +
> +	/*
> +	 * Fix transmission failure of rtl8192e.
> +	 */
> +	rtl8xxxu_write8(priv, REG_TXPAUSE, 0x00);

I trace when rtl8xxxu set REG_TXPAUSE=0xff that will stop TX.
The occasions include RF calibration, LPS mode (called by power off), and
going to stop. So, I think RF calibration does TX pause but not restore
settings after calibration, and causes TX stuck. As the flow I traced,
this patch looks reasonable. But, I wonder why other people don't meet
this problem.

Reviewed-by: Ping-Ke Shih <pkshih@...ltek.com>

>  }
> 
>  static s8 rtl8192e_cck_rssi(struct rtl8xxxu_priv *priv, u8 cck_agc_rpt)
> --
> 2.31.1