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

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Date:   Tue, 20 Dec 2022 14:02:22 +0800
From:   Jun ASAKA <JunASAKA@...040330.moe>
To:     Ping-Ke Shih <pkshih@...ltek.com>,
        "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


On 20/12/2022 13:44, Ping-Ke Shih wrote:
>
>> -----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

For my occasion, one of my rtl8192ru device which is Tenda U1 doesn't 
work originally with this module, it prints "authentication with ... 
timed out" in dmesg. And this change can fix the problem.

Thanks for your review.


Jun ASAKA.