linux-kernel - Re: [PATCH] wifi: rtl8xxxu: fixing IQK failures for rtl8192eu

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Date:   Thu, 1 Dec 2022 09:38:40 +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 IQK failures for rtl8192eu

On 01/12/2022 8:54 am, Ping-Ke Shih wrote:

>
>> -----Original Message-----
>> From: JunASAKA <JunASAKA@...040330.moe>
>> Sent: Wednesday, November 30, 2022 10:09 PM
>> 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; JunASAKA
>> <JunASAKA@...040330.moe>
>> Subject: [PATCH] wifi: rtl8xxxu: fixing IQK failures for rtl8192eu
>>
>> Fixing "Path A RX IQK failed" and "Path B RX IQK failed"
>> issues for rtl8192eu chips by replacing the arguments with
>> the ones in the updated official driver.
> I think it would be better if you can point out which version you use, and
> people will not modify them back to old version suddenly.
>
>> Signed-off-by: JunASAKA <JunASAKA@...040330.moe>
>> ---
>>   .../realtek/rtl8xxxu/rtl8xxxu_8192e.c         | 76 +++++++++++++------
>>   1 file changed, 54 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
>> b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
>> index b06508d0cd..82346500f2 100644
>> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
>> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c
> [...]
>
>> @@ -891,22 +907,28 @@ static int rtl8192eu_iqk_path_b(struct rtl8xxxu_priv *priv)
>>
>>   	rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x00000000);
>>   	rtl8xxxu_write_rfreg(priv, RF_B, RF6052_REG_UNKNOWN_DF, 0x00180);
>> -	rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x80800000);
>>
>> -	rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x00000000);
>> +	rtl8xxxu_write_rfreg(priv, RF_B, RF6052_REG_WE_LUT, 0x800a0);
>> +	rtl8xxxu_write_rfreg(priv, RF_B, RF6052_REG_RCK_OS, 0x20000);
>> +	rtl8xxxu_write_rfreg(priv, RF_B, RF6052_REG_TXPA_G1, 0x0000f);
>> +	rtl8xxxu_write_rfreg(priv, RF_B, RF6052_REG_TXPA_G2, 0x07f77);
>> +
>>   	rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x80800000);
>>
>> +	// rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x00000000);
>> +	// rtl8xxxu_write32(priv, REG_FPGA0_IQK, 0x80800000);
>> +
> I think this is a test code of vendor driver. No need them here.
>
>
>>   	/* Path B IQK setting */
>>   	rtl8xxxu_write32(priv, REG_TX_IQK_TONE_A, 0x38008c1c);
>>   	rtl8xxxu_write32(priv, REG_RX_IQK_TONE_A, 0x38008c1c);
>>   	rtl8xxxu_write32(priv, REG_TX_IQK_TONE_B, 0x18008c1c);
>>   	rtl8xxxu_write32(priv, REG_RX_IQK_TONE_B, 0x38008c1c);
>>
>> -	rtl8xxxu_write32(priv, REG_TX_IQK_PI_B, 0x821403e2);
>> +	rtl8xxxu_write32(priv, REG_TX_IQK_PI_B, 0x82140303);
>>   	rtl8xxxu_write32(priv, REG_RX_IQK_PI_B, 0x68160000);
>>
>>   	/* LO calibration setting */
>> -	rtl8xxxu_write32(priv, REG_IQK_AGC_RSP, 0x00492911);
>> +	rtl8xxxu_write32(priv, REG_IQK_AGC_RSP, 0x00462911);
>>
>>   	/* One shot, path A LOK & IQK */
>>   	rtl8xxxu_write32(priv, REG_IQK_AGC_PTS, 0xfa000000);
> [...]
>
> I have compared your patch with internal code, and they are the same.
> But, I don't have a test.
>
> Ping-Ke

I changed those arguments into the ones here: 
https://github.com/Mange/rtl8192eu-linux-driver which works fine with my 
rtl8192eu wifi dongle. But forgive my ignorant that I don't have enough 
experience on wifi drivers, I just compared those two drivers and 
figured that those codes fixing my IQK failures.

I tested it on my PC (fedora 37 with kernel v6.1.0-rc7) with my 
rtl8192eu device and it works well.


Jun ASAKA.