linux-kernel - RE: [PATCH] rtlwifi: rtl8192ce: fix dealing empty eeprom values

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Message-ID: <bd6e64305d7348a09a84448f72509767@realtek.com>
Date:   Mon, 13 Feb 2023 09:37:05 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Lu jicong <jiconglu58@...il.com>,
        "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>
CC:     "quic_srirrama@...cinc.com" <quic_srirrama@...cinc.com>,
        "johannes.berg@...el.com" <johannes.berg@...el.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] rtlwifi: rtl8192ce: fix dealing empty eeprom values



> -----Original Message-----
> From: Lu jicong <jiconglu58@...il.com>
> Sent: Sunday, February 12, 2023 8:06 PM
> To: Ping-Ke Shih <pkshih@...ltek.com>; kvalo@...nel.org; davem@...emloft.net; edumazet@...gle.com;
> kuba@...nel.org; pabeni@...hat.com
> Cc: quic_srirrama@...cinc.com; jiconglu58@...il.com; johannes.berg@...el.com;
> linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] rtlwifi: rtl8192ce: fix dealing empty eeprom values
> 
> In some cases, eeprom is empty or partly empty.

This looks weird to me. Why does hardware could be programmed improper eeprom?
Where do you get the hardware? Can I have a picture of this module privately?
I think we only need to support MP hardware.

> Load default values when the eeprom values are empty to avoid problems.
> 
> Signed-off-by: Lu jicong <jiconglu58@...il.com>
> ---
>  .../wireless/realtek/rtlwifi/rtl8192ce/hw.c   | 31 +++++++++++++------
>  1 file changed, 21 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/hw.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/hw.c
> index b9c62640d2cb..8ddf0017af4c 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/hw.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ce/hw.c
> @@ -1428,7 +1428,9 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
> 
>  	for (rf_path = 0; rf_path < 2; rf_path++) {
>  		for (i = 0; i < 3; i++) {
> -			if (!autoload_fail) {
> +			if (!autoload_fail &&
> +			    hwinfo[EEPROM_TXPOWERCCK + rf_path * 3 + i] != 0xff &&
> +			    hwinfo[EEPROM_TXPOWERHT40_1S + rf_path * 3 + i] != 0xff) {
>  				rtlefuse->
>  				    eeprom_chnlarea_txpwr_cck[rf_path][i] =
>  				    hwinfo[EEPROM_TXPOWERCCK + rf_path * 3 + i];
> @@ -1448,7 +1450,8 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
>  	}
> 
>  	for (i = 0; i < 3; i++) {
> -		if (!autoload_fail)
> +		if (!autoload_fail &&
> +		    hwinfo[EEPROM_TXPOWERHT40_2SDIFF + i] != 0xff)
>  			tempval = hwinfo[EEPROM_TXPOWERHT40_2SDIFF + i];
>  		else
>  			tempval = EEPROM_DEFAULT_HT40_2SDIFF;
> @@ -1518,7 +1521,9 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
>  	}
> 
>  	for (i = 0; i < 3; i++) {
> -		if (!autoload_fail) {
> +		if (!autoload_fail &&
> +		    hwinfo[EEPROM_TXPWR_GROUP + i] != 0xff &&
> +		    hwinfo[EEPROM_TXPWR_GROUP + 3 + i] != 0xff) {
>  			rtlefuse->eeprom_pwrlimit_ht40[i] =
>  			    hwinfo[EEPROM_TXPWR_GROUP + i];
>  			rtlefuse->eeprom_pwrlimit_ht20[i] =
> @@ -1563,7 +1568,8 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
>  	for (i = 0; i < 14; i++) {
>  		index = rtl92c_get_chnl_group((u8)i);
> 
> -		if (!autoload_fail)
> +		if (!autoload_fail &&
> +		    hwinfo[EEPROM_TXPOWERHT20DIFF + index] != 0xff)
>  			tempval = hwinfo[EEPROM_TXPOWERHT20DIFF + index];
>  		else
>  			tempval = EEPROM_DEFAULT_HT20_DIFF;
> @@ -1580,7 +1586,8 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
> 
>  		index = rtl92c_get_chnl_group((u8)i);
> 
> -		if (!autoload_fail)
> +		if (!autoload_fail &&
> +		    hwinfo[EEPROM_TXPOWER_OFDMDIFF + index] != 0xff)
>  			tempval = hwinfo[EEPROM_TXPOWER_OFDMDIFF + index];
>  		else
>  			tempval = EEPROM_DEFAULT_LEGACYHTTXPOWERDIFF;
> @@ -1610,14 +1617,16 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
>  			"RF-B Legacy to HT40 Diff[%d] = 0x%x\n",
>  			i, rtlefuse->txpwr_legacyhtdiff[RF90_PATH_B][i]);
> 
> -	if (!autoload_fail)
> +	if (!autoload_fail && hwinfo[RF_OPTION1] != 0xff)
>  		rtlefuse->eeprom_regulatory = (hwinfo[RF_OPTION1] & 0x7);
>  	else
>  		rtlefuse->eeprom_regulatory = 0;
>  	RTPRINT(rtlpriv, FINIT, INIT_TXPOWER,
>  		"eeprom_regulatory = 0x%x\n", rtlefuse->eeprom_regulatory);
> 
> -	if (!autoload_fail) {
> +	if (!autoload_fail &&
> +	    hwinfo[EEPROM_TSSI_A] != 0xff &&
> +	    hwinfo[EEPROM_TSSI_B] != 0xff) {
>  		rtlefuse->eeprom_tssi[RF90_PATH_A] = hwinfo[EEPROM_TSSI_A];
>  		rtlefuse->eeprom_tssi[RF90_PATH_B] = hwinfo[EEPROM_TSSI_B];
>  	} else {
> @@ -1628,7 +1637,7 @@ static void _rtl92ce_read_txpower_info_from_hwpg(struct ieee80211_hw *hw,
>  		rtlefuse->eeprom_tssi[RF90_PATH_A],
>  		rtlefuse->eeprom_tssi[RF90_PATH_B]);
> 
> -	if (!autoload_fail)
> +	if (!autoload_fail && hwinfo[EEPROM_THERMAL_METER] != 0xff)
>  		tempval = hwinfo[EEPROM_THERMAL_METER];
>  	else
>  		tempval = EEPROM_DEFAULT_THERMALMETER;
> --
> 2.30.2