linux-kernel - [PATCH V2] wifi: rtlwifi: rtl8192ce: fix dealing empty EEPROM values

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Date:   Tue, 14 Feb 2023 06:36:02 +0000
From:   Lu jicong <jiconglu58@...il.com>
To:     pkshih@...ltek.com, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lu jicong <jiconglu58@...il.com>
Subject: [PATCH V2] wifi: rtlwifi: rtl8192ce: fix dealing empty EEPROM values

On OpenWRT platform, RTL8192CE could be soldered on board, but not standard PCI
module. In this case, some EEPROM values aren't programmed and left 0xff.
Load default values when the EEPROM values are empty to avoid problems.

Signed-off-by: Lu jicong <jiconglu58@...il.com>
---
v2: add more detailed commit message
---
 .../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