wifi: rtw89: correct hardware value of nominal packet padding for WiFi 7 chips

The hardware value of 3 for WiFi 7 chips is padding 16 or 20us selected
by hardware automatically. Correct the value to resolve interoperability
problem. Also define enum to be more readable.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240517013639.11643-1-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.h

@@ -884,6 +884,13 @@ enum rtw89_ps_mode {
 #define RTW89_BYR_BW_NUM (RTW89_CHANNEL_WIDTH_320 + 1)
 #define RTW89_PPE_BW_NUM (RTW89_CHANNEL_WIDTH_320 + 1)
 
+enum rtw89_pe_duration {
+	RTW89_PE_DURATION_0 = 0,
+	RTW89_PE_DURATION_8 = 1,
+	RTW89_PE_DURATION_16 = 2,
+	RTW89_PE_DURATION_16_20 = 3,
+};
+
 enum rtw89_ru_bandwidth {
 	RTW89_RU26 = 0,
 	RTW89_RU52 = 1,

drivers/net/wireless/realtek/rtw89/fw.c

@@ -2752,11 +2752,11 @@ static void __get_sta_he_pkt_padding(struct rtw89_dev *rtwdev,
 		ppe8 = (ppe >> sh) & IEEE80211_PPE_THRES_NSS_MASK;
 
 		if (ppe16 != 7 && ppe8 == 7)
-			pads[i] = 2;
+			pads[i] = RTW89_PE_DURATION_16;
 		else if (ppe8 != 7)
-			pads[i] = 1;
+			pads[i] = RTW89_PE_DURATION_8;
 		else
-			pads[i] = 0;
+			pads[i] = RTW89_PE_DURATION_0;
 	}
 }
 
@@ -2889,11 +2889,11 @@ static void __get_sta_eht_pkt_padding(struct rtw89_dev *rtwdev,
 		ppe8 = (ppe >> sh) & IEEE80211_PPE_THRES_NSS_MASK;
 
 		if (ppe16 != 7 && ppe8 == 7)
-			pads[i] = 2;
+			pads[i] = RTW89_PE_DURATION_16_20;
 		else if (ppe8 != 7)
-			pads[i] = 1;
+			pads[i] = RTW89_PE_DURATION_8;
 		else
-			pads[i] = 0;
+			pads[i] = RTW89_PE_DURATION_0;
 	}
 }