wifi: rtw89: debug: txpwr_table considers sign

Previously, value of each field is just shown as unsigned.
Now, we start to show them with sign to make things more intuitive
during debugging.
Signed-off-by: NZong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: NPing-Ke Shih <pkshih@realtek.com>
Signed-off-by: NKalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220928084336.34981-6-pkshih@realtek.com

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

@@ -464,7 +464,7 @@ static const struct txpwr_map __txpwr_map_lmt_ru = {
 };
 
 static u8 __print_txpwr_ent(struct seq_file *m, const struct txpwr_ent *ent,
-			    const u8 *buf, const u8 cur)
+			    const s8 *buf, const u8 cur)
 {
 	char *fmt;
 
@@ -493,8 +493,9 @@ static int __print_txpwr_map(struct seq_file *m, struct rtw89_dev *rtwdev,
 			     const struct txpwr_map *map)
 {
 	u8 fct = rtwdev->chip->txpwr_factor_mac;
-	u8 *buf, cur, i;
 	u32 val, addr;
+	s8 *buf, tmp;
+	u8 cur, i;
 	int ret;
 
 	buf = vzalloc(map->addr_to - map->addr_from + 4);
@@ -507,8 +508,11 @@ static int __print_txpwr_map(struct seq_file *m, struct rtw89_dev *rtwdev,
 			val = MASKDWORD;
 
 		cur = addr - map->addr_from;
-		for (i = 0; i < 4; i++, val >>= 8)
-			buf[cur + i] = FIELD_GET(MASKBYTE0, val) >> fct;
+		for (i = 0; i < 4; i++, val >>= 8) {
+			/* signed 7 bits, and reserved BIT(7) */
+			tmp = sign_extend32(val, 6);
+			buf[cur + i] = tmp >> fct;
+		}
 	}
 
 	for (cur = 0, i = 0; i < map->size; i++)