diff --git a/sys/dev/rtwn/rtl8812a/r12a_chan.c b/sys/dev/rtwn/rtl8812a/r12a_chan.c
--- a/sys/dev/rtwn/rtl8812a/r12a_chan.c
+++ b/sys/dev/rtwn/rtl8812a/r12a_chan.c
@@ -180,6 +180,36 @@
 	    SM(R12A_TXAGC_OFDM54, power[RTWN_RIDX_OFDM54]));
 }
 
+static void
+r12a_tx_power_training(struct rtwn_softc *sc, int chain,
+    const struct ieee80211_channel *c, uint8_t power[RTWN_RIDX_COUNT])
+{
+	uint32_t write_data;
+	int32_t power_level;
+	int i;
+
+	write_data = 0;
+
+	power_level = (int32_t) power[RTWN_RIDX_HT_MCS(7)];
+	for (i = 0; i < 3; i++) {
+		if (i == 0)
+			power_level -= 10;
+		else if (i == 1)
+			power_level -= 8;
+		else
+			power_level -= 6;
+
+		/* Handle underflow and the minimum value (2) */
+		if (power_level < 2)
+			power_level = 2;
+
+		write_data |= ((power_level & 0xff) << (i * 8));
+	}
+
+	rtwn_bb_setbits(sc, R12A_TX_PWR_TRAINING(chain),
+	    0x00ffffff, write_data);
+}
+
 static void
 r12a_write_txpower(struct rtwn_softc *sc, int chain,
     struct ieee80211_channel *c, uint8_t power[RTWN_RIDX_COUNT])
@@ -189,6 +219,8 @@
 	r12a_write_txpower_ofdm(sc, chain, c, power);
 	r12a_write_txpower_ht(sc, chain, c, power);
 	r12a_write_txpower_vht(sc, chain, c, power);
+
+	r12a_tx_power_training(sc, chain, c, power);
 }
 
 static int
diff --git a/sys/dev/rtwn/rtl8812a/r12a_reg.h b/sys/dev/rtwn/rtl8812a/r12a_reg.h
--- a/sys/dev/rtwn/rtl8812a/r12a_reg.h
+++ b/sys/dev/rtwn/rtl8812a/r12a_reg.h
@@ -124,6 +124,7 @@
 #define R12A_TXAGC_NSS2IX5_2IX2(chain)	(0xc48 + (chain) * 0x200)
 #define R12A_TXAGC_NSS2IX9_2IX6(chain)	(0xc4c + (chain) * 0x200)
 #define R12A_INITIAL_GAIN(chain)	(0xc50 + (chain) * 0x200)
+#define R12A_TX_PWR_TRAINING(chain)	(0xc54 + (chain) * 0x200)
 #define R12A_AFE_POWER_1(chain)		(0xc60 + (chain) * 0x200)
 #define R12A_AFE_POWER_2(chain)		(0xc64 + (chain) * 0x200)
 #define R12A_SLEEP_NAV(chain)		(0xc80 + (chain) * 0x200)