rtl8xxxu: Match 8723bu power down sequence to vendor driver

In particular set APS_FSMCO_WLON_RESET in the right register, and do
not overwrite too much of REG_CR.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c

@@ -6510,9 +6510,9 @@ static int rtl8723bu_active_to_emu(struct rtl8xxxu_priv *priv)
 	rtl8xxxu_write16(priv, REG_GPIO_INTM, val16);
 
 	/* Release WLON reset 0x04[16]= 1*/
-	val32 = rtl8xxxu_read32(priv, REG_GPIO_INTM);
+	val32 = rtl8xxxu_read32(priv, REG_APS_FSMCO);
 	val32 |= APS_FSMCO_WLON_RESET;
-	rtl8xxxu_write32(priv, REG_GPIO_INTM, val32);
+	rtl8xxxu_write32(priv, REG_APS_FSMCO, val32);
 
 	/* 0x0005[1] = 1 turn off MAC by HW state machine*/
 	val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 1);
@@ -7376,7 +7376,7 @@ static void rtl8723bu_power_off(struct rtl8xxxu_priv *priv)
 	val8 &= ~TX_REPORT_CTRL_TIMER_ENABLE;
 	rtl8xxxu_write8(priv, REG_TX_REPORT_CTRL, val8);
 
-	rtl8xxxu_write16(priv, REG_CR, 0x0000);
+	rtl8xxxu_write8(priv, REG_CR, 0x0000);
 
 	rtl8xxxu_active_to_lps(priv);
 
@@ -7393,7 +7393,15 @@ static void rtl8723bu_power_off(struct rtl8xxxu_priv *priv)
 	rtl8xxxu_write8(priv, REG_MCU_FW_DL, 0x00);
 
 	rtl8723bu_active_to_emu(priv);
-	rtl8xxxu_emu_to_disabled(priv);
+
+	val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 1);
+	val8 |= BIT(3); /* APS_FSMCO_HW_SUSPEND */
+	rtl8xxxu_write8(priv, REG_APS_FSMCO + 1, val8);
+
+	/* 0x48[16] = 1 to enable GPIO9 as EXT wakeup */
+	val8 = rtl8xxxu_read8(priv, REG_GPIO_INTM + 2);
+	val8 |= BIT(0);
+	rtl8xxxu_write8(priv, REG_GPIO_INTM + 2, val8);
 }
 
 #ifdef NEED_PS_TDMA