rtl8xxxu: Do not set REG_AFE_XTAL_CTRL on 8723bu

The 8723bu does not like REG_AFE_XTAL_CTRL being set, so skip this for
now, to match the vendor driver.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -2998,6 +2998,7 @@ static int rtl8xxxu_init_phy_regs(struct rtl8xxxu_priv *priv,
 static int rtl8xxxu_init_phy_bb(struct rtl8xxxu_priv *priv)
 {
 	u8 val8, ldoa15, ldov12d, lpldo, ldohci12;
+	u16 val16;
 	u32 val32;
 
 	/*
@@ -3018,16 +3019,18 @@ static int rtl8xxxu_init_phy_bb(struct rtl8xxxu_priv *priv)
 		udelay(2);
 	}
 
-	val8 = rtl8xxxu_read8(priv, REG_SYS_FUNC);
-	val8 |= SYS_FUNC_BB_GLB_RSTN | SYS_FUNC_BBRSTB;
-	rtl8xxxu_write8(priv, REG_SYS_FUNC, val8);
+	val16 = rtl8xxxu_read16(priv, REG_SYS_FUNC);
+	val16 |= SYS_FUNC_BB_GLB_RSTN | SYS_FUNC_BBRSTB;
+	rtl8xxxu_write16(priv, REG_SYS_FUNC, val16);
 
+	if (priv->rtlchip != 0x8723b) {
 		/* AFE_XTAL_RF_GATE (bit 14) if addressing as 32 bit register */
 		val32 = rtl8xxxu_read32(priv, REG_AFE_XTAL_CTRL);
 		val32 &= ~AFE_XTAL_RF_GATE;
 		if (priv->has_bluetooth)
 			val32 &= ~AFE_XTAL_BT_GATE;
 		rtl8xxxu_write32(priv, REG_AFE_XTAL_CTRL, val32);
+	}
 
 	/* 6. 0x1f[7:0] = 0x07 */
 	val8 = RF_ENABLE | RF_RSTB | RF_SDMRSTB;