rtl8xxxu: Provide special handling when writing RF regs on 8192eu

The 8192eu requires clearing/restoring bit 17 in REG_FPGA0_POWER_SAVE
before/after writing RF registers.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -1896,7 +1896,7 @@ static int rtl8xxxu_write_rfreg(struct rtl8xxxu_priv *priv,
 				enum rtl8xxxu_rfpath path, u8 reg, u32 data)
 {
 	int ret, retval;
-	u32 dataaddr;
+	u32 dataaddr, val32;
 
 	if (rtl8xxxu_debug & RTL8XXXU_DEBUG_RFREG_WRITE)
 		dev_info(&priv->udev->dev, "%s(%02x) = 0x%06x\n",
@@ -1905,6 +1905,12 @@ static int rtl8xxxu_write_rfreg(struct rtl8xxxu_priv *priv,
 	data &= FPGA0_LSSI_PARM_DATA_MASK;
 	dataaddr = (reg << FPGA0_LSSI_PARM_ADDR_SHIFT) | data;
 
+	if (priv->rtl_chip == RTL8192E) {
+		val32 = rtl8xxxu_read32(priv, REG_FPGA0_POWER_SAVE);
+		val32 &= ~0x20000;
+		rtl8xxxu_write32(priv, REG_FPGA0_POWER_SAVE, val32);
+	}
+
 	/* Use XB for path B */
 	ret = rtl8xxxu_write32(priv, rtl8xxxu_rfregs[path].lssiparm, dataaddr);
 	if (ret != sizeof(dataaddr))
@@ -1914,6 +1920,12 @@ static int rtl8xxxu_write_rfreg(struct rtl8xxxu_priv *priv,
 
 	udelay(1);
 
+	if (priv->rtl_chip == RTL8192E) {
+		val32 = rtl8xxxu_read32(priv, REG_FPGA0_POWER_SAVE);
+		val32 |= 0x20000;
+		rtl8xxxu_write32(priv, REG_FPGA0_POWER_SAVE, val32);
+	}
+
 	return retval;
 }