openwrtv4/package/kernel/mac80211/patches/653-0055-rtl8xxxu-Fix-reloading-of-driver-for-8188eu-devices.patch

From 7b4161933d0a409023f5ef70cdc9296ab1cf5430 Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Wed, 14 Sep 2016 14:10:42 -0400
Subject: [PATCH] rtl8xxxu: Fix reloading of driver for 8188eu devices

For 8188eu, once the MAC is asked to power down by setting
APS_FSMCO_MAC_OFF, there seems to be no way to bring it back to life.

In addition, only disable RF_ENABLE in RF_CTRL rather than all bits.

This was spotted by Andrea Merello who noticed that if we dropped the
call to rtl8188eu_active_to_emu() reloading started working.

Reported-by: Andrea Merello <andrea.merello@gmail.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 .../net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c | 29 +++++-----------------
 1 file changed, 6 insertions(+), 23 deletions(-)

--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
@@ -1160,37 +1160,18 @@ exit:
 static int rtl8188eu_active_to_emu(struct rtl8xxxu_priv *priv)
 {
 	u8 val8;
-	int count, ret = 0;
 
 	/* Turn off RF */
-	rtl8xxxu_write8(priv, REG_RF_CTRL, 0);
+	val8 = rtl8xxxu_read8(priv, REG_RF_CTRL);
+	val8 &= ~RF_ENABLE;
+	rtl8xxxu_write8(priv, REG_RF_CTRL, val8);
 
 	/* LDO Sleep mode */
 	val8 = rtl8xxxu_read8(priv, REG_LPLDO_CTRL);
 	val8 |= BIT(4);
 	rtl8xxxu_write8(priv, REG_LPLDO_CTRL, val8);
 
-	/* 0x0005[1] = 1 turn off MAC by HW state machine*/
-	val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 1);
-	val8 |= BIT(1);
-	rtl8xxxu_write8(priv, REG_APS_FSMCO + 1, val8);
-
-	for (count = RTL8XXXU_MAX_REG_POLL; count; count--) {
-		val8 = rtl8xxxu_read8(priv, REG_APS_FSMCO + 1);
-		if ((val8 & BIT(1)) == 0)
-			break;
-		udelay(10);
-	}
-
-	if (!count) {
-		dev_warn(&priv->udev->dev, "%s: Disabling MAC timed out\n",
-			 __func__);
-		ret = -EBUSY;
-		goto exit;
-	}
-
-exit:
-	return ret;
+	return 0;
 }
 
 static int rtl8188eu_emu_to_disabled(struct rtl8xxxu_priv *priv)
@@ -1372,6 +1353,8 @@ void rtl8188eu_power_off(struct rtl8xxxu
 
 static void rtl8188e_enable_rf(struct rtl8xxxu_priv *priv)
 {
+	rtl8xxxu_write8(priv, REG_RF_CTRL, RF_ENABLE | RF_RSTB | RF_SDMRSTB);
+
 	rtl8xxxu_write8(priv, REG_TXPAUSE, 0x00);
 }