r8169: enable ALDPS for power saving

Enable ALDPS function to save power when link down. Note that the
feature should be set after the other PHY settings. And the firmware
is necessary. Don't enable it without loading the firmware.

None of the firmware-free chipsets support ALDPS. Neither do the
RTL8168d/8111d.

For 8136 series, make sure the ALDPS is disabled before loading the
firmware. For 8168 series, the ALDPS would be disabled automatically
when loading firmware. You must not disable it directly.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169.c

@@ -687,6 +687,7 @@ enum features {
 	RTL_FEATURE_WOL		= (1 << 0),
 	RTL_FEATURE_MSI		= (1 << 1),
 	RTL_FEATURE_GMII	= (1 << 2),
+	RTL_FEATURE_FW_LOADED	= (1 << 3),
 };
 
 struct rtl8169_counters {
@@ -2394,8 +2395,10 @@ static void rtl_apply_firmware(struct rtl8169_private *tp)
 	struct rtl_fw *rtl_fw = tp->rtl_fw;
 
 	/* TODO: release firmware once rtl_phy_write_fw signals failures. */
-	if (!IS_ERR_OR_NULL(rtl_fw))
+	if (!IS_ERR_OR_NULL(rtl_fw)) {
 		rtl_phy_write_fw(tp, rtl_fw);
+		tp->features |= RTL_FEATURE_FW_LOADED;
+	}
 }
 
 static void rtl_apply_firmware_cond(struct rtl8169_private *tp, u8 reg, u16 val)
@@ -2406,6 +2409,31 @@ static void rtl_apply_firmware_cond(struct rtl8169_private *tp, u8 reg, u16 val)
 		rtl_apply_firmware(tp);
 }
 
+static void r810x_aldps_disable(struct rtl8169_private *tp)
+{
+	rtl_writephy(tp, 0x1f, 0x0000);
+	rtl_writephy(tp, 0x18, 0x0310);
+	msleep(100);
+}
+
+static void r810x_aldps_enable(struct rtl8169_private *tp)
+{
+	if (!(tp->features & RTL_FEATURE_FW_LOADED))
+		return;
+
+	rtl_writephy(tp, 0x1f, 0x0000);
+	rtl_writephy(tp, 0x18, 0x8310);
+}
+
+static void r8168_aldps_enable_1(struct rtl8169_private *tp)
+{
+	if (!(tp->features & RTL_FEATURE_FW_LOADED))
+		return;
+
+	rtl_writephy(tp, 0x1f, 0x0000);
+	rtl_w1w0_phy(tp, 0x15, 0x1000, 0x0000);
+}
+
 static void rtl8169s_hw_phy_config(struct rtl8169_private *tp)
 {
 	static const struct phy_reg phy_reg_init[] = {
@@ -3178,6 +3206,8 @@ static void rtl8168e_2_hw_phy_config(struct rtl8169_private *tp)
 	rtl_w1w0_phy(tp, 0x19, 0x0000, 0x0001);
 	rtl_w1w0_phy(tp, 0x10, 0x0000, 0x0400);
 	rtl_writephy(tp, 0x1f, 0x0000);
+
+	r8168_aldps_enable_1(tp);
 }
 
 static void rtl8168f_hw_phy_config(struct rtl8169_private *tp)
@@ -3250,6 +3280,8 @@ static void rtl8168f_1_hw_phy_config(struct rtl8169_private *tp)
 	rtl_writephy(tp, 0x05, 0x8b85);
 	rtl_w1w0_phy(tp, 0x06, 0x4000, 0x0000);
 	rtl_writephy(tp, 0x1f, 0x0000);
+
+	r8168_aldps_enable_1(tp);
 }
 
 static void rtl8168f_2_hw_phy_config(struct rtl8169_private *tp)
@@ -3257,6 +3289,8 @@ static void rtl8168f_2_hw_phy_config(struct rtl8169_private *tp)
 	rtl_apply_firmware(tp);
 
 	rtl8168f_hw_phy_config(tp);
+
+	r8168_aldps_enable_1(tp);
 }
 
 static void rtl8411_hw_phy_config(struct rtl8169_private *tp)
@@ -3354,6 +3388,8 @@ static void rtl8411_hw_phy_config(struct rtl8169_private *tp)
 	rtl_w1w0_phy(tp, 0x19, 0x0000, 0x0001);
 	rtl_w1w0_phy(tp, 0x10, 0x0000, 0x0400);
 	rtl_writephy(tp, 0x1f, 0x0000);
+
+	r8168_aldps_enable_1(tp);
 }
 
 static void rtl8168g_1_hw_phy_config(struct rtl8169_private *tp)
@@ -3439,21 +3475,19 @@ static void rtl8105e_hw_phy_config(struct rtl8169_private *tp)
 	};
 
 	/* Disable ALDPS before ram code */
-	rtl_writephy(tp, 0x1f, 0x0000);
-	rtl_writephy(tp, 0x18, 0x0310);
-	msleep(100);
+	r810x_aldps_disable(tp);
 
 	rtl_apply_firmware(tp);
 
 	rtl_writephy_batch(tp, phy_reg_init, ARRAY_SIZE(phy_reg_init));
+
+	r810x_aldps_enable(tp);
 }
 
 static void rtl8402_hw_phy_config(struct rtl8169_private *tp)
 {
 	/* Disable ALDPS before setting firmware */
-	rtl_writephy(tp, 0x1f, 0x0000);
-	rtl_writephy(tp, 0x18, 0x0310);
-	msleep(20);
+	r810x_aldps_disable(tp);
 
 	rtl_apply_firmware(tp);
 
@@ -3463,6 +3497,8 @@ static void rtl8402_hw_phy_config(struct rtl8169_private *tp)
 	rtl_writephy(tp, 0x10, 0x401f);
 	rtl_writephy(tp, 0x19, 0x7030);
 	rtl_writephy(tp, 0x1f, 0x0000);
+
+	r810x_aldps_enable(tp);
 }
 
 static void rtl8106e_hw_phy_config(struct rtl8169_private *tp)
@@ -3475,9 +3511,7 @@ static void rtl8106e_hw_phy_config(struct rtl8169_private *tp)
 	};
 
 	/* Disable ALDPS before ram code */
-	rtl_writephy(tp, 0x1f, 0x0000);
-	rtl_writephy(tp, 0x18, 0x0310);
-	msleep(100);
+	r810x_aldps_disable(tp);
 
 	rtl_apply_firmware(tp);
 
@@ -3485,6 +3519,8 @@ static void rtl8106e_hw_phy_config(struct rtl8169_private *tp)
 	rtl_writephy_batch(tp, phy_reg_init, ARRAY_SIZE(phy_reg_init));
 
 	rtl_eri_write(tp, 0x1d0, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
+
+	r810x_aldps_enable(tp);
 }
 
 static void rtl_hw_phy_config(struct net_device *dev)