r8169: improve handling D3 PLL power-down

Realtek provided a description of bits 6 and 7 in register PMCH.
They configure whether the chip powers down certain PLL in D3hot and
D3cold respectively. They do not actually power down the PLL.
Reflect this in the code and configure D3 PLL powerdown based on
whether WOL is enabled.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/realtek/r8169_main.c

@@ -261,6 +261,9 @@ enum rtl8168_8101_registers {
 #define	CSIAR_BYTE_ENABLE		0x0000f000
 #define	CSIAR_ADDR_MASK			0x00000fff
 	PMCH			= 0x6f,
+#define D3COLD_NO_PLL_DOWN		BIT(7)
+#define D3HOT_NO_PLL_DOWN		BIT(6)
+#define D3_NO_PLL_DOWN			(BIT(7) | BIT(6))
 	EPHYAR			= 0x80,
 #define	EPHYAR_FLAG			0x80000000
 #define	EPHYAR_WRITE_CMD		0x80000000
@@ -1250,6 +1253,22 @@ static bool r8168_check_dash(struct rtl8169_private *tp)
 	}
 }
 
+static void rtl_set_d3_pll_down(struct rtl8169_private *tp, bool enable)
+{
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_25 ... RTL_GIGA_MAC_VER_26:
+	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_37:
+	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_63:
+		if (enable)
+			RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) & ~D3_NO_PLL_DOWN);
+		else
+			RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) | D3_NO_PLL_DOWN);
+		break;
+	default:
+		break;
+	}
+}
+
 static void rtl_reset_packet_filter(struct rtl8169_private *tp)
 {
 	rtl_eri_clear_bits(tp, 0xdc, BIT(0));
@@ -1416,6 +1435,7 @@ static void __rtl8169_set_wol(struct rtl8169_private *tp, u32 wolopts)
 	rtl_lock_config_regs(tp);
 
 	device_set_wakeup_enable(tp_to_dev(tp), wolopts);
+	rtl_set_d3_pll_down(tp, !wolopts);
 	tp->dev->wol_enabled = wolopts ? 1 : 0;
 }
 
@@ -2221,37 +2241,11 @@ static void rtl_pll_power_down(struct rtl8169_private *tp)
 	if (device_may_wakeup(tp_to_dev(tp))) {
 		phy_speed_down(tp->phydev, false);
 		rtl_wol_suspend_quirk(tp);
-		return;
-	}
-
-	switch (tp->mac_version) {
-	case RTL_GIGA_MAC_VER_25 ... RTL_GIGA_MAC_VER_26:
-	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_37:
-	case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_63:
-		RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) & ~0x80);
-		break;
-	default:
-		break;
 	}
 }
 
 static void rtl_pll_power_up(struct rtl8169_private *tp)
 {
-	switch (tp->mac_version) {
-	case RTL_GIGA_MAC_VER_25 ... RTL_GIGA_MAC_VER_26:
-	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_37:
-	case RTL_GIGA_MAC_VER_39:
-	case RTL_GIGA_MAC_VER_43:
-		RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) | 0x80);
-		break;
-	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_42:
-	case RTL_GIGA_MAC_VER_44 ... RTL_GIGA_MAC_VER_63:
-		RTL_W8(tp, PMCH, RTL_R8(tp, PMCH) | 0xc0);
-		break;
-	default:
-		break;
-	}
-
 	phy_resume(tp->phydev);
 }
 
@@ -5330,6 +5324,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* configure chip for default features */
 	rtl8169_set_features(dev, dev->features);
 
+	rtl_set_d3_pll_down(tp, true);
+
 	jumbo_max = rtl_jumbo_max(tp);
 	if (jumbo_max)
 		dev->max_mtu = jumbo_max;
@@ -5350,9 +5346,6 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc)
 		return rc;
 
-	/* chip gets powered up in rtl_open() */
-	rtl_pll_power_down(tp);
-
 	rc = register_netdev(dev);
 	if (rc)
 		return rc;