[PATCH 3/3 V2][SRU][U] UBUNTU: SAUCE: r8169: Use PHY_POLL when RTL8106E enable ASPM

[Koba Ko]

BugLink: https://bugs.launchpad.net/bugs/1930645

For RTL8106E, it's a Fast-ethernet chip.
If ASPM is enabled, the link chang interrupt wouldn't be triggered
immediately and must wait a very long time to get link change interrupt.
Even the link change interrupt isn't triggered, the phy link is already
established.

Use PHY_POLL to watch the status of phy link
when ASPM is enabled on RTL8106E.

Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 88ff10fde853..b3c88ad943b1 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2246,6 +2246,19 @@ static int rtl_set_mac_address(struct net_device *dev, void *p)
 	return 0;
 }
 
+static int rtl_phy_poll_quirk(struct rtl8169_private *tp)
+{
+	struct pci_dev *pdev = tp->pci_dev;
+
+	if (!pcie_aspm_enabled(pdev))
+		return 0;
+
+	if (tp->mac_version == RTL_GIGA_MAC_VER_39)
+		return 1;
+
+	return 0;
+}
+
 static void rtl_wol_enable_rx(struct rtl8169_private *tp)
 {
 	if (tp->mac_version >= RTL_GIGA_MAC_VER_25)
@@ -5085,7 +5098,8 @@ static int r8169_mdio_register(struct rtl8169_private *tp)
 	new_bus->name = "r8169";
 	new_bus->priv = tp;
 	new_bus->parent = &pdev->dev;
-	new_bus->irq[0] = PHY_MAC_INTERRUPT;
+	new_bus->irq[0] =
+		(rtl_phy_poll_quirk(tp) ? PHY_POLL : PHY_MAC_INTERRUPT);
 	snprintf(new_bus->id, MII_BUS_ID_SIZE, "r8169-%x", pci_dev_id(pdev));
 
 	new_bus->read = r8169_mdio_read_reg;
-- 
2.25.1