netdev - [PATCH 2/2] r8169: Enable ASPM for selected NICs

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Date:   Tue,  3 Aug 2021 23:28:23 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     hkallweit1@...il.com, nic_swsd@...ltek.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org (open list:8169 10/100/1000 GIGABIT ETHERNET
        DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] r8169: Enable ASPM for selected NICs

The latest vendor driver enables ASPM for more recent r8168 NICs, do the
same here to match the behavior.

In addition, pci_disable_link_state() is only used for RTL8168D/8111D in
vendor driver, also match that.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 34 +++++++++++++++++------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index e257d3cd885e..ec09c13514bd 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -623,7 +623,7 @@ struct rtl8169_private {
 	} wk;
 
 	unsigned supports_gmii:1;
-	unsigned aspm_manageable:1;
+	unsigned aspm_supported:1;
 	unsigned aspm_enabled:1;
 	struct timer_list aspm_timer;
 	u32 aspm_packet_count;
@@ -2666,8 +2666,11 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp)
 
 static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
 {
+	if (!tp->aspm_supported)
+		return;
+
 	/* Don't enable ASPM in the chip if OS can't control ASPM */
-	if (enable && tp->aspm_manageable) {
+	if (enable) {
 		RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
 		RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
 	} else {
@@ -5279,6 +5282,21 @@ static void rtl_init_mac_address(struct rtl8169_private *tp)
 	rtl_rar_set(tp, mac_addr);
 }
 
+static int rtl_hw_aspm_supported(struct rtl8169_private *tp)
+{
+	switch (tp->mac_version) {
+	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_36:
+	case RTL_GIGA_MAC_VER_38:
+	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_42:
+	case RTL_GIGA_MAC_VER_44 ... RTL_GIGA_MAC_VER_46:
+	case RTL_GIGA_MAC_VER_49 ... RTL_GIGA_MAC_VER_63:
+		return 1;
+
+	default:
+		return 0;
+	}
+}
+
 static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct rtl8169_private *tp;
@@ -5310,12 +5328,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc)
 		return rc;
 
-	/* Disable ASPM completely as that cause random device stop working
-	 * problems as well as full system hangs for some PCIe devices users.
-	 */
-	rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
-					  PCIE_LINK_STATE_L1);
-	tp->aspm_manageable = !rc;
+	if (tp->mac_version == RTL_GIGA_MAC_VER_25)
+		pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
+				       PCIE_LINK_STATE_L1 |
+				       PCIE_LINK_STATE_CLKPM);
+
+	tp->aspm_supported = rtl_hw_aspm_supported(tp);
 
 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
 	rc = pcim_enable_device(pdev);
-- 
2.31.1