netdev - [PATCH] r8169: only disable ASPM L1.1 support, instead of disabling them all

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Message-Id: <20200318014548.14547-1-acelan.kao@canonical.com>
Date:   Wed, 18 Mar 2020 09:45:48 +0800
From:   AceLan Kao <acelan.kao@...onical.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] r8169: only disable ASPM L1.1 support, instead of disabling them all

The issues which have been seen by enabling ASPM support are from the
BIOS that enables the ASPM L1.1 support on the device. It leads to some
strange behaviors when the device enter L1.1 state.
So, we don't have to disable ASPM support entriely, just disable L1.1
state, that fixes the issues and also has good power management.

Signed-off-by: AceLan Kao <acelan.kao@...onical.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index a2168a14794c..b52680e7323b 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5473,11 +5473,10 @@ 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.
+	/* r8169 suppots ASPM L0 and L1 well, and doesn't support L1.1,
+	 * so disable ASPM L1.1 only.
 	 */
-	rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
-					  PCIE_LINK_STATE_L1);
+	rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L1_1);
 	tp->aspm_manageable = !rc;
 
 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
-- 
2.17.1