linux-kernel - [RFC] [PATCH net-next v5 2/3] r8169: Use PCIe ASPM status for NIC ASPM enablement

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Message-Id: <20210916154417.664323-3-kai.heng.feng@canonical.com>
Date:   Thu, 16 Sep 2021 23:44:16 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     hkallweit1@...il.com, nic_swsd@...ltek.com, bhelgaas@...gle.com
Cc:     davem@...emloft.net, kuba@...nel.org, anthony.wong@...onical.com,
        netdev@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [RFC] [PATCH net-next v5 2/3] r8169: Use PCIe ASPM status for NIC ASPM enablement

Because ASPM control may not be granted by BIOS while ASPM is enabled,
and ASPM can be enabled via sysfs, so use pcie_aspm_enabled() directly
to check current ASPM enable status.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v5:
 - New patch.

 drivers/net/ethernet/realtek/r8169_main.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 0199914440abc..6f1a9bec40c05 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -622,7 +622,6 @@ struct rtl8169_private {
 	} wk;
 
 	unsigned supports_gmii:1;
-	unsigned aspm_manageable:1;
 	dma_addr_t counters_phys_addr;
 	struct rtl8169_counters *counters;
 	struct rtl8169_tc_offsets tc_offset;
@@ -2664,8 +2663,13 @@ static void rtl_enable_exit_l1(struct rtl8169_private *tp)
 
 static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
 {
-	/* Don't enable ASPM in the chip if OS can't control ASPM */
-	if (enable && tp->aspm_manageable) {
+	struct pci_dev *pdev = tp->pci_dev;
+
+	/* Don't enable ASPM in the chip if PCIe ASPM isn't enabled */
+	if (!pcie_aspm_enabled(pdev) && enable)
+		return;
+
+	if (enable) {
 		RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
 		RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
 	} else {
@@ -5272,8 +5276,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Disable ASPM L1 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_L1);
-	tp->aspm_manageable = !rc;
+	pci_disable_link_state(pdev, PCIE_LINK_STATE_L1);
 
 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
 	rc = pcim_enable_device(pdev);
-- 
2.32.0