linux-kernel - [PATCH v2] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to Intel PCI bridge

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Date:   Mon, 13 Nov 2023 12:34:55 +0800
From:   Jian-Hong Pan <jhp@...lessos.org>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Ping-Ke Shih <pkshih@...ltek.com>
Cc:     Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...lessos.org,
        Jian-Hong Pan <jhp@...lessos.org>
Subject: [PATCH v2] rtlwifi: rtl8723be: Disable ASPM if RTL8723BE connects to Intel PCI bridge

Disable rtl8723be's ASPM if the Realtek RTL8723BE PCIe Wireless adapter
connects to some Intel PCI bridges, such as Skylake and Kabylake.
Otherwise, the PCI AER flood hangs system:

pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
pcieport 0000:00:1c.5:   device [8086:9d15] error status/mask=00000001/00002000
pcieport 0000:00:1c.5:    [ 0] RxErr                  (First)
pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
pcieport 0000:00:1c.5: AER: can't find device of ID00e5
pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
pcieport 0000:00:1c.5: AER: can't find device of ID00e5
pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
pcieport 0000:00:1c.5: AER: can't find device of ID00e5

Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=218127
Signed-off-by: Jian-Hong Pan <jhp@...lessos.org>
---
v2: Add the switch case's default condition with comment:
    "The ASPM has already been enabled by initializing
    rtl8723be_mod_params' aspm_support as 1."

 .../wireless/realtek/rtlwifi/rtl8723be/sw.c   | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
index 43b611d5288d..b20c0b9d8393 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723be/sw.c
@@ -25,10 +25,34 @@ static void rtl8723be_init_aspm_vars(struct ieee80211_hw *hw)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
+	struct pci_dev *bridge_pdev;
 
 	/*close ASPM for AMD defaultly */
 	rtlpci->const_amdpci_aspm = 0;
 
+	/* Disable ASPM if RTL8723BE connects to some Intel PCI bridges, such as
+	 * Skylake and Kabylake. Otherwise, the PCI AER flood hangs system.
+	 */
+	bridge_pdev = rtlpci->pdev->bus->self;
+	if (bridge_pdev->vendor == PCI_VENDOR_ID_INTEL) {
+		switch(bridge_pdev->device) {
+		case 0x9d15:
+		/* PCI bridges on Skylake */
+		case 0xa110 ... 0xa11f:
+		case 0xa167 ... 0xa16a:
+		/* PCI bridges on Kabylake */
+		case 0xa290 ... 0xa29f:
+		case 0xa2e7 ... 0xa2ee:
+			rtlpriv->cfg->mod_params->aspm_support = 0;
+			break;
+		default:
+			/* The ASPM has already been enabled by initializing
+			 * rtl8723be_mod_params' aspm_support as 1.
+			 */
+			break;
+		}
+	}
+
 	/* ASPM PS mode.
 	 * 0 - Disable ASPM,
 	 * 1 - Enable ASPM without Clock Req,
-- 
2.42.1