linux-kernel - [PATCH] PCI/portdev: Disable AER for Titan Ridge 4C 2018

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Message-ID: <20260106182025.1398-1-atharvatiwarilinuxdev@gmail.com>
Date: Tue,  6 Jan 2026 18:20:17 +0000
From: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
To: 
Cc: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lukas Wunner <lukas@...ner.de>,
	Dave Jiang <dave.jiang@...el.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Feng Tang <feng.tang@...ux.alibaba.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] PCI/portdev: Disable AER for Titan Ridge 4C 2018

Disable AER for Intel Titan Ridge 4C 2018
(used in T2 iMacs, where the warnings appear)
that generates continuous pcieport warnings. such as:

pcieport 0000:00:1c.4: AER: Correctable error message received from 0000:07:00.0
pcieport 0000:07:00.0: PCIe Bus Error: severity=Correctable, type=Data Link Layer, (Receiver ID)
pcieport 0000:07:00.0:   device [8086:15ea] error status/mask=00000080/00002000
pcieport 0000:07:00.0:    [ 7] BadDLLP

(see: https://bugzilla.kernel.org/show_bug.cgi?id=220651)

macOS also disables AER for Thunderbolt devices and controllers in their drivers.

Signed-off-by: Atharva Tiwari <atharvatiwarilinuxdev@...il.com>
---
 drivers/pci/pcie/portdrv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/portdrv.c b/drivers/pci/pcie/portdrv.c
index 38a41ccf79b9..5330a679fcff 100644
--- a/drivers/pci/pcie/portdrv.c
+++ b/drivers/pci/pcie/portdrv.c
@@ -240,7 +240,9 @@ static int get_port_device_capability(struct pci_dev *dev)
 	if ((pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
              pci_pcie_type(dev) == PCI_EXP_TYPE_RC_EC) &&
 	    dev->aer_cap && pci_aer_available() &&
-	    (pcie_ports_native || host->native_aer))
+	    (pcie_ports_native || host->native_aer) &&
+	    !(dev->vendor == PCI_VENDOR_ID_INTEL &&
+		    (dev->device >= 0x15EA && dev->device <= 0x15EC)))
 		services |= PCIE_PORT_SERVICE_AER;
 #endif
 
-- 
2.43.0