linux-kernel - [PATCH 1/2] PCI/ASPM: Avoid L0s and L1 on Sophgo 2042 PCIe [1f1c:2042] Root Ports

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Message-ID: <20251225100530.1301625-2-inochiama@gmail.com>
Date: Thu, 25 Dec 2025 18:05:28 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...il.com>,
	Han Gao <rabenda.cn@...il.com>,
	Manivannan Sadhasivam <mani@...nel.org>
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yixun Lan <dlan@...too.org>,
	Longbin Li <looong.bin@...il.com>,
	Han Gao <gaohan@...as.ac.cn>
Subject: [PATCH 1/2] PCI/ASPM: Avoid L0s and L1 on Sophgo 2042 PCIe [1f1c:2042] Root Ports

Since commit f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM
states for devicetree platforms") force enable ASPM on all device tree
platform, the SG2042 root port breaks as it advertises L0s and L1
capabilities without supporting it.

Override the L0s and L1 Support advertised in Link Capabilities by the
SG2042 Root Ports ([1f1c:2042]), so we don't try to enable those states.

Fixes: 4e27aca4881a ("riscv: sophgo: dts: add PCIe controllers for SG2042")
Signed-off-by: Inochi Amaoto <inochiama@...il.com>
Tested-by: Han Gao <gaohan@...as.ac.cn>
---
 drivers/pci/quirks.c    | 1 +
 include/linux/pci_ids.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index b9c252aa6fe0..d775ff567d1b 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2526,6 +2526,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_disable_aspm_l0s_l
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, 0x0451, quirk_disable_aspm_l0s_l1);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_PASEMI, 0xa002, quirk_disable_aspm_l0s_l1);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0x1105, quirk_disable_aspm_l0s_l1);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SOPHGO, 0x2042, quirk_disable_aspm_l0s_l1);
 
 /*
  * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index a9a089566b7c..78638cbf2780 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2631,6 +2631,8 @@
 
 #define PCI_VENDOR_ID_CXL		0x1e98
 
+#define PCI_VENDOR_ID_SOPHGO		0x1f1c
+
 #define PCI_VENDOR_ID_TEHUTI		0x1fc9
 #define PCI_DEVICE_ID_TEHUTI_3009	0x3009
 #define PCI_DEVICE_ID_TEHUTI_3010	0x3010
-- 
2.52.0