linux-kernel - [PATCH v3] PCI: Mask replay timer timeout of GL975x's rootport

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Date: Wed, 27 Mar 2024 10:45:09 +0800
From: Kai-Heng Feng <kai.heng.feng@...onical.com>
To: bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kai-Heng Feng <kai.heng.feng@...onical.com>,
	Victor Shih <victor.shih@...esyslogic.com.tw>,
	Ben Chuang <benchuanggli@...il.com>
Subject: [PATCH v3] PCI: Mask replay timer timeout of GL975x's rootport

Any access to GL975x's config space, like `lspci -vv` or
pci_save_state(), can still trigger the replay timer timeout error even
after commit 015c9cbcf0ad ("mmc: sdhci-pci-gli: GL9750: Mask the replay
timer timeout of AER"), albeit with a lower reproduce rate.

The AER interrupt can prevent the system from suspending, or can flood
the kernel message. So mask the replay timer timeout to resolve the
issue.

Cc: Victor Shih <victor.shih@...esyslogic.com.tw>
Cc: Ben Chuang <benchuanggli@...il.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/pci/quirks.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index ea476252280a..7ad7141e1c54 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6223,3 +6223,22 @@ static void pci_fixup_d3cold_delay_1sec(struct pci_dev *pdev)
 	pdev->d3cold_delay = 1000;
 }
 DECLARE_PCI_FIXUP_FINAL(0x5555, 0x0004, pci_fixup_d3cold_delay_1sec);
+
+#ifdef CONFIG_PCIEAER
+static void pci_mask_replay_timer_timeout(struct pci_dev *pdev)
+{
+	struct pci_dev *parent = pci_upstream_bridge(pdev);
+	u32 val;
+
+	if (!parent || !parent->aer_cap)
+		return;
+
+	pci_info(pdev, "Mask AER due to hardware defect");
+
+	pci_read_config_dword(parent, parent->aer_cap + PCI_ERR_COR_MASK, &val);
+	val |= PCI_ERR_COR_REP_TIMER;
+	pci_write_config_dword(parent, parent->aer_cap + PCI_ERR_COR_MASK, val);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9750, pci_mask_replay_timer_timeout);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9755, pci_mask_replay_timer_timeout);
+#endif
-- 
2.34.1