linux-kernel - [PATCH 2/2] PCI: Add quirk for Fintek F81504/508/512 D3 issue

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Date:   Mon,  7 Nov 2016 17:22:32 +0800
From:   "Ji-Ze Hong (Peter Hong)" <hpeter@...il.com>
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        tom_tsai@...tek.com.tw, peter_hong@...tek.com.tw,
        "Ji-Ze Hong (Peter Hong)" <hpeter+linux_kernel@...il.com>
Subject: [PATCH 2/2] PCI: Add quirk for Fintek F81504/508/512 D3 issue

Fintek F81504/508/512 PCIe-to-UART/GPIO will failed to work on Intel
Skylake platform PEG PCIe port after D0->D3->D0.

This patch will prevent it into D3 mode.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@...il.com>
---
 drivers/pci/quirks.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 182712e..ee9402f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4497,3 +4497,18 @@ static void quirk_aer_report(struct pci_dev *pdev)
 			quirk_aer_report);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_FINTEK, PCI_DEVICE_ID_F81512,
 			quirk_aer_report);
+
+/*
+ * Fintek F81504/508/512 PCIe-to-UART/GPIO will failed to work on Intel Skylake
+ * platform PEG PCIe port after D0->D3->D0.
+ */
+static void quirk_no_d3(struct pci_dev *pdev)
+{
+	pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_FINTEK, PCI_DEVICE_ID_F81504,
+			quirk_no_d3);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_FINTEK, PCI_DEVICE_ID_F81508,
+			quirk_no_d3);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_FINTEK, PCI_DEVICE_ID_F81512,
+			quirk_no_d3);
-- 
1.9.1