linux-kernel - [PATCH v2 2/2] PCI: mediatek: Fixup class type for MT7622

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Date:   Thu, 21 Dec 2017 10:08:50 +0800
From:   <honghui.zhang@...iatek.com>
To:     <joro@...tes.org>, <lorenzo.pieralisi@....com>,
        <treding@...dia.com>, <mark.rutland@....com>,
        <matthias.bgg@...il.com>, <robh@...nel.org>, <robin.murphy@....com>
CC:     <p.zabel@...gutronix.de>, <devicetree@...r.kernel.org>,
        <pebolle@...cali.nl>, <kendrick.hsu@...iatek.com>, <arnd@...db.de>,
        <srv_heupstream@...iatek.com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <linux-kernel@...r.kernel.org>,
        <tfiga@...gle.com>, <iommu@...ts.linux-foundation.org>,
        <robh+dt@...nel.org>, <djkurtz@...gle.com>,
        <kernel@...gutronix.de>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <l.stach@...gutronix.de>,
        <yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
        <youlin.pei@...iatek.com>, <erin.lo@...iatek.com>,
        Honghui Zhang <honghui.zhang@...iatek.com>
Subject: [PATCH v2 2/2] PCI: mediatek: Fixup class type for MT7622

From: Honghui Zhang <honghui.zhang@...iatek.com>

The host bridge of MT7622 has hardware code the class code to an
arbitrary, meaningless value, fix that.

Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
---
 drivers/pci/host/pcie-mediatek.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
index 3248771..ae8d367 100644
--- a/drivers/pci/host/pcie-mediatek.c
+++ b/drivers/pci/host/pcie-mediatek.c
@@ -1174,3 +1174,15 @@ static struct platform_driver mtk_pcie_driver = {
 	},
 };
 builtin_platform_driver(mtk_pcie_driver);
+
+/* The host bridge of MT7622 advertises the wrong device class. */
+static void mtk_fixup_class(struct pci_dev *dev)
+{
+	dev->class = PCI_CLASS_BRIDGE_PCI << 8;
+}
+
+/*
+ * The HW default value of vendor id and device id for mt7622 are 0x0e8d,
+ * 0x3258, which are arbitrary, meaningless values.
+ */
+DECLARE_PCI_FIXUP_EARLY(0x0e8d, 0x3258, mtk_fixup_class);
-- 
2.6.4