linux-kernel - [RFC PATCH v2] PCI/portdrv: Support for subtractive decode bridge

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Date:   Thu, 14 Feb 2019 13:21:17 +0800
From:   <honghui.zhang@...iatek.com>
To:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ryder.lee@...iatek.com>,
        <matthias.bgg@...il.com>
CC:     <rafael.j.wysocki@...el.com>, <fred@...dlawl.com>,
        <poza@...eaurora.org>, <youlin.pei@...iatek.com>,
        <jianjun.wang@...iatek.com>,
        Honghui Zhang <honghui.zhang@...iatek.com>
Subject: [RFC PATCH v2] PCI/portdrv: Support for subtractive decode bridge

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

The Class Code for subtractive decode PCI-to-PCI bridge is 060401h,
add one entry to make portdrv support this type bridge.

Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
---
 drivers/pci/pcie/portdrv_pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 0acca35..c129f2f 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -185,6 +185,8 @@ static void pcie_portdrv_err_resume(struct pci_dev *dev)
 static const struct pci_device_id port_pci_ids[] = { {
 	/* handle any PCI-Express port */
 	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
+	/* subtractive decode PCI-to-PCI bridge, class type is 060401h */
+	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x01), ~0),
 	}, { /* end: all zeroes */ }
 };
 
-- 
2.6.4