[PATCH 5.8 257/464] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()

[Greg Kroah-Hartman]

From: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>

[ Upstream commit 14110af606965ce07abe4d121c100241c2e73b86 ]

According to the datasheet of Loongson LS7A bridge chip, the old version
of Loongson LS7A PCIE port has a wrong value about PCI class which is
0x060000, the correct value should be 0x060400, this bug can be fixed by
"dev->class = PCI_CLASS_BRIDGE_PCI << 8;" at the software level and it
was fixed in hardware in the latest LS7A versions.

In order to maintain downward compatibility, use DECLARE_PCI_FIXUP_EARLY
instead of DECLARE_PCI_FIXUP_HEADER for bridge_class_quirk() to fix it as
early as possible.

Otherwise, in the function pci_setup_device(), the related code about
"dev->class" such as "class = dev->class >> 8;" and "dev->transparent
= ((dev->class & 0xff) == 1);" maybe get wrong value without EARLY fixup.

Link: https://lore.kernel.org/r/1595065176-460-1-git-send-email-yangtiezhu@xxxxxxxxxxx
Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/pci/controller/pci-loongson.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
index 459009c8a4a02..58b862aaa6e94 100644
--- a/drivers/pci/controller/pci-loongson.c
+++ b/drivers/pci/controller/pci-loongson.c
@@ -37,11 +37,11 @@ static void bridge_class_quirk(struct pci_dev *dev)
 {
 	dev->class = PCI_CLASS_BRIDGE_PCI << 8;
 }
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
 			DEV_PCIE_PORT_0, bridge_class_quirk);
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
 			DEV_PCIE_PORT_1, bridge_class_quirk);
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
 			DEV_PCIE_PORT_2, bridge_class_quirk);
 
 static void system_bus_quirk(struct pci_dev *pdev)
-- 
2.25.1