diff options
| author | Tiezhu Yang <yangtiezhu@loongson.cn> | 2020-07-18 17:39:36 +0800 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2020-07-20 14:55:48 +0100 |
| commit | 14110af606965ce07abe4d121c100241c2e73b86 (patch) | |
| tree | 9f2f56ee636eb842a92b933a501afa37c7125cac /drivers/pci/controller/pci-loongson.c | |
| parent | b3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff) | |
PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
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@loongson.cn
Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/pci/controller/pci-loongson.c')
| -rw-r--r-- | drivers/pci/controller/pci-loongson.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c index 459009c8a4a0..58b862aaa6e9 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) |