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PCI: loongson: Work around LS7A incorrect Interrupt Pin registers

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Several devices integrated into LS7A report 1 (which means they use
INTA) in their Interrupt Pin registers, but they actually use a different
interrupt.

Add a quirk to override the incorrect Interrupt Pin values.

This is only needed by ACPI-based systems. For DT-based systems,
pci_assign_irq() ignores the Interrupt Pin register except to learn that
the device uses INTx and the host bridge .map_irq() function
(loongson_map_irq()) learns the IRQ mapping via DT and of_irq_parse_pci().

[bhelgaas: drop PCIE_PORT_x, OHCI, GPU since they are function 0 and don't
need the quirk, squash in updates from
https://lore.kernel.org/r/CAAhV-H40_o+9KS1t67O98GusM38pDaiB4bssxd3KQZpAByfnLg@mail.gmail.com]
Link: https://lore.kernel.org/r/20220714124216.1489304-8-chenhuacai@loongson.cn
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jianmin Lv 2022-07-14 20:42:16 +08:00 committed by Bjorn Helgaas
parent 2410e3301f
commit 930c6074d7
1 changed files with 27 additions and 1 deletions
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28
drivers/pci/controller/pci-loongson.c
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@ -20,8 +20,15 @@
#define DEV_PCIE_PORT_2 0x7a29
#define DEV_LS2K_APB 0x7a02
#define DEV_LS7A_CONF 0x7a10
#define DEV_LS7A_GMAC 0x7a03
#define DEV_LS7A_DC1 0x7a06
#define DEV_LS7A_LPC 0x7a0c
#define DEV_LS7A_AHCI 0x7a08
#define DEV_LS7A_CONF 0x7a10
#define DEV_LS7A_GNET 0x7a13
#define DEV_LS7A_EHCI 0x7a14
#define DEV_LS7A_DC2 0x7a36
#define DEV_LS7A_HDMI 0x7a37
#define FLAG_CFG0 BIT(0)
#define FLAG_CFG1 BIT(1)
@ -100,6 +107,25 @@ static void loongson_mrrs_quirk(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, loongson_mrrs_quirk);
static void loongson_pci_pin_quirk(struct pci_dev *pdev)
{
pdev->pin = 1 + (PCI_FUNC(pdev->devfn) & 3);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_DC1, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_DC2, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_GMAC, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_AHCI, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_EHCI, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_GNET, loongson_pci_pin_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON,
DEV_LS7A_HDMI, loongson_pci_pin_quirk);
static struct loongson_pci *pci_bus_to_loongson_pci(struct pci_bus *bus)
{
struct pci_config_window *cfg;