Commit 0b539b10 authored by Zhao Qunqin's avatar Zhao Qunqin Committed by Hongchen Zhang
Browse files

pci/quirks: LS7A2000: fix pm transition of devices under pcie port 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBENRY


CVE: NA

--------------------------------

The CPU may not be able to access the PCI header of the device if
it is in low-power mode.

Signed-off-by: default avatarZhao Qunqin <zhaoqunqin@loongson.cn>
parent ae05f7e5

drivers/pci/quirks.c

+30 −0
Original line number Diff line number Diff line
@@ -410,6 +410,36 @@ static void loongson_pcie_msi_quirk(struct pci_dev *dev) 
}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, 0x7a59, loongson_pcie_msi_quirk);



#define DEV_PCIE_PORT_4	0x7a39

#define DEV_PCIE_PORT_5	0x7a49

#define DEV_PCIE_PORT_6	0x7a59

#define DEV_PCIE_PORT_7	0x7a69

static void loongson_d3_and_link_quirk(struct pci_dev *dev)

{

	struct pci_bus *bus = dev->bus;

	struct pci_dev *bridge;

	static const struct pci_device_id bridge_devids[] = {

		{ PCI_VDEVICE(LOONGSON, DEV_PCIE_PORT_4) },

		{ PCI_VDEVICE(LOONGSON, DEV_PCIE_PORT_5) },

		{ PCI_VDEVICE(LOONGSON, DEV_PCIE_PORT_6) },

		{ PCI_VDEVICE(LOONGSON, DEV_PCIE_PORT_7) },

		{ 0, },

	};



	/* look for the matching bridge */

	while (!pci_is_root_bus(bus)) {

		bridge = bus->self;

		bus = bus->parent;

		if (bridge && pci_match_id(bridge_devids, bridge)) {

			dev->dev_flags |= (PCI_DEV_FLAGS_NO_D3 |

				PCI_DEV_FLAGS_NO_LINK_SPEED_CHANGE);

			dev->no_d1d2 = 1;

		break;

		}

	}

}

DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, loongson_d3_and_link_quirk);



/* Chipsets where PCI->PCI transfers vanish or hang */

static void quirk_nopcipci(struct pci_dev *dev)

{

include/linux/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -246,6 +246,7 @@ enum pci_dev_flags { 
	PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),

	/* Device does honor MSI masking despite saying otherwise */

	PCI_DEV_FLAGS_HAS_MSI_MASKING = (__force pci_dev_flags_t) (1 << 12),

	PCI_DEV_FLAGS_NO_LINK_SPEED_CHANGE = (__force pci_dev_flags_t) (1 << 15),

};



enum pci_irq_reroute_variant {