Commit a1c119e3 authored by Baoqi Zhang's avatar Baoqi Zhang Committed by Hongchen Zhang
Browse files

LS7A2000: PCIE: Fixup GPU card error 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP



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

Add window to solve GPU access error

Signed-off-by: default avatarBaoqi Zhang <zhangbaoqi@loongson.cn>
Change-Id: Idb607fa22e68e06fc4448af57247bd4e51616a7d
parent d6ac51fc

drivers/pci/controller/pci-loongson.c

+38 −0
Original line number Diff line number Diff line
@@ -157,6 +157,44 @@ static void loongson_ohci_quirk(struct pci_dev *dev) 
}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, DEV_LS7A_OHCI, loongson_ohci_quirk);



static void loongson_display_quirk(struct pci_dev *dev)

{

	u32 val;

	u64 mask, size;

	u64 max_size = 0;

	int i, num;

	struct pci_bus *bus = dev->bus;



	if (!dev->bus->number) {

		if (!(dev->vendor == PCI_VENDOR_ID_LOONGSON && dev->device == 0x7a25))

			return;

	} else {

		while (!pci_is_root_bus(bus->parent))

			bus = bus->parent;



		/* ensure slot is 7a2000 */

		if (bus->self->vendor != PCI_VENDOR_ID_LOONGSON || bus->self->device < 0x7a39)

			return;

	}

	max_size = 0;

	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {

		if (dev->resource[i].flags & IORESOURCE_MEM) {

			size = dev->resource[i].end - dev->resource[i].start;

			if (size > max_size) {

				max_size = size;

				num = i;

			}

		}

	}

	mask = ~(dev->resource[num].end - dev->resource[num].start);

	val = (dev->resource[num].start >> (24 - 16)) | ((mask >> 24) & 0xffff);

	writel(val, (volatile void *)0x80000efdfb000174UL);

	writel(0x80000000, (volatile void *)0x80000efdfb000170UL);

}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LOONGSON, 0x7a25, loongson_display_quirk);

DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,

				PCI_BASE_CLASS_DISPLAY, 16, loongson_display_quirk);



static struct loongson_pci *pci_bus_to_loongson_pci(struct pci_bus *bus)

{

	struct pci_config_window *cfg;