Huacai Chen 6061e65f95 LoongArch: Add PIO for early access before ACPI PCI root register ...

For ACPI system we suppose the ISA/LPC PIO range is registered together
with PCI root bridge. But the fact is there may be some early access to
the ISA/LPC PIO range before ACPI PCI root register (most of them are
due to abnormal BIOS). Unconditionally register the ISA/LPC PIO range
usually causes ACPI PCI root register fail because of the address range
confliction. So we add a pair of helpers: acpi_add_early_pio() to add
PIO for early access, and acpi_remove_early_pio() to remove PIO before
PCI root register. Since acpi_remove_early_pio() may be called multiple
times, we add an acpi_pio flag to ensure PIO be removed only once.

Cc: <stable@vger.kernel.org>
Tested-by: Yuanzhen Gan <elysia-best@simplelinux.cn.eu.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

2026-06-25 13:03:47 +08:00

..

acpi.c

LoongArch: Add PIO for early access before ACPI PCI root register

2026-06-25 13:03:47 +08:00

Makefile

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pci.c

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