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linux/arch/mips/loongson2ef
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Rong Zhang 32ec465103 MIPS: Loongson2ef: Use pcibios_align_resource() to block io range 
Loongson2ef reserves io range below 0x4000 (LOONGSON_PCI_IO_START) while
ISA-mode only IDE controller on the south bridge still has a hard
dependency on ISA IO ports.

The reservation was done by lifting loongson_pci_io_resource.start onto
0x4000. Prior to commit ae81aad5c2 ("MIPS: PCI: Use
pci_enable_resources()"), the arch specific pcibios_enable_resources()
did not check if the resources were claimed, which diverges from what
PCI core checks, effectively hiding the fact that IDE IO resources were
not properly within the resource tree. After starting to use
pcibios_enable_resources() from PCI core, enabling IDE controller fails:

  pata_cs5536 0000:00:0e.2: BAR 0 [io  0x01f0-0x01f7]: not claimed; can't enable device
  pata_cs5536 0000:00:0e.2: probe with driver pata_cs5536 failed with error -22

MIPS PCI code already has support for enforcing lower bounds using
PCIBIOS_MIN_IO in pcibios_align_resource() without altering the IO
window start address itself. Make Loongson2ef PCI code use
PCIBIOS_MIN_IO too.

Fixes: ae81aad5c2 ("MIPS: PCI: Use pci_enable_resources()")
Cc: stable@vger.kernel.org
Tested-by: Beiyan Yun <root@infi.wang>
Tested-by: Yao Zi <me@ziyao.cc>
Signed-off-by: Rong Zhang <rongrong@oss.cipunited.com>
Acked-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
History 2026-02-05 10:00:37 +01:00
..
common MIPS: Loongson2ef: Use pcibios_align_resource() to block io range 2026-02-05 10:00:37 +01:00
fuloong-2e arch: mips: Remove CONFIG_OPROFILE support 2021-01-22 12:12:26 +05:30
lemote-2f arch: mips: Remove CONFIG_OPROFILE support 2021-01-22 12:12:26 +05:30
Kconfig MIPS: Loongson: Don't select platform features with CPU 2023-04-05 09:45:09 +02:00
Makefile MIPS: Fork loongson2ef from loongson64 2019-11-01 14:30:52 -07:00
Platform MIPS: Loongson: Move arch cflags to MIPS top level Makefile 2023-04-05 09:45:09 +02:00