[PATCH 6.18 661/752] MIPS: Loongson2ef: Register PCI controller in early stage

Sasha Levin
2026-02-28T17:57:56Z

From: Rong Zhang <rongrong@oss.cipunited.com>

[ Upstream commit 6a00c043af07492502ba7a2263ddc4cdb01b66a7 ]

We are about to set loongson_pci_io_resource.start to 0 and adopt
PCIBIOS_MIN_IO. As the first step, PCI controller needs to be registered
in early stage to make it the root of other resources (e.g., i8259) and
prevent resource conflicts.

Register it in plat_mem_setup() instead of arch_initcall().

Fixes: ae81aad5c2e1 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/include/asm/mach-loongson2ef/loongson.h | 6 ++++++
arch/mips/loongson2ef/common/pci.c | 7 +------
arch/mips/loongson2ef/common/setup.c | 1 +
3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/mips/include/asm/mach-loongson2ef/loongson.h b/arch/mips/include/asm/mach-loongson2ef/loongson.h
index 4a098fb102325..0e586787eb87a 100644
--- a/arch/mips/include/asm/mach-loongson2ef/loongson.h
+++ b/arch/mips/include/asm/mach-loongson2ef/loongson.h
@@ -324,4 +324,10 @@ extern unsigned long _loongson_addrwincfg_base;

#endif /* ! CONFIG_CPU_SUPPORTS_ADDRWINCFG */

+#ifdef CONFIG_PCI
+void loongson2ef_pcibios_init(void);
+#else
+static inline void loongson2ef_pcibios_init(void) { }
+#endif
+
#endif /* __ASM_MACH_LOONGSON2EF_LOONGSON_H */
diff --git a/arch/mips/loongson2ef/common/pci.c b/arch/mips/loongson2ef/common/pci.c
index 7d9ea51e8c01e..55524f9a7b96b 100644
--- a/arch/mips/loongson2ef/common/pci.c
+++ b/arch/mips/loongson2ef/common/pci.c
@@ -73,15 +73,10 @@ static void __init setup_pcimap(void)
#endif
}

-static int __init pcibios_init(void)
+void __init loongson2ef_pcibios_init(void)
{
setup_pcimap();

loongson_pci_controller.io_map_base = mips_io_port_base;
register_pci_controller(&loongson_pci_controller);
-
-
- return 0;
}
-
-arch_initcall(pcibios_init);
diff --git a/arch/mips/loongson2ef/common/setup.c b/arch/mips/loongson2ef/common/setup.c
index 4fd27f4f90edb..a639e35acce59 100644
--- a/arch/mips/loongson2ef/common/setup.c
+++ b/arch/mips/loongson2ef/common/setup.c
@@ -27,4 +27,5 @@ EXPORT_SYMBOL(__wbflush);

void __init plat_mem_setup(void)
{
+ loongson2ef_pcibios_init();
}
--
2.51.0