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Subject[PATCH] MIPS: jz4740: Fix Ingenic SoCs sometimes reporting wrong ISA
Date
The config0 register in the Xburst always reports a MIPS32r2
ISA, but not all of them support it.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
arch/mips/jz4740/setup.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index 7e63c54eb8d2..2508c026bdfa 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -64,6 +64,7 @@ static unsigned long __init get_board_mach_type(const void *fdt)

void __init plat_mem_setup(void)
{
+ struct cpuinfo_mips *c = &current_cpu_data;
int offset;
void *dtb;

@@ -81,6 +82,18 @@ void __init plat_mem_setup(void)
jz4740_detect_mem();

mips_machtype = get_board_mach_type(dtb);
+
+ switch (mips_machtype) {
+ case MACH_INGENIC_JZ4740:
+ /*
+ * The config0 register in the Xburst always reports a MIPS32r2
+ * ISA, but not all of them support it.
+ */
+ c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+ break;
+ default:
+ break;
+ }
}

void __init device_tree_init(void)
--
2.21.0.593.g511ec345e18
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