[PATCH 3/8] MIPS: cpu-probe: Fix FPU detection on Ingenic JZ4760(B)

From: Paul Cercueil
Date: Sun May 30 2021 - 13:18:44 EST


Ingenic JZ4760 and JZ4760B do have a FPU, but the config registers don't
report it. Force the FPU detection in case the processor ID match the
JZ4760(B) one.

Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
---
arch/mips/kernel/cpu-probe.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 0ef240adefb5..630fcb4cb30e 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -1840,6 +1840,11 @@ static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
*/
case PRID_COMP_INGENIC_D0:
c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+
+ /* FPU is not properly detected on JZ4760(B). */
+ if (c->processor_id == 0x2ed0024f)
+ c->options |= MIPS_CPU_FPU;
+
fallthrough;

/*
--
2.30.2