MIPS: cpu-probe: Fix FPU detection on Ingenic JZ4760(B)

[ Upstream commit fc52f92a653215fbd6bc522ac5311857b335e589 ]

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@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 0ef240adefb59d0583352ca1543c37c4efdb68c5..630fcb4cb30e73751071c5fda145ea440bef0e04 100644 (file)
--- 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;
 
                /*