This is a note to let you know that I've just added the patch titled
MIPS: cpu-probe: Fix FPU detection on Ingenic JZ4760(B)
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-cpu-probe-fix-fpu-detection-on-ingenic-jz4760-b.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b46f22867dd58d431d457e0786a46f768946a3e2
Author: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Date: Sun May 30 18:17:57 2021 +0100
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@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index e6ae2bcdbeda..067cb3eb1614 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -1827,6 +1827,11 @@ 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;
/*
