From ad82eef3cebf8cd4f67e20b902e6d02e679e2ef1 Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <yangtiezhu@loongson.cn>
Date: Sat, 18 Jun 2022 12:50:31 +0800
Subject: [PATCH] LoongArch: Fix wrong fpu version
According to the configuration information accessible by the CPUCFG
instruction in LoongArch Reference Manual [1], FP_ver is stored in
bit [5: 3] of CPUCFG2, the current code to get fpu version is wrong,
use CPUCFG2_FPVERS to fix it.
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
Fixes: 628c3bb40e9a ("LoongArch: Add boot and setup routines")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
arch/loongarch/kernel/cpu-probe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c
index 6c87ea36b2573..529ab8f44ec6d 100644
--- a/arch/loongarch/kernel/cpu-probe.c
+++ b/arch/loongarch/kernel/cpu-probe.c
@@ -263,7 +263,7 @@ void cpu_probe(void)
c->cputype = CPU_UNKNOWN;
c->processor_id = read_cpucfg(LOONGARCH_CPUCFG0);
- c->fpu_vers = (read_cpucfg(LOONGARCH_CPUCFG2) >> 3) & 0x3;
+ c->fpu_vers = (read_cpucfg(LOONGARCH_CPUCFG2) & CPUCFG2_FPVERS) >> 3;
c->fpu_csr0 = FPU_CSR_RN;
c->fpu_mask = FPU_CSR_RSVD;
--
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