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MIPS: Loongson64: Correct TLB type for Loongson-3 Classic 

Huacai just informed me that some early Loongson-3A2000 had wrong
TLB type in Config0 register. That means we have to correct it via
PRID.

It looks like I shoudn't drop MIPS_CPU_FTLB flag in PRID case for
Loongson-3 Classic.

Fixes: da1bd29742 ("MIPS: Loongson64: Probe CPU features via CPUCFG")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reported-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jiaxun Yang 2020-05-01 00:48:02 +08:00 committed by Thomas Bogendoerfer
parent da1bd29742
commit 3aed240e57
1 changed files with 4 additions and 1 deletions
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5
arch/mips/kernel/cpu-probe.c
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@ -1999,8 +1999,11 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
* Loongson-3 Classic did not implement MIPS standard TLBINV
* but implemented TLBINVF and EHINV. As currently we're only
* using these two features, enable MIPS_CPU_TLBINV as well.
*
* Also some early Loongson-3A2000 had wrong TLB type in Config
* register, we correct it here.
*/
c->options |= MIPS_CPU_TLBINV | MIPS_CPU_LDPTE;
c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE;
c->writecombine = _CACHE_UNCACHED_ACCELERATED;
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);