diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-05 10:27:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-05-05 10:27:30 -0700 |
| commit | 905a6537e7640993fdbd18da6f56d86035069e88 (patch) | |
| tree | ebd062232073fd0c126da9ee24006e643404c5a1 /arch | |
| parent | 68533eb1fb197a413fd8612ebb88e111ade3beac (diff) | |
| parent | f0a6c68f69981214cb7858738dd2bc81475111f7 (diff) | |
Merge tag 'mips-fixes_5.18_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS fix from Thomas Bogendoerfer:
"Extend R4000/R4400 CPU erratum workaround to all revisions"
* tag 'mips-fixes_5.18_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: Fix CP0 counter erratum detection for R4k CPUs
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/timex.h | 8 | ||||
| -rw-r--r-- | arch/mips/kernel/time.c | 11 |
2 files changed, 7 insertions, 12 deletions
diff --git a/arch/mips/include/asm/timex.h b/arch/mips/include/asm/timex.h index b05bb70a2e46..8026baf46e72 100644 --- a/arch/mips/include/asm/timex.h +++ b/arch/mips/include/asm/timex.h @@ -40,9 +40,9 @@ typedef unsigned int cycles_t; /* - * On R4000/R4400 before version 5.0 an erratum exists such that if the - * cycle counter is read in the exact moment that it is matching the - * compare register, no interrupt will be generated. + * On R4000/R4400 an erratum exists such that if the cycle counter is + * read in the exact moment that it is matching the compare register, + * no interrupt will be generated. * * There is a suggested workaround and also the erratum can't strike if * the compare interrupt isn't being used as the clock source device. @@ -63,7 +63,7 @@ static inline int can_use_mips_counter(unsigned int prid) if (!__builtin_constant_p(cpu_has_counter)) asm volatile("" : "=m" (cpu_data[0].options)); if (likely(cpu_has_counter && - prid >= (PRID_IMP_R4000 | PRID_REV_ENCODE_44(5, 0)))) + prid > (PRID_IMP_R4000 | PRID_REV_ENCODE_44(15, 15)))) return 1; else return 0; diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c index caa01457dce6..ed339d7979f3 100644 --- a/arch/mips/kernel/time.c +++ b/arch/mips/kernel/time.c @@ -141,15 +141,10 @@ static __init int cpu_has_mfc0_count_bug(void) case CPU_R4400MC: /* * The published errata for the R4400 up to 3.0 say the CPU - * has the mfc0 from count bug. + * has the mfc0 from count bug. This seems the last version + * produced. */ - if ((current_cpu_data.processor_id & 0xff) <= 0x30) - return 1; - - /* - * we assume newer revisions are ok - */ - return 0; + return 1; } return 0; |