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| author | Paul Burton <paul.burton@imgtec.com> | 2016-08-19 18:18:28 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-09-29 18:59:49 +0200 |
| commit | 67acd8d5c606cf42e6726767d705851dec9f6a34 (patch) | |
| tree | f47a7004f00792f0c9c05590dda085bdfa2e1a72 | |
| parent | ebd0e0f503d0774407a63ebb5ec1a90bb54941f5 (diff) | |
| download | linux-0-day-67acd8d5c606cf42e6726767d705851dec9f6a34.tar.gz linux-0-day-67acd8d5c606cf42e6726767d705851dec9f6a34.tar.xz | |
MIPS: clear execution hazard after changing FTLB enable
On current P-series cores from Imagination the FTLB can be enabled or
disabled via a bit in the Config6 register, and an execution hazard is
created by changing the value of bit. The ftlb_disable function already
cleared that hazard but that does no good for other callers. Clear the
hazard in the set_ftlb_enable function that creates it, and only for the
cores where it applies.
This has the effect of reverting c982c6d6c48b ("MIPS: cpu-probe: Remove
cp0 hazard barrier when enabling the FTLB") which was incorrect.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: c982c6d6c48b ("MIPS: cpu-probe: Remove cp0 hazard barrier when enabling the FTLB")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14023/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 5069b5b1488f9..dd3175442c9e6 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -376,8 +376,6 @@ static int __init ftlb_disable(char *s) return 1; } - back_to_back_c0_hazard(); - config4 = read_c0_config4(); /* Check that FTLB has been disabled */ @@ -560,6 +558,7 @@ static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) } write_c0_config6(config); + back_to_back_c0_hazard(); break; case CPU_I6400: /* There's no way to disable the FTLB */ |