From: Alexey Brodkin Date: Fri, 17 Nov 2017 13:02:17 +0000 (+0300) Subject: arc: cache: Add required NOPs after invalidation of instruction cache X-Git-Url: http://git.ipfire.org/?p=people%2Fms%2Fu-boot.git;a=commitdiff_plain;h=f2a226780fa0e4055bec636b8108bf7e80951174;hp=d764a20f2bcab2e76bce0751ed125b0c32f9d82f arc: cache: Add required NOPs after invalidation of instruction cache As per ARC HS databook (see chapter 5.3.3.2) it is required to add 3 NOPs after each write to IC_IVIC which we do from now on. Signed-off-by: Alexey Brodkin Cc: Eugeniy Paltsev --- diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c index cbae27e9fc..d8741fe959 100644 --- a/arch/arc/lib/cache.c +++ b/arch/arc/lib/cache.c @@ -278,6 +278,13 @@ void invalidate_icache_all(void) /* Any write to IC_IVIC register triggers invalidation of entire I$ */ if (icache_status()) { write_aux_reg(ARC_AUX_IC_IVIC, 1); + /* + * As per ARC HS databook (see chapter 5.3.3.2) + * it is required to add 3 NOPs after each write to IC_IVIC. + */ + __builtin_arc_nop(); + __builtin_arc_nop(); + __builtin_arc_nop(); read_aux_reg(ARC_AUX_IC_CTRL); /* blocks */ } }