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authorVladimir Zapolskiy <vz@mleia.com>2016-11-28 00:15:13 +0200
committerTom Rini <trini@konsulko.com>2016-12-02 21:32:39 -0500
commitee47c4cb2b3413b3ee0edd2207de46d715b2628c (patch)
tree87e4f1be1c973597b8d69f50bf4818ae1fc39ce4
parentfd184b9c8003811d797dfc64af6375ecb43cc79d (diff)
sh4: cache: correct dcache flush to invalidate with write-back
In common usecases flush_cache() assumes both cache invalidation and write-back to memory, thus in flush_dcache_range() implementation change SH4 cache write-back only instruction 'ocbwb' with cache purge instruction 'ocbp', according to the User's Manual there should be no performance penalty for that. Note that under circumstances only cache invalidation is expected from flush_cache() call, in these occasional cases the current version of flush_cache() works, which is a wrapper over invalidate_dcache_range() at the moment, this will be fixed in the following change. Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
-rw-r--r--arch/sh/cpu/sh4/cache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sh/cpu/sh4/cache.c b/arch/sh/cpu/sh4/cache.c
index e1ee970a91c..b3e5fd55957 100644
--- a/arch/sh/cpu/sh4/cache.c
+++ b/arch/sh/cpu/sh4/cache.c
@@ -97,7 +97,7 @@ void flush_dcache_range(unsigned long start, unsigned long end)
start &= ~(L1_CACHE_BYTES - 1);
for (v = start; v < end; v += L1_CACHE_BYTES) {
- asm volatile ("ocbwb %0" : /* no output */
+ asm volatile ("ocbp %0" : /* no output */
: "m" (__m(v)));
}
}