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regmap: Don't warn about cache only mode for devices with no cache

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For devices with no cache it can make sense to use cache only mode as a
mechanism for trapping writes to hardware which is inaccessible but since
no cache is equivalent to cache bypass we force such devices into bypass
mode. This means that our check that bypass and cache only mode aren't both
enabled simultanously is less sensible for devices without a cache so relax
it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220622171723.1235749-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown
2022-06-22 18:17:23 +01:00
parent 26968e614a
commit 3d0afe9cf1
1 changed files with 2 additions and 1 deletions
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drivers/base/regmap/regcache.c
+2 -1
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@@ -495,7 +495,8 @@ EXPORT_SYMBOL_GPL(regcache_drop_region);
void regcache_cache_only(struct regmap *map, bool enable)
{
map->lock(map->lock_arg);
WARN_ON(map->cache_bypass && enable);
WARN_ON(map->cache_type != REGCACHE_NONE &&
map->cache_bypass && enable);
map->cache_only = enable;
trace_regmap_cache_only(map, enable);
map->unlock(map->lock_arg);