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UPSTREAM: 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>

Bug: 274730214
Change-Id: I85f9ba5343f28b24c2b0588e8a1487d31b654283
(cherry picked from commit 3d0afe9cf1ef871a71596f990d7d2e60cc0b8669)
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
This commit is contained in:
Mark Brown
2022-06-22 18:17:23 +01:00
committed by Chunyan Zhang
parent b3ebd7ca3b
commit b099f1eb0b
1 changed files with 2 additions and 1 deletions
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3
drivers/base/regmap/regcache.c
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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);