From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Wed, 25 Jan 2012 21:05:48 +0000 (+0000)
Subject: regmap: Bypass the cache when applying patches
X-Git-Tag: v3.4-rc1~126^2~2^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8a892d6996b60c822f19ad1844eb15b96ce393c7;p=karo-tx-linux.git

regmap: Bypass the cache when applying patches

Otherwise any patch that affects a register which is writable may trash
cached values.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 9c6a5c13f1da..ee36bed9479c 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -273,6 +273,7 @@ int regcache_sync(struct regmap *map)
 		goto out;
 
 	/* Apply any patch first */
+	map->cache_bypass = 1;
 	for (i = 0; i < map->patch_regs; i++) {
 		ret = _regmap_write(map, map->patch[i].reg, map->patch[i].def);
 		if (ret != 0) {
@@ -281,6 +282,7 @@ int regcache_sync(struct regmap *map)
 			goto out;
 		}
 	}
+	map->cache_bypass = 0;
 
 	if (map->cache_ops->sync) {
 		ret = map->cache_ops->sync(map);