From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 23 Feb 2012 20:11:58 +0000 (+0000)
Subject: regmap: Skip hardware defaults for LZO caches
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a3c3774176838bbfa4f6e48133644903818e56dc;p=linux-beck.git

regmap: Skip hardware defaults for LZO caches

Saves some I/O when resyncing; we assume that syncs start from the device
reset state.

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

diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
index b7d16143edeb..3025cf920f25 100644
--- a/drivers/base/regmap/regcache-lzo.c
+++ b/drivers/base/regmap/regcache-lzo.c
@@ -343,6 +343,12 @@ static int regcache_lzo_sync(struct regmap *map)
 		ret = regcache_read(map, i, &val);
 		if (ret)
 			return ret;
+
+		/* Is this the hardware default?  If so skip. */
+		ret = regcache_lookup_reg(map, i);
+		if (ret > 0 && val == map->reg_defaults[ret].def)
+			continue;
+
 		map->cache_bypass = 1;
 		ret = _regmap_write(map, i, val);
 		map->cache_bypass = 0;