1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
index b7d16143edeb..8d0061569326 100644
--- a/drivers/base/regmap/regcache-lzo.c
+++ b/drivers/base/regmap/regcache-lzo.c
@@ -331,7 +331,8 @@ out:
         return ret;
 }
 
-static int regcache_lzo_sync(struct regmap *map)
+static int regcache_lzo_sync(struct regmap *map, unsigned int min,
+                             unsigned int max)
 {
         struct regcache_lzo_ctx **lzo_blocks;
         unsigned int val;
@@ -339,10 +340,21 @@ static int regcache_lzo_sync(struct regmap *map)
         int ret;
 
         lzo_blocks = map->cache;
-        for_each_set_bit(i, lzo_blocks[0]->sync_bmp, lzo_blocks[0]->sync_bmp_nbits) {
+        i = min;
+        for_each_set_bit_cont(i, lzo_blocks[0]->sync_bmp,
+                              lzo_blocks[0]->sync_bmp_nbits) {
+                if (i > max)
+                        continue;
+
                 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;