regmap: rbtree: Fix register default look-up in sync
Lars-Peter Clausen [Fri, 23 Mar 2012 10:04:57 +0000 (11:04 +0100)]
The code currently passes the register offset in the current block to
regcache_lookup_reg. This works fine as long as there is only one block and with
base register of 0, but in all other cases it will look-up the default for a
wrong register, which can cause unnecessary register writes. This patch fixes
it by passing the actual register number to regcache_lookup_reg.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: <stable@vger.kernel.org>
(cherry picked from commit 4b4e9e43fd210e0cd2a5d29357e7c000e13e08ae)

Change-Id: Ibed70828471423df5432fea67316ca9ad8aeb52a
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/96497
Reviewed-by: Automatic_Commit_Validation_User

drivers/base/regmap/regcache-rbtree.c

index ea76a90..92b779e 100644 (file)
@@ -402,7 +402,7 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min,
                                                           map->cache_word_size);
 
                        /* Is this the hardware default?  If so skip. */
-                       ret = regcache_lookup_reg(map, i);
+                       ret = regcache_lookup_reg(map, regtmp);
                        if (ret >= 0 && val == map->reg_defaults[ret].def)
                                continue;