regmap: cache: Use raw I/O to sync rbtrees if we can

This will bring no meaningful benefit by itself, it is done as a separate
commit to aid bisection if there are problems with the following commits
adding support for coalescing adjacent writes.

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

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 792a760c8ab1..382a6deb3ca8 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -55,6 +55,12 @@ static unsigned int regcache_rbtree_get_register(struct regmap *map,
         return regcache_get_val(map, rbnode->block, idx);
 }
 
+static const void *regcache_rbtree_get_reg_addr(struct regmap *map,
+        struct regcache_rbtree_node *rbnode, unsigned int idx)
+{
+        return regcache_get_val_addr(map, rbnode->block, idx);
+}
+
 static void regcache_rbtree_set_register(struct regmap *map,
                                          struct regcache_rbtree_node *rbnode,
                                          unsigned int idx, unsigned int val)
@@ -442,6 +448,7 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min,
         struct regcache_rbtree_node *rbnode;
         unsigned int regtmp;
         unsigned int val;
+        const void *addr;
         int ret;
         int i, base, end;
 
@@ -480,7 +487,17 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min,
                                 continue;
 
                         map->cache_bypass = 1;
-                        ret = _regmap_write(map, regtmp, val);
+
+                        if (regmap_can_raw_write(map)) {
+                                addr = regcache_rbtree_get_reg_addr(map,
+                                                                    rbnode, i);
+                                ret = _regmap_raw_write(map, regtmp, addr,
+                                                        map->format.val_bytes,
+                                                        false);
+                        } else {
+                                ret = _regmap_write(map, regtmp, val);
+                        }
+
                         map->cache_bypass = 0;
                         if (ret)
                                 return ret;