Revert "regmap: Ensure range selector registers are updated after cac…

…he sync" This reverts commit 117ccba. The reverted commit breaks at least some I2C-based soundcards, and possibly much more. Thanks for pointing the finger, HiassofT. See: #5763 Signed-off-by: Phil Elwell <[email protected]>
raspberrypi · Dec 1, 2023 · 7bbbfb8 · 7bbbfb8
1 parent a726183
commit 7bbbfb8
Showing 1 changed file with 0 additions and 30 deletions.
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
@@ -334,11 +334,6 @@ static int regcache_default_sync(struct regmap *map, unsigned int min,
 	return 0;
 }
 
-static int rbtree_all(const void *key, const struct rb_node *node)
-{
-	return 0;
-}
-
 /**
  * regcache_sync - Sync the register cache with the hardware.
  *
@@ -356,7 +351,6 @@ int regcache_sync(struct regmap *map)
 	unsigned int i;
 	const char *name;
 	bool bypass;
-	struct rb_node *node;
 
 	if (WARN_ON(map->cache_type == REGCACHE_NONE))
 		return -EINVAL;
@@ -398,30 +392,6 @@ int regcache_sync(struct regmap *map)
 	/* Restore the bypass state */
 	map->cache_bypass = bypass;
 	map->no_sync_defaults = false;
-
-	/*
-	 * If we did any paging with cache bypassed and a cached
-	 * paging register then the register and cache state might
-	 * have gone out of sync, force writes of all the paging
-	 * registers.
-	 */
-	rb_for_each(node, 0, &map->range_tree, rbtree_all) {
-		struct regmap_range_node *this =
-			rb_entry(node, struct regmap_range_node, node);
-
-		/* If there's nothing in the cache there's nothing to sync */
-		ret = regcache_read(map, this->selector_reg, &i);
-		if (ret != 0)
-			continue;
-
-		ret = _regmap_write(map, this->selector_reg, i);
-		if (ret != 0) {
-			dev_err(map->dev, "Failed to write %x = %x: %d\n",
-				this->selector_reg, i, ret);
-			break;
-		}
-	}
-
 	map->unlock(map->lock_arg);
 
 	regmap_async_complete(map);