Commit df00c79f authored Feb 17, 2012 by Laxman Dewangan Committed by Mark Brown Feb 17, 2012

regmap: Bypassing cache when initializing cache



During regcache_init, if client has not passed the
default data of cached register then it is directly
read from the hw to initialize cache. This hw register
read happens before cache ops are initialized and hence
avoiding register read to check for the data available
on cache or not by enabling flag of cache_bypass.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

parent 8eaeb219

drivers/base/regmap/regcache.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -35,12 +35,17 @@ static int regcache_hw_init(struct regmap *map)
		return -EINVAL;

		if (!map->reg_defaults_raw) {
		u32 cache_bypass = map->cache_bypass;
		dev_warn(map->dev, "No cache defaults, reading back from HW\n");

		/* Bypass the cache access till data read from HW*/
		map->cache_bypass = 1;
		tmp_buf = kmalloc(map->cache_size_raw, GFP_KERNEL);
		if (!tmp_buf)
		return -EINVAL;
		ret = regmap_bulk_read(map, 0, tmp_buf,
		map->num_reg_defaults_raw);
		map->cache_bypass = cache_bypass;
		if (ret < 0) {
		kfree(tmp_buf);
		return ret;