From dc3c59847d3282271507e75a82a9d60b2dad7d9a Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Fri, 17 Feb 2012 18:57:26 +0530 Subject: 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 Signed-off-by: Mark Brown (cherry picked from commit df00c79f78d8b0ad788daf689ea461ace9d0811f) Change-Id: I4398162bd6b12689c795afe5ee02397e975e456c Signed-off-by: Laxman Dewangan Reviewed-on: http://git-master/r/87593 --- drivers/base/regmap/regcache.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers') diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 43ffcc312b44..86cc34251ac5 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -34,12 +34,17 @@ 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; -- cgit v1.2.3