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Date: Thu, 23 Feb 2012 20:12:34 +0000 From: Mark Brown <broonie@...nsource.wolfsonmicro.com> To: linux-kernel@...r.kernel.org Cc: patches@...nsource.wolfsonmicro.com, Mark Brown <broonie@...nsource.wolfsonmicro.com> Subject: [PATCH] regmap: Skip hardware defaults for LZO caches Saves some I/O when resyncing; we assume that syncs start from the device reset state. Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com> --- drivers/base/regmap/regcache-lzo.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c index 5e964e9..77dc532 100644 --- a/drivers/base/regmap/regcache-lzo.c +++ b/drivers/base/regmap/regcache-lzo.c @@ -349,6 +349,12 @@ static int regcache_lzo_sync(struct regmap *map, unsigned int min, ret = regcache_read(map, i, &val); if (ret) return ret; + + /* Is this the hardware default? If so skip. */ + ret = regcache_lookup_reg(map, i); + if (ret > 0 && val == map->reg_defaults[ret].def) + continue; + map->cache_bypass = 1; ret = _regmap_write(map, i, val); map->cache_bypass = 0; -- 1.7.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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