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@opensource.wolfsonmicro.com>
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@ -343,6 +343,12 @@ static int regcache_lzo_sync(struct regmap *map)
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ret = regcache_read(map, i, &val);
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if (ret)
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return ret;
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/* Is this the hardware default? If so skip. */
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ret = regcache_lookup_reg(map, i);
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if (ret > 0 && val == map->reg_defaults[ret].def)
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continue;
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map->cache_bypass = 1;
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ret = _regmap_write(map, i, val);
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map->cache_bypass = 0;
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