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regmap: debugfs: Optimize seeking within blocks of registers

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Optimize this so that we can better guess where to start scanning
from.  We know the length of the register field format, therefore
given the file pointer position align to the nearest register
field and scan from there onwards.  We round down in this calculation
and we let the rest of the code figure out where to start scanning
from.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Dimitris Papastamos 2013-02-08 12:47:20 +00:00 committed by Mark Brown
parent c2c1ee6601
commit cf57d6071f
1 changed files with 7 additions and 5 deletions
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12
drivers/base/regmap/regmap-debugfs.c
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@ -139,15 +139,17 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
WARN_ON(list_empty(&map->debugfs_off_cache));
ret = base;
/* Find the relevant block */
/* Find the relevant block:offset */
list_for_each_entry(c, &map->debugfs_off_cache, list) {
if (from >= c->min && from <= c->max) {
*pos = c->min;
return c->base_reg;
fpos_offset = from - c->min;
reg_offset = fpos_offset / map->debugfs_tot_len;
*pos = c->min + (reg_offset * map->debugfs_tot_len);
return c->base_reg + reg_offset;
}
*pos = c->min;
ret = c->base_reg;
*pos = c->max;
ret = c->max_reg;
}
return ret;