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regmap: cache: Fall back to register by register read for cache defaults

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If we are unable to read the cache defaults for a regmap then fall back
on attempting to read them word by word. This is going to be painfully
slow for large regmaps but might be adequate for smaller ones.

Signed-off-by: Mark Brown <broonie@kernel.org>
[maciej: Use cache_bypass around read and skipping of unreadable regs]
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2016-02-02 10:16:51 -02:00
parent bb2bb45d1b
commit 3245d460a1
1 changed files with 30 additions and 11 deletions
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41
drivers/base/regmap/regcache.c
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@ -30,7 +30,7 @@ static int regcache_hw_init(struct regmap *map)
int i, j;
int ret;
int count;
unsigned int val;
unsigned int reg, val;
void *tmp_buf;
if (!map->num_reg_defaults_raw)
@ -67,27 +67,46 @@ static int regcache_hw_init(struct regmap *map)
ret = regmap_raw_read(map, 0, tmp_buf,
map->num_reg_defaults_raw);
map->cache_bypass = cache_bypass;
if (ret < 0)
goto err_cache_free;
map->reg_defaults_raw = tmp_buf;
map->cache_free = 1;
if (ret == 0) {
map->reg_defaults_raw = tmp_buf;
map->cache_free = 1;
} else {
kfree(tmp_buf);
}
}
/* fill the reg_defaults */
for (i = 0, j = 0; i < map->num_reg_defaults_raw; i++) {
if (regmap_volatile(map, i * map->reg_stride))
reg = i * map->reg_stride;
if (!regmap_readable(map, reg))
continue;
val = regcache_get_val(map, map->reg_defaults_raw, i);
map->reg_defaults[j].reg = i * map->reg_stride;
if (regmap_volatile(map, reg))
continue;
if (map->reg_defaults_raw) {
val = regcache_get_val(map, map->reg_defaults_raw, i);
} else {
bool cache_bypass = map->cache_bypass;
map->cache_bypass = true;
ret = regmap_read(map, reg, &val);
map->cache_bypass = cache_bypass;
if (ret != 0) {
dev_err(map->dev, "Failed to read %d: %d\n",
reg, ret);
goto err_free;
}
}
map->reg_defaults[j].reg = reg;
map->reg_defaults[j].def = val;
j++;
}
return 0;
err_cache_free:
kfree(tmp_buf);
err_free:
kfree(map->reg_defaults);