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regcache: Split regcache_count_cacheable_registers() helper

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The introduced helper allows to check for the non-cacheable configurations
earlier during initialisation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260210161058.53093-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2026-02-10 17:09:09 +01:00 committed by Mark Brown
parent 1fcf171178
commit c2bcf62ca7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 19 additions and 11 deletions
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30
drivers/base/regmap/regcache.c
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@ -42,13 +42,10 @@ void regcache_sort_defaults(struct reg_default *defaults, unsigned int ndefaults
}
EXPORT_SYMBOL_GPL(regcache_sort_defaults);
static int regcache_hw_init(struct regmap *map)
static int regcache_count_cacheable_registers(struct regmap *map)
{
int i, j;
int ret;
int count;
unsigned int reg, val;
void *tmp_buf;
int i;
/* calculate the size of reg_defaults */
for (count = 0, i = 0; i < map->num_reg_defaults_raw; i++)
@ -57,10 +54,18 @@ static int regcache_hw_init(struct regmap *map)
count++;
/* all registers are unreadable or volatile, so just bypass */
if (!count) {
if (!count)
map->cache_bypass = true;
return 0;
}
return count;
}
static int regcache_hw_init(struct regmap *map, int count)
{
int i, j;
int ret;
unsigned int reg, val;
void *tmp_buf;
map->num_reg_defaults = count;
map->reg_defaults = kmalloc_objs(struct reg_default, count);
@ -129,6 +134,7 @@ static int regcache_hw_init(struct regmap *map)
int regcache_init(struct regmap *map, const struct regmap_config *config)
{
int count = 0;
int ret;
int i;
void *tmp_buf;
@ -193,15 +199,17 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
return -ENOMEM;
map->reg_defaults = tmp_buf;
} else if (map->num_reg_defaults_raw) {
count = regcache_count_cacheable_registers(map);
if (map->cache_bypass)
return 0;
/* Some devices such as PMICs don't have cache defaults,
* we cope with this by reading back the HW registers and
* crafting the cache defaults by hand.
*/
ret = regcache_hw_init(map);
ret = regcache_hw_init(map, count);
if (ret < 0)
return ret;
if (map->cache_bypass)
return 0;
}
if (!map->max_register_is_set && map->num_reg_defaults_raw) {