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regmap: Add can_sleep configuration option

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Regmap can't sleep if spinlock is used for the locking protection.
This patch fixes regression caused by a previous commit that switched
regmap to use fsleep() and this broke Amlogic S922X platform.

This patch adds new configuration option for regmap users, allowing to
specify whether regmap operations can sleep and assuming that sleep is
allowed if mutex is used for the regmap locking protection.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: 2b32d2f7ce ("regmap: Use flexible sleep")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200902141843.6591-1-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Osipenko 2020-09-02 17:18:43 +03:00 committed by Mark Brown
parent d17343b87d
commit 21f8e4828c
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
3 changed files with 21 additions and 4 deletions
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3
drivers/base/regmap/internal.h
View file

@ -161,6 +161,9 @@ struct regmap {
void *selector_work_buf; /* Scratch buffer used for selector */
struct hwspinlock *hwlock;
/* if set, the regmap core can sleep */
bool can_sleep;
};
struct regcache_ops {

19
drivers/base/regmap/regmap.c
View file

@ -697,11 +697,13 @@ struct regmap *__regmap_init(struct device *dev,
if (config->disable_locking) {
map->lock = map->unlock = regmap_lock_unlock_none;
map->can_sleep = config->can_sleep;
regmap_debugfs_disable(map);
} else if (config->lock && config->unlock) {
map->lock = config->lock;
map->unlock = config->unlock;
map->lock_arg = config->lock_arg;
map->can_sleep = config->can_sleep;
} else if (config->use_hwlock) {
map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
if (!map->hwlock) {
@ -737,6 +739,7 @@ struct regmap *__regmap_init(struct device *dev,
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;
map->unlock = regmap_unlock_mutex;
map->can_sleep = true;
lockdep_set_class_and_name(&map->mutex,
lock_key, lock_name);
}
@ -2230,8 +2233,12 @@ static int _regmap_range_multi_paged_reg_write(struct regmap *map,
if (ret != 0)
return ret;
if (regs[i].delay_us)
fsleep(regs[i].delay_us);
if (regs[i].delay_us) {
if (map->can_sleep)
fsleep(regs[i].delay_us);
else
udelay(regs[i].delay_us);
}
base += n;
n = 0;
@ -2267,8 +2274,12 @@ static int _regmap_multi_reg_write(struct regmap *map,
if (ret != 0)
return ret;
if (regs[i].delay_us)
fsleep(regs[i].delay_us);
if (regs[i].delay_us) {
if (map->can_sleep)
fsleep(regs[i].delay_us);
else
udelay(regs[i].delay_us);
}
}
return 0;
}

3
include/linux/regmap.h
View file

@ -342,6 +342,7 @@ typedef void (*regmap_unlock)(void *);
* @hwlock_id: Specify the hardware spinlock id.
* @hwlock_mode: The hardware spinlock mode, should be HWLOCK_IRQSTATE,
* HWLOCK_IRQ or 0.
* @can_sleep: Optional, specifies whether regmap operations can sleep.
*/
struct regmap_config {
const char *name;
@ -398,6 +399,8 @@ struct regmap_config {
bool use_hwlock;
unsigned int hwlock_id;
unsigned int hwlock_mode;
bool can_sleep;
};
/**