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regulator: core: add support to log enabled regulators during suspend

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Add support to print a list of enabled regulators in the
kernel log.  This is useful when debugging low power modes
during suspend.

Change-Id: I78acb1285caeaeccd30efc16bb5bc001f66bdf33
Signed-off-by: David Collins <collinsd@codeaurora.org>
This commit is contained in:
David Collins 2019-03-13 14:14:04 -07:00
parent 6e9f8d3097
commit 95d18be616
2 changed files with 73 additions and 0 deletions
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69
drivers/regulator/core.c
View File

@ -57,6 +57,7 @@ static LIST_HEAD(regulator_map_list);
static LIST_HEAD(regulator_ena_gpio_list);
static LIST_HEAD(regulator_supply_alias_list);
static bool has_full_constraints;
static bool debug_suspend;
static struct dentry *debugfs_root;
@ -5120,6 +5121,71 @@ static const struct file_operations regulator_summary_fops = {
#endif
};
static int _regulator_debug_print_enabled(struct device *dev, void *data)
{
struct regulator_dev *rdev = dev_to_rdev(dev);
struct regulator *reg;
const char *supply_name;
int mode = -EPERM;
int uV = -EPERM;
if (_regulator_is_enabled(rdev) <= 0)
return 0;
uV = _regulator_get_voltage(rdev);
if (rdev->desc->ops->get_mode)
mode = rdev->desc->ops->get_mode(rdev);
if (uV != -EPERM && mode != -EPERM)
pr_info("%s[%u] %d uV, mode=%d\n",
rdev_get_name(rdev), rdev->use_count, uV, mode);
else if (uV != -EPERM)
pr_info("%s[%u] %d uV\n",
rdev_get_name(rdev), rdev->use_count, uV);
else if (mode != -EPERM)
pr_info("%s[%u], mode=%d\n",
rdev_get_name(rdev), rdev->use_count, mode);
else
pr_info("%s[%u]\n", rdev_get_name(rdev), rdev->use_count);
/* Print a header if there are consumers. */
if (rdev->open_count)
pr_info(" %-32s EN Min_uV Max_uV load_uA\n",
"Device-Supply");
list_for_each_entry(reg, &rdev->consumer_list, list) {
if (reg->supply_name)
supply_name = reg->supply_name;
else
supply_name = "(null)-(null)";
pr_info(" %-32s %d %8d %8d %8d\n", supply_name, reg->enabled,
reg->voltage[PM_SUSPEND_ON].min_uV,
reg->voltage[PM_SUSPEND_ON].max_uV,
reg->uA_load);
}
return 0;
}
/**
* regulator_debug_print_enabled - log enabled regulators
*
* Print the names of all enabled regulators and their consumers to the kernel
* log if debug_suspend is set from debugfs.
*/
void regulator_debug_print_enabled(void)
{
if (likely(!debug_suspend))
return;
pr_info("Enabled regulators:\n");
class_for_each_device(&regulator_class, NULL, NULL,
_regulator_debug_print_enabled);
}
EXPORT_SYMBOL(regulator_debug_print_enabled);
static int __init regulator_init(void)
{
int ret;
@ -5136,6 +5202,9 @@ static int __init regulator_init(void)
debugfs_create_file("regulator_summary", 0444, debugfs_root,
NULL, &regulator_summary_fops);
debugfs_create_bool("debug_suspend", 0644, debugfs_root,
&debug_suspend);
regulator_dummy_init();
return ret;

4
include/linux/regulator/machine.h
View File

@ -247,10 +247,14 @@ struct regulator_init_data {
#ifdef CONFIG_REGULATOR
void regulator_has_full_constraints(void);
void regulator_debug_print_enabled(void);
#else
static inline void regulator_has_full_constraints(void)
{
}
static void regulator_debug_print_enabled(void)
{
}
#endif
static inline int regulator_suspend_prepare(suspend_state_t state)