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regulator: Check status before disabling

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When disabling regulator when they are unused, check before is they are
enabled.
While here don't check the enable_cnt on the regulator entry as it is
checked by regnode_stop.
This solve the panic on any board using a fixed regulator that is driven
by a gpio when the regulator is unused.

Tested On: OrangePi One
Pointy Hat to:	    myself
Reported by:	kevans, Milan Obuch (freebsd-arm@dino.sk)
This commit is contained in:
Emmanuel Vadot 2018-04-20 20:30:33 +00:00
parent c712135a32
commit bfeb2bd7ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332843
1 changed files with 5 additions and 3 deletions
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8
sys/dev/extres/regulator/regulator.c
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@ -166,17 +166,19 @@ static void
regulator_shutdown(void *dummy)
{
struct regnode *entry;
int status, ret;
int disable = 1;
REG_TOPO_SLOCK();
TUNABLE_INT_FETCH("hw.regulator.disable_unused", &disable);
TAILQ_FOREACH(entry, &regnode_list, reglist_link) {
if (entry->enable_cnt == 0 &&
entry->std_param.always_on == 0 && disable) {
if (entry->std_param.always_on == 0 && disable) {
if (bootverbose)
printf("regulator: shuting down %s\n",
entry->name);
regnode_stop(entry, 0);
ret = regnode_status(entry, &status);
if (ret == 0 && status == REGULATOR_STATUS_ENABLED)
regnode_stop(entry, 0);
}
}
REG_TOPO_UNLOCK();