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PM / Domains: Deal with multiple states but no governor in genpd

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[ Upstream commit 2c9b7f8772033cc8bafbd4eefe2ca605bf3eb094 ]

A caller of pm_genpd_init() that provides some states for the genpd via the
->states pointer in the struct generic_pm_domain, should also provide a
governor. This because it's the job of the governor to pick a state that
satisfies the constraints.

Therefore, let's print a warning to inform the user about such bogus
configuration and avoid to bail out, by instead picking the shallowest
state before genpd invokes the ->power_off() callback.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ulf Hansson 2018-10-03 16:38:15 +02:00 committed by Greg Kroah-Hartman
parent 830f3b829f
commit 7d704466f6
1 changed files with 6 additions and 0 deletions
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6
drivers/base/power/domain.c
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@ -369,6 +369,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
return -EAGAIN;
}
/* Default to shallowest state. */
if (!genpd->gov)
genpd->state_idx = 0;
if (genpd->power_off) {
int ret;
@ -1598,6 +1602,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
ret = genpd_set_default_power_state(genpd);
if (ret)
return ret;
} else if (!gov) {
pr_warn("%s : no governor for states\n", genpd->name);
}
mutex_lock(&gpd_list_lock);