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[v8,02/26] PM / Domains: Deal with multiple states but no governor in genpd

Message ID 20180620172226.15012-3-ulf.hansson@linaro.org
State Superseded
Headers show
Series PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) | expand

Commit Message

Ulf Hansson June 20, 2018, 5:22 p.m. UTC
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.

Cc: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Reviewed-by: Lina Iyer <ilina@codeaurora.org>

 drivers/base/power/domain.c | 6 ++++++
 1 file changed, 6 insertions(+)

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diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 62969c3d5d04..21d298e1820b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -467,6 +467,10 @@  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;
@@ -1687,6 +1691,8 @@  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);