PM: domains: Fix handling of unavailable/disabled idle states

[ Upstream commit e0c57a5c70c13317238cb19a7ded0eab4a5f7de5 ]

Platforms can provide the information about the availability of each
idle states via status flag. Platforms may have to disable one or more
idle states for various reasons like broken firmware or other unmet
dependencies.

Fix handling of such unavailable/disabled idle states by ignoring them
while parsing the states.

Fixes: a3381e3a65cb ("PM / domains: Fix up domain-idle-states OF parsing")
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 7f3d21e..94fe30c 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2889,6 +2889,10 @@ static int genpd_iterate_idle_states(struct device_node *dn,
                np = it.node;
                if (!of_match_node(idle_state_match, np))
                        continue;
+
+               if (!of_device_is_available(np))
+                       continue;
+
                if (states) {
                        ret = genpd_parse_state(&states[i], np);
                        if (ret) {