From 3f241775c30365c33a0d2f6d40f4cf12470f48c6 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 8 Aug 2011 23:43:29 +0200 Subject: PM / Domains: Add "wait for parent" status for generic PM domains The next patch will make it possible for a generic PM domain to have multiple parents (i.e. multiple PM domains it depends on). To prepare for that change it is necessary to change pm_genpd_poweron() so that it doesn't jump to the start label after running itself recursively for the parent domain. For this purpose, introduce a new PM domain status value GPD_STATE_WAIT_PARENT that will be set by pm_genpd_poweron() before calling itself recursively for the parent domain and modify the code in drivers/base/power/domain.c so that the GPD_STATE_WAIT_PARENT status is guaranteed to be preserved during the execution of pm_genpd_poweron() for the parent. This change also causes pm_genpd_add_subdomain() and pm_genpd_remove_subdomain() to wait for started pm_genpd_poweron() to complete and allows pm_genpd_runtime_resume() to avoid dropping the lock after powering on the PM domain. Signed-off-by: Rafael J. Wysocki --- include/linux/pm_domain.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 81c5782d90a..97e3f8eb497 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -13,6 +13,7 @@ enum gpd_status { GPD_STATE_ACTIVE = 0, /* PM domain is active */ + GPD_STATE_WAIT_PARENT, /* PM domain's parent is being waited for */ GPD_STATE_BUSY, /* Something is happening to the PM domain */ GPD_STATE_REPEAT, /* Power off in progress, to be repeated */ GPD_STATE_POWER_OFF, /* PM domain is off */ -- cgit v1.2.3-70-g09d2