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authorRafael J. Wysocki <rjw@sisk.pl>2011-08-09 01:43:29 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2011-08-25 17:33:44 +0400
commit3f241775c30365c33a0d2f6d40f4cf12470f48c6 (patch)
tree45b3fa3b5da4d9cbb006762118dcd0f8837434ff /include/linux/pm_domain.h
parent9e08cf429697090d0fac57d493dc7b6de17a5eee (diff)
downloadlinux-3f241775c30365c33a0d2f6d40f4cf12470f48c6.tar.xz
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 <rjw@sisk.pl>
Diffstat (limited to 'include/linux/pm_domain.h')
-rw-r--r--include/linux/pm_domain.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 81c5782d90a3..97e3f8eb4978 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 */