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[v4,6/8] PM / sleep: Define constant for direct_complete

Message ID bc77efb7da66b7c81c751a4b07f3b306e6dcba8f.1483806825.git.lukas@wunner.de (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Lukas Wunner Jan. 8, 2017, 8:41 a.m. UTC 
From: Chen Yu <yu.c.chen@intel.com>

The PM core introduced the ability to keep devices runtime suspended
during the entire system sleep process with commit aae4518b3124
("PM / sleep: Mechanism to avoid resuming runtime-suspended devices
unnecessarily").

Drivers opt in to this so-called "direct_complete" mechanism by
returning a positive value from their ->prepare hook.  Usually this is
achieved with a "return 1;" statement, which looks somewhat cryptic to
readers not intimately familiar with the PM core.

Improve clarity by defining a DPM_DIRECT_COMPLETE constant which drivers
may use instead.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
[LW: separate this hunk out of mfd patch, add commit message]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 include/linux/pm.h | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox

Patch

diff --git a/include/linux/pm.h b/include/linux/pm.h
index f926af4..2d651a3 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -788,4 +788,11 @@  enum dpm_order {
 	DPM_ORDER_DEV_LAST,
 };
 
+/*
+ * Return this from system suspend/hibernation ->prepare() callback to
+ * request the core to leave the device runtime-suspended during system
+ * suspend if possible.
+ */
+#define DPM_DIRECT_COMPLETE 1
+
 #endif /* _LINUX_PM_H */