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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-26 12:12:08 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-06 13:57:01 +0100
commit0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f (patch)
tree28017e02257ab291f966247ad61d37e670c0a320 /include/linux/pm.h
parentc2eac4d3a115e2f511844e7bcf73f4e877fbf5da (diff)
downloadlwn-0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f.tar.gz
lwn-0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f.zip
PM / core: Add SMART_SUSPEND driver flag
Define and document a SMART_SUSPEND flag to instruct bus types and PM domains that the system suspend callbacks provided by the driver can cope with runtime-suspended devices, so from the driver's perspective it should be safe to leave devices in runtime suspend during system suspend. Setting that flag may also cause middle-layer code (bus types, PM domains etc.) to skip invocations of the ->suspend_late and ->suspend_noirq callbacks provided by the driver if the device is in runtime suspend at the beginning of the "late" phase of the system-wide suspend transition, in which case the driver's system-wide resume callbacks may be invoked back-to-back with its ->runtime_suspend callback, so the driver has to be able to cope with that too. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'include/linux/pm.h')
-rw-r--r--include/linux/pm.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h
index f10bad831bfa..43b5418e05bb 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -558,6 +558,7 @@ struct pm_subsys_data {
*
* NEVER_SKIP: Do not skip system suspend/resume callbacks for the device.
* SMART_PREPARE: Check the return value of the driver's ->prepare callback.
+ * SMART_SUSPEND: No need to resume the device from runtime suspend.
*
* Setting SMART_PREPARE instructs bus types and PM domains which may want
* system suspend/resume callbacks to be skipped for the device to return 0 from
@@ -565,9 +566,16 @@ struct pm_subsys_data {
* other words, the system suspend/resume callbacks can only be skipped for the
* device if its driver doesn't object against that). This flag has no effect
* if NEVER_SKIP is set.
+ *
+ * Setting SMART_SUSPEND instructs bus types and PM domains which may want to
+ * runtime resume the device upfront during system suspend that doing so is not
+ * necessary from the driver's perspective. It also may cause them to skip
+ * invocations of the ->suspend_late and ->suspend_noirq callbacks provided by
+ * the driver if they decide to leave the device in runtime suspend.
*/
#define DPM_FLAG_NEVER_SKIP BIT(0)
#define DPM_FLAG_SMART_PREPARE BIT(1)
+#define DPM_FLAG_SMART_SUSPEND BIT(2)
struct dev_pm_info {
pm_message_t power_state;