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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-10-26 13:12:08 +0300 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-11-06 15:57:01 +0300 |
commit | 0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f (patch) | |
tree | 28017e02257ab291f966247ad61d37e670c0a320 /include/linux/pm.h | |
parent | c2eac4d3a115e2f511844e7bcf73f4e877fbf5da (diff) | |
download | linux-0eab11c9ae3b3cc5dd76f20b81d0247647a6e96f.tar.xz |
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.h | 8 |
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; |