Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) What:		/sys/devices/.../power/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) Date:		January 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 		The /sys/devices/.../power directory contains attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 		allowing the user space to check and modify some power
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 		management related properties of given device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) What:		/sys/devices/.../power/wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) Date:		January 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 		The /sys/devices/.../power/wakeup attribute allows the user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 		space to check if the device is enabled to wake up the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 		from sleep states, such as the memory sleep state (suspend to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 		RAM) and hibernation (suspend to disk), and to enable or disable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 		it to do that as desired.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 		Some devices support "wakeup" events, which are hardware signals
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 		used to activate the system from a sleep state.  Such devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		have one of the following two values for the sysfs power/wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		file:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		+ "enabled\n" to issue the events;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		+ "disabled\n" not to do so;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		In that cases the user space can change the setting represented
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		by the contents of this file by writing either "enabled", or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		"disabled" to it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		For the devices that are not capable of generating system wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		events this file is not present.  In that case the device cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		be enabled to wake up the system from sleep states.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) What:		/sys/devices/.../power/control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) Date:		January 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		The /sys/devices/.../power/control attribute allows the user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		space to control the run-time power management of the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		All devices have one of the following two values for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		power/control file:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		+ "auto\n" to allow the device to be power managed at run time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		+ "on\n" to prevent the device from being power managed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		The default for all devices is "auto", which means that they may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		be subject to automatic power management, depending on their
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		drivers.  Changing this attribute to "on" prevents the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		from power managing the device at run time.  Doing that while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		the device is suspended causes it to be woken up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) What:		/sys/devices/.../power/async
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) Date:		January 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		The /sys/devices/.../async attribute allows the user space to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		enable or diasble the device's suspend and resume callbacks to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		be executed asynchronously (ie. in separate threads, in parallel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		with the main suspend/resume thread) during system-wide power
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		transitions (eg. suspend to RAM, hibernation).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		All devices have one of the following two values for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		power/async file:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		+ "enabled\n" to permit the asynchronous suspend/resume;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		+ "disabled\n" to forbid it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		The value of this attribute may be changed by writing either
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		"enabled", or "disabled" to it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		It generally is unsafe to permit the asynchronous suspend/resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		of a device unless it is certain that all of the PM dependencies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		of the device are known to the PM core.  However, for some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		devices this attribute is set to "enabled" by bus type code or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		device drivers and in that cases it should be safe to leave the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		default value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) What:		/sys/devices/.../power/wakeup_count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		The /sys/devices/.../wakeup_count attribute contains the number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		of signaled wakeup events associated with the device.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		attribute is read-only.  If the device is not capable to wake up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		the system from sleep states, this attribute is not present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		If the device is not enabled to wake up the system from sleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) What:		/sys/devices/.../power/wakeup_active_count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		The /sys/devices/.../wakeup_active_count attribute contains the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		number of times the processing of wakeup events associated with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		the device was completed (at the kernel level).  This attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		is read-only.  If the device is not capable to wake up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		system from sleep states, this attribute is not present.  If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		the device is not enabled to wake up the system from sleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) What:		/sys/devices/.../power/wakeup_abort_count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) Date:		February 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		The /sys/devices/.../wakeup_abort_count attribute contains the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		number of times the processing of a wakeup event associated with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		the device might have aborted system transition into a sleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		state in progress.  This attribute is read-only.  If the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		is not capable to wake up the system from sleep states, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		attribute is not present.  If the device is not enabled to wake
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		up the system from sleep states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) What:		/sys/devices/.../power/wakeup_expire_count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) Date:		February 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		The /sys/devices/.../wakeup_expire_count attribute contains the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		number of times a wakeup event associated with the device has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		been reported with a timeout that expired.  This attribute is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		read-only.  If the device is not capable to wake up the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		from sleep states, this attribute is not present.  If the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		device is not enabled to wake up the system from sleep states,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) What:		/sys/devices/.../power/wakeup_active
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		The /sys/devices/.../wakeup_active attribute contains either 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		or 0, depending on whether or not a wakeup event associated with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		the device is being processed (1).  This attribute is read-only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		If the device is not capable to wake up the system from sleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		states, this attribute is not present.  If the device is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		enabled to wake up the system from sleep states, this attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) What:		/sys/devices/.../power/wakeup_total_time_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		The /sys/devices/.../wakeup_total_time_ms attribute contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		the total time of processing wakeup events associated with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		device, in milliseconds.  This attribute is read-only.  If the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		device is not capable to wake up the system from sleep states,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		this attribute is not present.  If the device is not enabled to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		wake up the system from sleep states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) What:		/sys/devices/.../power/wakeup_max_time_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		The /sys/devices/.../wakeup_max_time_ms attribute contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		the maximum time of processing a single wakeup event associated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		with the device, in milliseconds.  This attribute is read-only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		If the device is not capable to wake up the system from sleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		states, this attribute is not present.  If the device is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		enabled to wake up the system from sleep states, this attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) What:		/sys/devices/.../power/wakeup_last_time_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		The /sys/devices/.../wakeup_last_time_ms attribute contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		the value of the monotonic clock corresponding to the time of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		signaling the last wakeup event associated with the device, in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		milliseconds.  This attribute is read-only.  If the device is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		not enabled to wake up the system from sleep states, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		attribute is not present.  If the device is not enabled to wake
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		up the system from sleep states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) What:		/sys/devices/.../power/wakeup_prevent_sleep_time_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) Date:		February 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		The /sys/devices/.../wakeup_prevent_sleep_time_ms attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		contains the total time the device has been preventing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		opportunistic transitions to sleep states from occurring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		This attribute is read-only.  If the device is not capable to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		wake up the system from sleep states, this attribute is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		present.  If the device is not enabled to wake up the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		from sleep states, this attribute is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) What:		/sys/devices/.../power/autosuspend_delay_ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) Date:		September 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) Contact:	Alan Stern <stern@rowland.harvard.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		The /sys/devices/.../power/autosuspend_delay_ms attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		contains the autosuspend delay value (in milliseconds).  Some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		drivers do not want their device to suspend as soon as it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		becomes idle at run time; they want the device to remain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		inactive for a certain minimum period of time first.  That
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		period is called the autosuspend delay.  Negative values will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		prevent the device from being suspended at run time (similar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		to writing "on" to the power/control attribute).  Values >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		1000 will cause the autosuspend timer expiration to be rounded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		up to the nearest second.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		Not all drivers support this attribute.  If it isn't supported,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		attempts to read or write it will yield I/O errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) What:		/sys/devices/.../power/pm_qos_resume_latency_us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) Date:		March 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		The /sys/devices/.../power/pm_qos_resume_latency_us attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		contains the PM QoS resume latency limit for the given device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		which is the maximum allowed time it can take to resume the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		device, after it has been suspended at run time, from a resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		request to the moment the device will be ready to process I/O,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		in microseconds.  If it is equal to 0, however, this means that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		the PM QoS resume latency may be arbitrary and the special value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		"n/a" means that user space cannot accept any resume latency at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		all for the given device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		Not all drivers support this attribute.  If it isn't supported,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		it is not present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		This attribute has no effect on system-wide suspend/resume and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		hibernation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) What:		/sys/devices/.../power/pm_qos_latency_tolerance_us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) Date:		January 2014
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		The /sys/devices/.../power/pm_qos_latency_tolerance_us attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		contains the PM QoS active state latency tolerance limit for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		given device in microseconds.  That is the maximum memory access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		latency the device can suffer without any visible adverse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		effects on user space functionality.  If that value is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		string "any", the latency does not matter to user space at all,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		but hardware should not be allowed to set the latency tolerance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		for the device automatically.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		Reading "auto" from this file means that the maximum memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		access latency for the device may be determined automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		by the hardware as needed.  Writing "auto" to it allows the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		hardware to be switched to this mode if there are no other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		latency tolerance requirements from the kernel side.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		This attribute is only present if the feature controlled by it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		is supported by the hardware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		This attribute has no effect on runtime suspend and resume of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		devices and on system-wide suspend/resume and hibernation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) What:		/sys/devices/.../power/pm_qos_no_power_off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) Date:		September 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		The /sys/devices/.../power/pm_qos_no_power_off attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		is used for manipulating the PM QoS "no power off" flag.  If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		set, this flag indicates to the kernel that power should not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		be removed entirely from the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		Not all drivers support this attribute.  If it isn't supported,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		it is not present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		This attribute has no effect on system-wide suspend/resume and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		hibernation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) What:		/sys/devices/.../power/runtime_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) Date:		April 2010
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		The /sys/devices/.../power/runtime_status attribute contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		the current runtime PM status of the device, which may be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		"suspended", "suspending", "resuming", "active", "error" (fatal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		error), or "unsupported" (runtime PM is disabled).