Commit ba99035b authored by Sven Peter's avatar Sven Peter
Browse files

soc: apple: rtkit: Add function to poweroff 



Add a function to put a co-processor into the lowest possible power
state from which recovery usually isn't possible without a full SoC
reset. This is required for the USB4/Thunderbolt co-processors which
can be restarted since the entire USB4 root complex can be completely
reset independently of the rest of the SoC.

Reviewed-by: default avatarJanne Grunau <j@jannau.net>
Link: https://patch.msgid.link/20260117-apple-rtkit-poweroff-v2-1-b882a180e44d@kernel.org


Signed-off-by: default avatarSven Peter <sven@kernel.org>
parent 8f0b4cce

drivers/soc/apple/rtkit.c

+16 −0
Original line number Diff line number Diff line
@@ -851,6 +851,22 @@ int apple_rtkit_shutdown(struct apple_rtkit *rtk) 
}

EXPORT_SYMBOL_GPL(apple_rtkit_shutdown);



int apple_rtkit_poweroff(struct apple_rtkit *rtk)

{

	int ret;



	ret = apple_rtkit_set_ap_power_state(rtk, APPLE_RTKIT_PWR_STATE_OFF);

	if (ret)

		return ret;



	ret = apple_rtkit_set_iop_power_state(rtk, APPLE_RTKIT_PWR_STATE_OFF);

	if (ret)

		return ret;



	return apple_rtkit_reinit(rtk);

}

EXPORT_SYMBOL_GPL(apple_rtkit_poweroff);



int apple_rtkit_idle(struct apple_rtkit *rtk)

{

	int ret;

include/linux/soc/apple/rtkit.h

+7 −0
Original line number Diff line number Diff line
@@ -125,6 +125,13 @@ int apple_rtkit_wake(struct apple_rtkit *rtk); 
 */

int apple_rtkit_shutdown(struct apple_rtkit *rtk);



/*

 * Put the co-processor into the lowest power state. Note that it usually

 * is not possible to recover from this state without a full SoC reset.

 */



int apple_rtkit_poweroff(struct apple_rtkit *rtk);



/*

 * Put the co-processor into idle mode

 */