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: Janne Grunau <j@jannau.net>
Link: https://patch.msgid.link/20260117-apple-rtkit-poweroff-v2-1-b882a180e44d@kernel.org
Signed-off-by: Sven Peter <sven@kernel.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index b8d4da147d23..4ad4f964fde7 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -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;