Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+23
+16
drivers/soc/apple/rtkit.c
+16
drivers/soc/apple/rtkit.c
···
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}
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EXPORT_SYMBOL_GPL(apple_rtkit_shutdown);
853
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854
+
int apple_rtkit_poweroff(struct apple_rtkit *rtk)
855
+
{
856
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int ret;
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+
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ret = apple_rtkit_set_ap_power_state(rtk, APPLE_RTKIT_PWR_STATE_OFF);
859
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if (ret)
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return ret;
861
+
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ret = apple_rtkit_set_iop_power_state(rtk, APPLE_RTKIT_PWR_STATE_OFF);
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if (ret)
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return ret;
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+
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return apple_rtkit_reinit(rtk);
867
+
}
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EXPORT_SYMBOL_GPL(apple_rtkit_poweroff);
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+
854
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int apple_rtkit_idle(struct apple_rtkit *rtk)
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871
{
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int ret;
+7
include/linux/soc/apple/rtkit.h
+7
include/linux/soc/apple/rtkit.h
···
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int apple_rtkit_shutdown(struct apple_rtkit *rtk);
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/*
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+
* Put the co-processor into the lowest power state. Note that it usually
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+
* is not possible to recover from this state without a full SoC reset.
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*/
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+
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int apple_rtkit_poweroff(struct apple_rtkit *rtk);
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+
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/*
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* Put the co-processor into idle mode
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*/
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int apple_rtkit_idle(struct apple_rtkit *rtk);