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soc: apple: rtkit: Add apple_rtkit_idle() function

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This is yet another low power mode, used by DCP.

Reviewed-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2023-01-23 15:53:54 +09:00
parent 1b929c02af
commit 40eaa8c0cb
2 changed files with 26 additions and 0 deletions
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21
drivers/soc/apple/rtkit.c
View file

@ -9,6 +9,7 @@
enum {
APPLE_RTKIT_PWR_STATE_OFF = 0x00, /* power off, cannot be restarted */
APPLE_RTKIT_PWR_STATE_SLEEP = 0x01, /* sleeping, can be restarted */
APPLE_RTKIT_PWR_STATE_IDLE = 0x201, /* sleeping, retain state */
APPLE_RTKIT_PWR_STATE_QUIESCED = 0x10, /* running but no communication */
APPLE_RTKIT_PWR_STATE_ON = 0x20, /* normal operating state */
};
@ -881,6 +882,26 @@ int apple_rtkit_shutdown(struct apple_rtkit *rtk)
}
EXPORT_SYMBOL_GPL(apple_rtkit_shutdown);
int apple_rtkit_idle(struct apple_rtkit *rtk)
{
int ret;
/* if OFF is used here the co-processor will not wake up again */
ret = apple_rtkit_set_ap_power_state(rtk,
APPLE_RTKIT_PWR_STATE_IDLE);
if (ret)
return ret;
ret = apple_rtkit_set_iop_power_state(rtk, APPLE_RTKIT_PWR_STATE_IDLE);
if (ret)
return ret;
rtk->iop_power_state = APPLE_RTKIT_PWR_STATE_IDLE;
rtk->ap_power_state = APPLE_RTKIT_PWR_STATE_IDLE;
return 0;
}
EXPORT_SYMBOL_GPL(apple_rtkit_idle);
int apple_rtkit_quiesce(struct apple_rtkit *rtk)
{
int ret;

5
include/linux/soc/apple/rtkit.h
View file

@ -104,6 +104,11 @@ int apple_rtkit_wake(struct apple_rtkit *rtk);
*/
int apple_rtkit_shutdown(struct apple_rtkit *rtk);
/*
* Put the co-processor into idle mode
*/
int apple_rtkit_idle(struct apple_rtkit *rtk);
/*
* Checks if RTKit is running and ready to handle messages.
*/