From 40eaa8c0cbba4a27668c7e01373ccd5b38381e2f Mon Sep 17 00:00:00 2001
From: Hector Martin <marcan@marcan.st>
Date: Mon, 23 Jan 2023 15:53:54 +0900
Subject: [PATCH] soc: apple: rtkit: Add apple_rtkit_idle() function
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>
---
drivers/soc/apple/rtkit.c | 21 +++++++++++++++++++++
include/linux/soc/apple/rtkit.h | 5 +++++
2 files changed, 26 insertions(+)
diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index 8ec74d7539eb..efb1fa77dff2 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -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;
diff --git a/include/linux/soc/apple/rtkit.h b/include/linux/soc/apple/rtkit.h
index c9cabb679cd1..a2446b45ed7f 100644
--- a/include/linux/soc/apple/rtkit.h
+++ b/include/linux/soc/apple/rtkit.h
@@ -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.
*/