Spacemit: fix high CPU load caused by rCPU remoteproc communication kthread

Signed-off-by: Sven-Ola Tuecke <sven-ola@gmx.de>

Author: sven-ola

patch/kernel/archive/spacemit-6.18/017-Spacemit-lower-kthread-loop-speed-to-1-sec.patch

@@ -24,7 +24,7 @@ index 8d0c318b5..deb4a8de7 100644
 
  	do {
 -		wait_for_completion_timeout(&mb->mb_comp, 10);
-+		wait_for_completion_timeout(&mb->mb_comp, msecs_to_jiffies(1000));
++		wait_for_completion_idle_timeout(&mb->mb_comp, 10);
  		if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
  			dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
  	} while (!kthread_should_stop());

patch/kernel/archive/spacemit-6.18/019-Add-a-wait_for_completion_idle_timeout-to-normalize-.patch

@@ -0,0 +1,47 @@
+From bfe1ecf46ad4f125703d01d23b292b80dfb22365 Mon Sep 17 00:00:00 2001
+From: Patrick Yavitz <pyavitz@gmail.com>
+Date: Wed, 4 Feb 2026 07:41:54 -0500
+Subject: [PATCH] Add a wait_for_completion_idle_timeout to normalize load avg
+
+Source: https://strl.cat/posts/2025/08/2025-08-07-qzowm
+
+Signed-off-by: Patrick Yavitz <pyavitz@gmail.com>
+---
+ include/linux/completion.h | 2 ++
+ kernel/sched/completion.c  | 7 +++++++
+ 2 files changed, 9 insertions(+)
+
+diff --git a/include/linux/completion.h b/include/linux/completion.h
+index fb2915676..c62abe10c 100644
+--- a/include/linux/completion.h
++++ b/include/linux/completion.h
+@@ -106,6 +106,8 @@ extern int wait_for_completion_killable(struct completion *x);
+ extern int wait_for_completion_state(struct completion *x, unsigned int state);
+ extern unsigned long wait_for_completion_timeout(struct completion *x,
+ 						   unsigned long timeout);
++extern unsigned long wait_for_completion_idle_timeout(struct completion *x,
++                                                  unsigned long timeout);
+ extern unsigned long wait_for_completion_io_timeout(struct completion *x,
+ 						    unsigned long timeout);
+ extern long wait_for_completion_interruptible_timeout(
+diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
+index 19ee70227..74e5dc660 100644
+--- a/kernel/sched/completion.c
++++ b/kernel/sched/completion.c
+@@ -173,6 +173,13 @@ wait_for_completion_timeout(struct completion *x, unsigned long timeout)
+ }
+ EXPORT_SYMBOL(wait_for_completion_timeout);
+ 
++unsigned long __sched
++wait_for_completion_idle_timeout(struct completion *x, unsigned long timeout)
++{
++       return wait_for_common(x, timeout, TASK_IDLE);
++}
++EXPORT_SYMBOL(wait_for_completion_idle_timeout);
++
+ /**
+  * wait_for_completion_io: - waits for completion of a task
+  * @x:  holds the state of this particular completion
+-- 
+2.51.0
+