mvebu: 6.6: copy files, patches & configs from 6.1

[openwrt/openwrt.git] / target / linux / mvebu / patches-6.6 / 800-cpuidle-mvebu-indicate-failure-to-enter-deeper-sleep.patch

diff --git a/target/linux/mvebu/patches-6.6/800-cpuidle-mvebu-indicate-failure-to-enter-deeper-sleep.patch b/target/linux/mvebu/patches-6.6/800-cpuidle-mvebu-indicate-failure-to-enter-deeper-sleep.patch
new file mode 100644 (file)
index 0000000..29f36be
--- /dev/null
+++ b/target/linux/mvebu/patches-6.6/800-cpuidle-mvebu-indicate-failure-to-enter-deeper-sleep.patch
@@ -0,0 +1,40 @@
+From c28b2d367da8a471482e6a4aa8337ab6369a80c2 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@arm.linux.org.uk>
+Date: Sat, 3 Oct 2015 09:13:05 +0100
+Subject: cpuidle: mvebu: indicate failure to enter deeper sleep states
+
+The cpuidle ->enter method expects the return value to be the sleep
+state we entered.  Returning negative numbers or other codes is not
+permissible since coupled CPU idle was merged.
+
+At least some of the mvebu_v7_cpu_suspend() implementations return the
+value from cpu_suspend(), which returns zero if the CPU vectors back
+into the kernel via cpu_resume() (the success case), or the non-zero
+return value of the suspend actor, or one (failure cases).
+
+We do not want to be returning the failure case value back to CPU idle
+as that indicates that we successfully entered one of the deeper idle
+states.  Always return zero instead, indicating that we slept for the
+shortest amount of time.
+
+Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
+---
+ drivers/cpuidle/cpuidle-mvebu-v7.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/cpuidle/cpuidle-mvebu-v7.c
++++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
+@@ -39,8 +39,12 @@ static int mvebu_v7_enter_idle(struct cp
+       ret = mvebu_v7_cpu_suspend(deepidle);
+       cpu_pm_exit();
+ 
++      /*
++       * If we failed to enter the desired state, indicate that we
++       * slept lightly.
++       */
+       if (ret)
+-              return ret;
++              return 0;
+ 
+       return index;
+ }