Patch "arm64: dts: juno: fix cluster sleep state entry latency on all SoC versions" has been added to the 4.8-stable tree

Patch "arm64: dts: juno: fix cluster sleep state entry latency on all SoC versions" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: dts: juno: fix cluster sleep state entry latency on all SoC versions

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-dts-juno-fix-cluster-sleep-state-entry-latency-on-all-soc-versions.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 909e481e2467f202b97d42beef246e8829416a85 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Wed, 16 Nov 2016 17:31:31 +0000
Subject: arm64: dts: juno: fix cluster sleep state entry latency on all SoC versions

From: Sudeep Holla <sudeep.holla@arm.com>

commit 909e481e2467f202b97d42beef246e8829416a85 upstream.

The core and the cluster sleep state entry latencies can't be same as
cluster sleep involves more work compared to core level e.g. shared
cache maintenance.

Experiments have shown on an average about 100us more latency for the
cluster sleep state compared to the core level sleep. This patch fixes
the entry latency for the cluster sleep state.

Fixes: 28e10a8f3a03 ("arm64: dts: juno: Add idle-states to device tree")
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "Jon Medhurst (Tixy)" <tixy@linaro.org>
Reviewed-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/boot/dts/arm/juno-r1.dts |    2 +-
 arch/arm64/boot/dts/arm/juno-r2.dts |    2 +-
 arch/arm64/boot/dts/arm/juno.dts    |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

--- a/arch/arm64/boot/dts/arm/juno-r1.dts
+++ b/arch/arm64/boot/dts/arm/juno-r1.dts
@@ -76,7 +76,7 @@
 				compatible = "arm,idle-state";
 				arm,psci-suspend-param = <0x1010000>;
 				local-timer-stop;
-				entry-latency-us = <300>;
+				entry-latency-us = <400>;
 				exit-latency-us = <1200>;
 				min-residency-us = <2500>;
 			};
--- a/arch/arm64/boot/dts/arm/juno-r2.dts
+++ b/arch/arm64/boot/dts/arm/juno-r2.dts
@@ -76,7 +76,7 @@
 				compatible = "arm,idle-state";
 				arm,psci-suspend-param = <0x1010000>;
 				local-timer-stop;
-				entry-latency-us = <300>;
+				entry-latency-us = <400>;
 				exit-latency-us = <1200>;
 				min-residency-us = <2500>;
 			};
--- a/arch/arm64/boot/dts/arm/juno.dts
+++ b/arch/arm64/boot/dts/arm/juno.dts
@@ -76,7 +76,7 @@
 				compatible = "arm,idle-state";
 				arm,psci-suspend-param = <0x1010000>;
 				local-timer-stop;
-				entry-latency-us = <300>;
+				entry-latency-us = <400>;
 				exit-latency-us = <1200>;
 				min-residency-us = <2500>;
 			};


Patches currently in stable-queue which might be from sudeep.holla@arm.com are

queue-4.8/arm64-dts-juno-fix-cluster-sleep-state-entry-latency-on-all-soc-versions.patch