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Upstream commits 43b68879de27b1993518687fbc6013da80cdcbfe and ce6031c89a35cffd5a5992b08377b77f49a004b9 improve the cpuidle driver on Armada XP. The latter commit improves performance at the slight expense of power consumption.

Browse source 
Signed-off-by: Claudio Leite <leitec@staticky.com>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

SVN-Revision: 45294
This commit is contained in:
Imre Kaloz 2015-04-07 18:13:51 +00:00
parent 503d845522
commit f60fea1923
2 changed files with 104 additions and 0 deletions
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38
target/linux/mvebu/patches-3.18/060-cpuidle-mvebu-Fix-the-CPU-PM-notifier-usage.patch Normal file
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@ -0,0 +1,38 @@
From 43b68879de27b1993518687fbc6013da80cdcbfe Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
Date: Thu, 26 Feb 2015 18:20:48 +0100
Subject: [PATCH] cpuidle: mvebu: Fix the CPU PM notifier usage
As stated in kernel/cpu_pm.c, "Platform is responsible for ensuring
that cpu_pm_enter is not called twice on the same CPU before
cpu_pm_exit is called.". In the current code in case of failure when
calling mvebu_v7_cpu_suspend, the function cpu_pm_exit() is never
called whereas cpu_pm_enter() was called just before.
This patch moves the cpu_pm_exit() in order to balance the
cpu_pm_enter() calls.
Cc: stable@vger.kernel.org
Reported-by: Fulvio Benini <fbf@libero.it>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/cpuidle/cpuidle-mvebu-v7.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/cpuidle/cpuidle-mvebu-v7.c
+++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
@@ -37,11 +37,11 @@ static int mvebu_v7_enter_idle(struct cp
deepidle = true;
ret = mvebu_v7_cpu_suspend(deepidle);
+ cpu_pm_exit();
+
if (ret)
return ret;
- cpu_pm_exit();
-
return index;
}

66
target/linux/mvebu/patches-3.18/061-cpuidle-mvebu-Update-cpuidle-thresholds-for-Armada-X.patch Normal file
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@ -0,0 +1,66 @@
From ce6031c89a35cffd5a5992b08377b77f49a004b9 Mon Sep 17 00:00:00 2001
From: Sebastien Rannou <mxs@sbrk.org>
Date: Fri, 13 Feb 2015 15:55:03 +0100
Subject: [PATCH] cpuidle: mvebu: Update cpuidle thresholds for Armada XP SOCs
Originally, the thresholds used in the cpuidle driver for Armada SOCs
were temporarily chosen, leaving room for improvements.
This commit updates the thresholds for the Armada XP SOCs with values
that positively impact performances:
without patch with patch vendor kernel
- iperf localhost (gbit/sec) ~3.7 ~6.4 ~5.4
- ioping tmpfs (iops) ~163k ~206k ~179k
- ioping tmpfs (mib/s) ~636 ~805 ~699
The idle power consumption is negatively impacted (proportionally less
than the performance gain), and we are still performing better than
the vendor kernel here:
without patch with patch vendor kernel
- power consumption idle (W) ~2.4 ~3.2 ~4.4
- power consumption busy (W) ~8.6 ~8.3 ~8.6
There is still room for improvement regarding the value of these
thresholds, they were chosen to mimic the vendor kernel.
This patch only impacts Armada XP SOCs and was tested on Online Labs
C1 boards. A similar approach can be taken to improve the performances
of the Armada 370 and Armada 38x SOCs.
Thanks a lot to Thomas Petazzoni, Gregory Clement and Willy Tarreau
for the discussions and tips around this topic.
Signed-off-by: Sebastien Rannou <mxs@sbrk.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
drivers/cpuidle/cpuidle-mvebu-v7.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/cpuidle/cpuidle-mvebu-v7.c
+++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
@@ -50,18 +50,18 @@ static struct cpuidle_driver armadaxp_id
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.enter = mvebu_v7_enter_idle,
- .exit_latency = 10,
+ .exit_latency = 100,
.power_usage = 50,
- .target_residency = 100,
+ .target_residency = 1000,
.flags = CPUIDLE_FLAG_TIME_VALID,
.name = "MV CPU IDLE",
.desc = "CPU power down",
},
.states[2] = {
.enter = mvebu_v7_enter_idle,
- .exit_latency = 100,
+ .exit_latency = 1000,
.power_usage = 5,
- .target_residency = 1000,
+ .target_residency = 10000,
.flags = CPUIDLE_FLAG_TIME_VALID |
MVEBU_V7_FLAG_DEEP_IDLE,
.name = "MV CPU DEEP IDLE",