This layer provides Energy Aware Scheduling (EAS) patcheseel_5.1.0eel_5.0.3eel_5.0.2eel/5.1.0eel/5.0.3eel/5.0.25.1.05.0.35.0.2eel

For the moment only for Renesas R-Car Gen3 SoC's.
Can be expanded for other SoC's by setting the machine
feature biglittle and provide the relevant EAS patches.

Bug-AGL: SPEC-813

Change-Id: I2b5e69c515c33e57be19b30466fe208d7b8ac1a5
Signed-off-by: Frode Isaksen <fisaksen@baylibre.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0092-cpufreq-schedutil-Use-policy-dependent-transition-de.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0092-cpufreq-schedutil-Use-policy-dependent-transition-de.patch
new file mode 100644
index 0000000..29fdd5c
--- /dev/null
+++ b/meta-eas/recipes-kernel/linux/linux-renesas/0092-cpufreq-schedutil-Use-policy-dependent-transition-de.patch
@@ -0,0 +1,93 @@
+From fd991617b51a628a72bdb45b20fbc5c01d666b70 Mon Sep 17 00:00:00 2001
+From: Gaku Inami <gaku.inami.xw@bp.renesas.com>
+Date: Fri, 7 Jul 2017 15:04:31 +0900
+Subject: [PATCH 92/92] cpufreq: schedutil: Use policy-dependent transition
+ delays for R-Car
+
+Make the schedutil governor take the initial (default) value of the
+rate_limit_us sysfs attribute from the (new) transition_delay_us
+policy parameter (to be set by the scaling driver).
+
+That will allow scaling drivers to make schedutil use smaller default
+values of rate_limit_us and reduce the default average time interval
+between consecutive frequency changes.
+
+The cpufreq-dt driver for R-Car H3/M3 set transition_delay_us to value
+same as transition_latency.
+
+Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
+---
+ drivers/cpufreq/cpufreq-dt.c     |  4 ++++
+ include/linux/cpufreq.h          |  7 +++++++
+ kernel/sched/cpufreq_schedutil.c | 15 ++++++++++-----
+ 3 files changed, 21 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
+index 5c07ae0..57cd54e 100644
+--- a/drivers/cpufreq/cpufreq-dt.c
++++ b/drivers/cpufreq/cpufreq-dt.c
+@@ -276,6 +276,10 @@ static int cpufreq_init(struct cpufreq_policy *policy)
+ 
+ 	policy->cpuinfo.transition_latency = transition_latency;
+ 
++#if IS_ENABLED(CONFIG_ARCH_R8A7795) || IS_ENABLED(CONFIG_ARCH_R8A7796)
++	policy->transition_delay_us = transition_latency;
++#endif
++
+ 	return 0;
+ 
+ out_free_cpufreq_table:
+diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
+index 32dc0cbd..7df5d88 100644
+--- a/include/linux/cpufreq.h
++++ b/include/linux/cpufreq.h
+@@ -120,6 +120,13 @@ struct cpufreq_policy {
+ 	bool			fast_switch_possible;
+ 	bool			fast_switch_enabled;
+ 
++	/*
++	 * Preferred average time interval between consecutive invocations of
++	 * the driver to set the frequency for this policy.  To be set by the
++	 * scaling driver (0, which is the default, means no preference).
++	 */
++	unsigned int		transition_delay_us;
++
+ 	 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
+ 	unsigned int cached_target_freq;
+ 	int cached_resolved_idx;
+diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
+index 42a220e..9668e0e 100644
+--- a/kernel/sched/cpufreq_schedutil.c
++++ b/kernel/sched/cpufreq_schedutil.c
+@@ -473,7 +473,6 @@ static int sugov_init(struct cpufreq_policy *policy)
+ {
+ 	struct sugov_policy *sg_policy;
+ 	struct sugov_tunables *tunables;
+-	unsigned int lat;
+ 	int ret = 0;
+ 
+ 	/* State should be equivalent to EXIT */
+@@ -512,10 +511,16 @@ static int sugov_init(struct cpufreq_policy *policy)
+ 		goto stop_kthread;
+ 	}
+ 
+-	tunables->rate_limit_us = LATENCY_MULTIPLIER;
+-	lat = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
+-	if (lat)
+-		tunables->rate_limit_us *= lat;
++	if (policy->transition_delay_us) {
++		tunables->rate_limit_us = policy->transition_delay_us;
++	} else {
++		unsigned int lat;
++
++		tunables->rate_limit_us = LATENCY_MULTIPLIER;
++		lat = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
++		if (lat)
++			tunables->rate_limit_us *= lat;
++	}
+ 
+ 	policy->governor_data = sg_policy;
+ 	sg_policy->tunables = tunables;
+-- 
+1.9.1
+