diff options
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0092-cpufreq-schedutil-Use-policy-dependent-transition-de.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0092-cpufreq-schedutil-Use-policy-dependent-transition-de.patch | 93 |
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 + |