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e948bc8fbe
linux/drivers/cpufreq
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Viresh Kumar e948bc8fbe cpufreq: Cap the default transition delay value to 10 ms 
If transition_delay_us isn't defined by the cpufreq driver, the default
value of transition delay (time after which the cpufreq governor will
try updating the frequency again) is currently calculated by multiplying
transition_latency (nsec) with LATENCY_MULTIPLIER (1000) and then
converting this time to usec. That gives the exact same value as
transition_latency, just that the time unit is usec instead of nsec.

With acpi-cpufreq for example, transition_latency is set to around 10
usec and we get transition delay as 10 ms. Which seems to be a
reasonable amount of time to reevaluate the frequency again.

But for platforms where frequency switching isn't that fast (like ARM),
the transition_latency varies from 500 usec to 3 ms, and the transition
delay becomes 500 ms to 3 seconds. Of course, that is a pretty bad
default value to start with.

We can try to come across a better formula (instead of multiplying with
LATENCY_MULTIPLIER) to solve this problem, but will that be worth it ?

This patch tries a simple approach and caps the maximum value of default
transition delay to 10 ms. Of course, userspace can still come in and
change this value anytime or individual drivers can rather provide
transition_delay_us instead.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-08-22 15:50:03 +02:00
..
acpi-cpufreq.c cpufreq: Remove CPU hotplug callbacks only if they were initialized 2016-12-21 02:52:52 +01:00
amd_freq_sensitivity.c cpufreq: Reuse new freq-table helpers 2016-07-07 00:14:27 +02:00
arm_big_little_dt.c cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00
arm_big_little.c cpufreq: arm_big_little: Make ->get_transition_latency() mandatory 2017-07-26 00:15:44 +02:00
arm_big_little.h cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00
at32ap-cpufreq.c cpufreq: at32ap: don't declare local variable as static 2014-04-07 14:31:33 +02:00
blackfin-cpufreq.c blackfin-cpufreq: Mark cpu_set_cclk() as static 2015-12-28 01:51:36 +01:00
bmips-cpufreq.c cpufreq: bmips-cpufreq: CPUfreq driver for Broadcom's BMIPS SoCs 2017-02-09 01:22:44 +01:00
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs-cpufreq: remove unnecessary platform_set_drvdata() 2017-02-09 01:22:46 +01:00
cppc_cpufreq.c cpufreq: remove setting of policy->cpu in policy->cpus during init 2017-08-18 01:41:37 +02:00
cpufreq_conservative.c cpufreq: governor: Drop min_sampling_rate 2017-07-22 02:25:20 +02:00
cpufreq_governor_attr_set.c cpufreq: governor: Move abstract gov_attr_set code to seperate file 2016-04-02 01:09:01 +02:00
cpufreq_governor.c cpufreq: Use transition_delay_us for legacy governors as well 2017-07-22 02:25:20 +02:00
cpufreq_governor.h cpufreq: Replace "max_transition_latency" with "dynamic_switching" 2017-07-26 00:15:45 +02:00
cpufreq_ondemand.c cpufreq: governor: Drop min_sampling_rate 2017-07-22 02:25:20 +02:00
cpufreq_ondemand.h cpufreq: ondemand: Don't keep a copy of freq_table pointer 2016-06-09 00:58:06 +02:00
cpufreq_performance.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq_powersave.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq_stats.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2017-07-14 13:12:32 -07:00
cpufreq_userspace.c cpufreq: governor: Get rid of governor events 2016-06-02 23:24:15 +02:00
cpufreq-dt-platdev.c cpufreq: enable the DT cpufreq driver on the Ux500 2017-08-18 01:46:40 +02:00
cpufreq-dt.c thermal: cpu_cooling: use cpufreq_policy to register cooling device 2017-05-27 17:32:24 -07:00
cpufreq-dt.h cpufreq: dt: Support governor tunables per policy 2016-09-13 02:39:12 +02:00
cpufreq-nforce2.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
cpufreq.c cpufreq: Cap the default transition delay value to 10 ms 2017-08-22 15:50:03 +02:00
cris-artpec3-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
cris-etraxfs-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
davinci-cpufreq.c ARM: davinci: da850: fix da850_set_pll0rate() 2017-01-02 15:02:51 +05:30
e_powersaver.c cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module 2016-04-27 22:42:34 +02:00
elanfreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
exynos5440-cpufreq.c cpufreq: exynos5440: Fix inconsistent indenting 2017-06-24 01:38:00 +02:00
freq_table.c cpufreq: Handle sorted frequency tables more efficiently 2016-07-07 00:13:20 +02:00
gx-suspmod.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
highbank-cpufreq.c Merge branch 'mailbox-for-linus' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2014-10-21 11:21:19 -07:00
ia64-acpi-cpufreq.c cpufreq/ia64: Replace racy task affinity logic 2017-04-15 12:20:55 +02:00
imx6q-cpufreq.c cpufreq: imx6q: imx6ull should use the same flow as imx6ul 2017-06-24 01:35:13 +02:00
intel_pstate.c cpufreq: remove setting of policy->cpu in policy->cpus during init 2017-08-18 01:41:37 +02:00
Kconfig cpufreq: qoriq: add ARM64 SoCs support 2017-02-09 14:33:01 +01:00
Kconfig.arm cpufreq: dbx500: Delete obsolete driver 2017-08-22 15:50:02 +02:00
Kconfig.powerpc cpufreq: qoriq: rename the driver 2015-03-18 22:35:16 +01:00
Kconfig.x86 sched/x86: Change CONFIG_SCHED_ITMT to CONFIG_SCHED_MC_PRIO 2016-11-30 08:27:08 +01:00
kirkwood-cpufreq.c cpufreq: kirkwood-cpufreq:- Handle return value of clk_prepare_enable() 2017-05-30 00:09:41 +02:00
longhaul.c Power management material for v4.7-rc1 2016-05-16 19:17:22 -07:00
longhaul.h
longrun.c cpufreq: Don't set transition_latency for setpolicy drivers 2017-07-26 00:15:43 +02:00
loongson1-cpufreq.c CPUFREQ: Loongson1: Replace goto out with return in ls1x_cpufreq_probe() 2016-05-13 14:02:08 +02:00
loongson2_cpufreq.c cpufreq: Loongson2: constify platform_device_id 2017-08-18 01:44:21 +02:00
Makefile cpufreq: dbx500: Delete obsolete driver 2017-08-22 15:50:02 +02:00
maple-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
mediatek-cpufreq.c cpufreq: mediatek: add support of cpufreq to MT7622 SoC 2017-08-10 01:29:53 +02:00
mvebu-cpufreq.c cpufreq: mvebu: fix integer to pointer cast 2016-06-13 23:49:43 +02:00
omap-cpufreq.c PM / OPP: Update OPP users to put reference 2017-01-30 09:22:21 +01:00
p4-clockmod.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
pasemi-cpufreq.c cpufreq/pasemi: Adjust system_state check 2017-05-23 10:01:36 +02:00
pcc-cpufreq.c Revert "cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency" 2016-07-22 23:51:06 +02:00
pmac32-cpufreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
pmac64-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k6.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k7.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
powernow-k7.h
powernow-k8.c format-security: move static strings to const 2017-05-08 17:15:14 -07:00
powernow-k8.h cpufreq: powernow-k8: Suppress checkpatch warnings 2014-05-17 01:27:01 +02:00
powernv-cpufreq.c cpufreq: powernv: Add boost files to export ultra-turbo frequencies 2017-02-03 23:59:41 +01:00
ppc_cbe_cpufreq_pervasive.c
ppc_cbe_cpufreq_pmi.c cpufreq: Remove CPUFREQ_START notifier event 2017-02-04 00:05:30 +01:00
ppc_cbe_cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
ppc_cbe_cpufreq.h cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module 2016-04-27 22:42:34 +02:00
pxa2xx-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
pxa3xx-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
qoriq-cpufreq.c thermal: cpu_cooling: use cpufreq_policy to register cooling device 2017-05-27 17:32:24 -07:00
s3c24xx-cpufreq-debugfs.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s3c24xx-cpufreq.c cpufreq: Return index from cpufreq_frequency_table_target() 2016-06-09 00:58:06 +02:00
s3c64xx-cpufreq.c cpufreq: s3c64xx: remove incorrect __init annotation 2016-12-21 02:54:18 +01:00
s3c2410-cpufreq.c cpufreq: s3c24xx: Remove some dead code 2014-07-19 04:24:59 +09:00
s3c2412-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s3c2416-cpufreq.c cpufreq: s3c2416: double free on driver init error path 2017-02-09 01:22:45 +01:00
s3c2440-cpufreq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
s5pv210-cpufreq.c cpufreq: s5pv210: add missing of_node_put() 2017-07-26 22:54:01 +02:00
sa1100-cpufreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
sa1110-cpufreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
sc520_freq.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
scpi-cpufreq.c cpufreq: scpi: use new scpi_ops functions to remove duplicate code 2017-06-05 11:14:35 +01:00
sfi-cpufreq.c cpufreq: sfi: make freq_table static 2017-06-24 01:43:21 +02:00
sh-cpufreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
sparc-us2e-cpufreq.c cpufreq/sparc-us2e: Replace racy task affinity logic 2017-04-15 12:20:56 +02:00
sparc-us3-cpufreq.c cpufreq/sparc-us3: Replace racy task affinity logic 2017-04-15 12:20:55 +02:00
spear-cpufreq.c cpufreq: drop owner assignment from platform_drivers 2014-10-20 16:20:24 +02:00
speedstep-centrino.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
speedstep-ich.c cpufreq: speedstep: remove unnecessary static in speedstep_detect_chipset() 2017-07-16 02:12:35 +02:00
speedstep-lib.c cpufreq: Use consistent prefixing via pr_fmt 2016-04-09 01:35:18 +02:00
speedstep-lib.h
speedstep-smi.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
sti-cpufreq.c scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
tango-cpufreq.c cpufreq: dt: Don't use generic platdev driver for tango 2017-07-22 02:20:59 +02:00
tegra20-cpufreq.c cpufreq: tegra20: remove superfluous CONFIG_PM ifdefs 2015-09-26 03:00:57 +02:00
tegra124-cpufreq.c cpufreq: tegra124: No need of setting platform-data 2016-04-09 01:12:09 +02:00
tegra186-cpufreq.c cpufreq: Add Tegra186 cpufreq driver 2017-04-19 23:23:08 +02:00
ti-cpufreq.c cpufreq: make ti-cpufreq explicitly non-modular 2017-02-16 00:58:52 +01:00
unicore2-cpufreq.c cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag 2017-07-26 00:15:46 +02:00
vexpress-spc-cpufreq.c cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table 2016-05-05 01:40:04 +02:00