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c324f43aed
linux/drivers
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Marek Szyprowski c324f43aed cpuidle: exynos: Unify target residency for AFTR and coupled AFTR states 
Since commit 45f1ff59e2 ("cpuidle: Return nohz hint from
cpuidle_select()") Exynos CPUidle driver stopped entering C1 (AFTR) mode
on Exynos4412-based Trats2 board.

Further analysis revealed that the CPUidle framework changed the way
it handles predicted timer ticks and reported target residency for the
given idle states. As a result, the C1 (AFTR) state was not chosen
anymore on completely idle device. The main issue was to high target
residency value. The similar C1 (AFTR) state for 'coupled' CPUidle
version used 10 times lower value for the target residency, despite
the fact that it is the same state from the hardware perspective.

The 100000us value for standard C1 (AFTR) mode is there from the begining
of the support for this idle state, added by the commit 67173ca492
("ARM: EXYNOS: Add support AFTR mode on EXYNOS4210"). That commit doesn't
give any reason for it, instead it looks like it was blindly copied from
the WFI/IDLE state of the same driver that time. That time, that value
was probably not really used by the framework for any critical decision,
so it didn't matter that much.

Now it turned out to be an issue, so unify the target residency with the
'coupled' version, as it seems to better match the real use case values
and restores the operation of the Exynos CPUidle driver on the idle
device.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-04-01 23:49:51 +02:00
..
accessibility
acpi ACPI fix for 5.1-rc3 2019-03-30 10:09:11 -07:00
amba ARM: 8836/1: drivers: amba: Update component matching to use the CoreSight UCI values. 2019-02-26 11:23:49 +00:00
android binder: fix race between munmap() and direct reclaim 2019-03-21 06:51:32 +01:00
ata libata: fix using DMA buffers on stack 2019-03-28 08:16:04 -06:00
atm
auxdisplay auxdisplay: charlcd: make backlight initial state configurable 2019-03-17 08:48:45 +01:00
base Device properties framework fix for 5.1-rc2 2019-03-22 12:08:52 -07:00
bcma
block drivers/block/zram/zram_drv.c: fix idle/writeback string compare 2019-03-29 10:01:37 -07:00
bluetooth Bluetooth: mediatek: add support for MediaTek MT7663U and MT7668U UART devices 2019-03-02 19:51:23 +01:00
bus ARM: SoC driver updates for 5.1 2019-03-06 09:41:12 -08:00
cdrom
char Merge branch 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-03-10 17:37:29 -07:00
clk We have a fairly balanced mix of clk driver updates and clk framework 2019-03-14 08:46:17 -07:00
clocksource clocksource/drivers/clps711x: Remove board support 2019-03-24 11:30:11 +01:00
connector connector: fix unsafe usage of ->real_parent 2019-03-08 15:06:38 -08:00
cpufreq cpufreq: scpi: Fix use after free 2019-03-28 11:14:31 +01:00
cpuidle cpuidle: exynos: Unify target residency for AFTR and coupled AFTR states 2019-04-01 23:49:51 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-03-13 09:51:17 -07:00
dax device-dax for 5.1 2019-03-16 13:05:32 -07:00
dca
devfreq
dio
dma dmaengine: stm32-mdma: Revert "dmaengine: stm32-mdma: Add a check on read_u32_array" 2019-03-25 21:56:54 +05:30
dma-buf
edac Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-08 09:11:39 -08:00
eisa
extcon
firewire
firmware memblock: drop memblock_alloc_*_nopanic() variants 2019-03-12 10:04:02 -07:00
fmc
fpga
fsi
gnss
gpio gpio fixes for v5.1-rc3 2019-03-29 03:04:47 +01:00
gpu drm/i915 fixes for v5.2-rc3: 2019-03-29 10:45:11 +10:00
hid Merge branch 'for-5.1/wacom' into for-linus 2019-03-05 15:43:05 +01:00
hsi
hv Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
hwmon hwmon: (ad7418) Add device tree probing 2019-02-25 09:06:00 -08:00
hwspinlock
hwtracing ARM updates for 5.1-rc1 2019-03-15 14:37:46 -07:00
i2c i2c: i801: Add support for Intel Comet Lake 2019-03-20 17:42:23 +01:00
i3c - Add a /* fall-through */ comment in the dw-i3c-master driver 2019-03-04 19:05:02 -08:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2019-03-11 09:34:00 -07:00
idle
iio - New Drivers 2019-03-08 10:02:58 -08:00
infiniband i40iw: Avoid panic when handling the inetdev event 2019-03-17 21:40:40 -03:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2019-03-11 10:57:11 -07:00
interconnect
iommu Merge branch 'akpm' (patches from Andrew) 2019-03-29 16:02:28 -07:00
ipack
irqchip irqchip/irq-mvebu-sei: Make mvebu_sei_ap806_caps static 2019-03-21 16:43:00 +01:00
isdn mISDN: hfcpci: Test both vendor & device ID for Digium HFC4S 2019-03-18 18:32:44 -07:00
leds leds: trigger: netdev: use memcpy in device_name_store 2019-03-30 19:09:32 +01:00
lightnvm pblk: fix max_io calculation 2019-03-07 08:59:26 -07:00
macintosh treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
mailbox mailbox: imx: keep MU irq working during suspend/resume 2019-03-11 02:51:43 -05:00
mcb
md for-5.1/block-post-20190315 2019-03-16 12:36:39 -07:00
media DMA mapping updates for 5.1 2019-03-10 11:54:48 -07:00
memory
memstick
message
mfd DMA mapping updates for 5.1 2019-03-10 11:54:48 -07:00
misc 5.1 Merge Window Pull Request 2019-03-09 15:53:03 -08:00
mmc mmc: renesas_sdhi: limit block count to 16 bit for old revisions 2019-03-21 11:41:46 +01:00
mtd This pull request contains updates for both UBI and UBIFS: 2019-03-13 09:34:35 -07:00
mux
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-03-27 12:22:57 -07:00
nfc
ntb Fixes for switchtec debugability and mapping table entries, NTB 2019-03-15 14:32:59 -07:00
nubus
nvdimm device-dax for 5.1 2019-03-16 13:05:32 -07:00
nvme nvmet: fix error flow during ns enable 2019-03-28 18:15:03 +01:00
nvmem Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
of of: fix kmemleak crash caused by imbalance in early memory reservation 2019-03-12 10:04:02 -07:00
opp PM / OPP: Update performance state when freq == old_freq 2019-03-12 09:45:56 +01:00
oprofile
parisc DMA mapping updates for 5.1 2019-03-10 11:54:48 -07:00
parport Revert "parport: daisy: use new parport device model" 2019-03-25 14:49:00 -07:00
pci PCI/LINK: Deduplicate bandwidth reports for multi-function devices 2019-03-25 17:59:07 -05:00
pcmcia
perf arm64 updates for 5.1: 2019-03-10 10:17:23 -07:00
phy phy: sun4i-usb: Support set_mode to USB_HOST for non-OTG PHYs 2019-03-26 16:48:55 +09:00
pinctrl This is the bulk of pin control changes for the v5.1 kernel cycle. 2019-03-11 11:12:50 -07:00
platform Chrome Platform fixes for v5.1-rc2 2019-03-19 11:28:15 -07:00
pnp ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
power power: reset: at91-reset: add support for sam9x60 SoC 2019-02-20 00:41:01 +01:00
powercap
pps
ps3
ptp Merge branch 'timers-2038-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-05 14:08:26 -08:00
pwm pwm: atmel: Remove useless symbolic definitions 2019-03-04 12:52:49 +01:00
rapidio rapidio/mport_cdev: mark expected switch fall-through 2019-03-07 18:32:02 -08:00
ras
regulator regulator: mc13xxx: Constify regulator_ops variables 2019-03-04 00:01:08 +00:00
remoteproc remoteproc updates for v5.1 2019-03-14 09:00:06 -07:00
reset
rpmsg rpmsg: virtio: change header file sort style 2019-02-20 21:15:54 -08:00
rtc chrome platform changes for v5.1 2019-03-12 09:46:32 -07:00
s390 SCSI fixes on 20190329 2019-03-29 14:58:49 -07:00
sbus
scsi scsi: ibmvfc: Clean up transport events 2019-03-27 21:34:20 -04:00
sfi
sh
siox
slimbus
sn
soc This pull request brings in a build fix for arm64 with bcm2835 2019-03-18 10:31:24 -07:00
soundwire
spi pci-v5.1-changes 2019-03-09 14:57:08 -08:00
spmi
ssb
staging staging: vt6655: Remove vif check from vnt_interrupt 2019-03-29 17:25:45 +01:00
target SCSI misc on 20190315 2019-03-16 12:51:50 -07:00
tc
tee ARM: SoC driver updates for 5.1 2019-03-06 09:41:12 -08:00
thermal Merge branches 'fixes' and 'thermal-intel' into next 2019-03-18 22:37:44 +08:00
thunderbolt
tty tty: fix NULL pointer issue when tty_port ops is not set 2019-03-28 01:21:21 +09:00
uio
usb USB-serial fixes for 5.1-rc3 2019-03-29 15:31:16 +01:00
uwb
vfio powerpc updates for 5.1 2019-03-07 12:56:26 -08:00
vhost virtio: fixes, cleanups 2019-03-10 12:47:57 -07:00
video fbdev changes for v5.1: 2019-03-15 14:22:59 -07:00
virt virt: vbox: Implement passing requestor info to the host for VirtualBox 6.0.x 2019-03-28 01:55:18 +09:00
virtio virtio: hint if callbacks surprisingly might sleep 2019-03-06 11:19:57 -05:00
visorbus
vlynq
vme
w1
watchdog linux-watchdog 5.1-rc1 tag 2019-03-11 11:22:15 -07:00
xen xen/balloon: Fix mapping PG_offline pages to user space 2019-03-15 15:35:35 +01:00
zorro
Kconfig
Makefile IOMMU Updates for Linux v5.1 2019-03-10 12:29:52 -07:00