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Rafał Bilski 826e570bb2 [CPUFREQ] e_powersaver: Allow user to lower maximum voltage 
Add new module option "set_max_voltage".
One of the lessons learned from Adaptive Powersaver is that voltage values
returned by processor are for worst case scenario. But required voltage
is changing with CPU temperature. And even processors produced in the same
batch can have different minimum voltage necessary for stable work at
specified frequency.
On Elonex Webbook, once system starts, temperature never drops below
48 deg. C. Loading module after systems start allows user to lower CPU
voltage and still have stable system.
Sadly C7 doesn't allow code to set frequency or voltage from outside limits.
If you ask it to set voltage lower then minimum it will ignore you. Thats
why it isn't possible to change minimum voltage for minimum frequency too.
Changing maximum voltage on Elonex Webbook leads to very good results. Looks
like VIA C7 1.6GHz 1084mV can safetly run at 892mV. This means 83% of
orginal value. If same percentage applies to power generated it means 12.5W
in the place of 15W. Not much, but it is better then nothing.
Only C7-M makes it possible.
If voltage is too low by 16mV or more you will experience kernel panic.
If voltage is too low by 32mV or more you will experience system freeze.

Signed-off-by: Rafał Bilski <rafalbilski@interia.pl>
Signed-off-by: Dave Jones <davej@redhat.com>
 		2011-10-26 17:19:46 -04:00
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accessibility
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acpi Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 17:08:43 +02:00
amba
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ata
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atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2011-10-25 13:25:22 +02:00
auxdisplay
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base Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2011-10-25 15:18:39 +02:00
bcma Merge branch 'master' of github.com:davem330/net 2011-09-22 03:23:13 -04:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
bluetooth Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2011-10-25 15:18:39 +02:00
cdrom
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char Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 17:03:38 +02:00
clk
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clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 17:15:03 +02:00
connector connector: add comm change event report to proc connector 2011-09-28 13:41:50 -04:00
cpufreq [CPUFREQ] e_powersaver: Allow user to lower maximum voltage 2011-10-26 17:19:46 -04:00
cpuidle
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crypto
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dca
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devfreq PM / devfreq: Add basic governors 2011-10-02 00:19:34 +02:00
dio
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dma
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edac
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eisa
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firewire firewire: ohci: add no MSI quirk for O2Micro controller 2011-09-16 22:22:10 +02:00
firmware
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gpio gpio-pca953x: fix gpio_base 2011-10-13 13:49:37 -06:00
gpu Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
hid Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2011-10-25 15:18:39 +02:00
hv hv: remove struct hv_device_info from hyperv.h 2011-10-11 09:51:22 -06:00
hwmon hwmon: (w83627ehf) Better fix for negative temperature values 2011-10-24 11:09:48 -07:00
hwspinlock
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i2c
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ide Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
idle
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ieee802154
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infiniband net: add skb frag size accessors 2011-10-19 03:10:46 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
iommu Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 16:17:32 +02:00
isdn Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2011-10-26 15:11:09 +02:00
leds doc: fix broken references 2011-09-27 18:08:04 +02:00
lguest
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macintosh
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mca
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md Merge branch 'for-linus' of git://neil.brown.name/md 2011-10-26 21:39:42 +02:00
media Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2011-10-25 15:18:39 +02:00
memstick
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message
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mfd Merge branch 'for-linus' of git://opensource.wolfsonmicro.com/regmap 2011-10-25 13:57:45 +02:00
misc Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core 2011-10-25 12:13:59 +02:00
mmc Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2011-09-21 13:20:21 -07:00
mtd doc: fix broken references 2011-09-27 18:08:04 +02:00
net net: make bonding slaves honour master's skb->priority 2011-10-25 19:22:23 -04:00
nfc nfc: NFC_WILINK depends on NFC_NCI 2011-09-21 16:19:44 -04:00
nubus
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of
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oprofile
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parisc doc: fix broken references 2011-09-27 18:08:04 +02:00
parport parport_pc: release IO region properly if unsupported ITE887x card is found 2011-10-18 14:17:40 -07:00
pci Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 16:11:53 +02:00
pcmcia ARM: 7024/1: simpad: Cleanup CS3 accessors. 2011-10-17 09:12:42 +01:00
pinctrl pinctrl/sirf: fix sirfsoc_get_group_pins prototype 2011-10-25 10:43:57 +02:00
platform thinkpad_acpi: Fix printk typo 'bluestooth' 2011-10-07 09:39:51 +02:00
pnp
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power
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pps
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ps3
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ptp
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rapidio
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regulator
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rtc
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s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2011-10-25 13:25:22 +02:00
sbus
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scsi Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd 2011-10-26 21:33:50 +02:00
sfi
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sh
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sn
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spi spi-topcliff-pch: Fix overrun issue 2011-10-04 10:10:50 -06:00
ssb
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staging Remove stale "depends on NETDEV_1000"in staging drivers 2011-10-26 17:21:19 +02:00
target Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-10-25 12:11:02 +02:00
tc
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telephony
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thermal
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tty Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty 2011-10-26 15:11:09 +02:00
uio uio: Support physical addresses >32 bits on 32-bit systems 2011-10-18 11:18:57 -07:00
usb Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2011-10-25 15:18:39 +02:00
uwb
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vhost
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video Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 16:17:32 +02:00
virt
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virtio Add ethtool -g support to virtio_net 2011-10-24 02:07:21 -04:00
vlynq
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w1
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watchdog Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 17:03:38 +02:00
xen Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-26 16:44:09 +02:00
zorro zorro: Fix four checkpatch warnings 2011-10-24 21:00:34 +02:00
Kconfig Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2011-10-26 15:39:02 +02:00
Makefile Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2011-10-26 15:39:02 +02:00