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* ACPI: video: Add dev argument for backlight_device_registerYu Luming2006-12-20
| | | | | | | | | | | | | | | | | | | | | This patch set adds generic abstract layer support for acpi video driver to have generic user interface to control backlight and output switch control by leveraging the existing backlight sysfs class driver, and by adding a new video output sysfs class driver. This patch: Add dev argument for backlight_device_register to link the class device to real device object. The platform specific driver should find a way to get the real device object for their video device. [akpm@osdl.org: build fix] [akpm@osdl.org: fix msi-laptop.c] Signed-off-by: Luming Yu <Luming.yu@intel.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* ACPI: Implement acpi_video_get_next_level()Thomas Tuttle2006-12-20
| | | | | | | | | | | | | | | | | acpi_video_get_next_level was supposed to implement an algorithm to select a new brightness level based on the old brightness level of an ACPI video device, but it simply says "/* Fix me */" and returns the current brightness. This patch implements acpi_video_get_next_level properly. It had to change a few constants at the top of the file because they were (apparently) wrong, but it appears to work on my Dell Inspiron e1405 (with BIOS A05 only--BIOS A04 doesn't seem to send ACPI video hotkey events). [akpm@osdl.org: cleanups] Signed-off-by: Thomas Tuttle <linux-kernel@ttuttle.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* ACPI: ibm_acpi: allow clean removalAlexey Starikovskiy2006-12-19
| | | | | | | | Allow clean removal by setting notify_installed in the right place. Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Len Brown <len.brown@intel.com>
* ACPI: ibm-acpi: update version and copyrightHenrique de Moraes Holschuh2006-12-07
| | | | | | Bump up module version, add myself to copyright and MODULE_AUTHOR. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: style fixes and cruft removalHenrique de Moraes Holschuh2006-12-07
| | | | | | | This patch just fixes style, move some #defines to enums, and removes some old cruft. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: backlight device cleanupHenrique de Moraes Holschuh2006-12-07
| | | | | | | | This patch cleans up the recently added backlight device support by Holger Macht <hmacht@suse.de> to fit well with the rest of the code, using the ibms struct as the other "subdrivers" in ibm-acpi. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: make non-generic bay support optionalHenrique de Moraes Holschuh2006-12-07
| | | | | | | This patch makes it possible to disable ibm-acpi non-generic bay support, as generic bay support already works well for a number of ThinkPads. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: add support for the ultrabay on the T60,X60Henrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | This patch adds support for the ultrabay on the T60, X60 and other new ThinkPads that have a SATA ultrabay. I intend to keep bay and dock support in ibm-acpi working and updated until it finally gets deprecated and removed in favour of the generic dock and bay support. But we aren't there yet. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: implement fan watchdog commandHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | | | | | | | | | | This patch implements a fan control safety watchdog, by request of the authors of userspace fan control scripts. When the watchdog timer expires, the equivalent action of a "fan enable" command is executed. The watchdog timer is reset at every reception of a fan control command that could change the state of the fan itself. This command is meant to be used by userspace fan control daemons, to make sure the fan is never left set to an unsafe level because of userspace problems. Users of the X31/X40/X41 "speed" command are on their own, the current implementation of "speed" is just too incomplete to be used safely, anyway. Better to never use it, and just use the "level" command instead. The watchdog is programmed using echo "watchdog <number>" > fan, where number is the number of seconds to wait before doing an "enable", and zero disables the watchdog. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: workaround for EC 0x2f initialization bugHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A few ThinkPads fail to initialize EC register 0x2f both in the EC firmware and ACPI DSDT. If the BIOS and the ACPI DSDT also do not initialize it, then the initial status of that register does not correspond to reality. On all reported buggy machines, EC 0x2f will read 0x07 (fan level 7) upon cold boot, when the EC is actually in mode 0x80 (auto mode). Since returning a text string ("unknown") would break a number of userspace programs, instead we correct the reading for the most probably correct answer, and return it is in auto mode. The workaround flags the status and level as unknown on module load/kernel boot, until we are certain at least one fan control command was issued, either by us, or by something else. We don't work around the bug by doing a "fan enable" at module load/startup (which would initialize the EC register) because it is not known if these ThinkPad ACPI DSDT might have set the fan to level 7 instead of "auto" (we don't know if they can do this or not) due to a thermal condition, and we don't want to override that, should they be capable of it. We should be setting the workaround flag to "status known" upon resume, as both reports and a exaustive search on the DSDT tables at acpi.sf.net show that the DSDTs always enable the fan on resume, thus working around the bug. But since we don't have suspend/resume handlers in ibm-acpi yet and the "EC register 0x2f was modified" logic is likely to catch the change anyway, we don't. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: store embedded controller firmware version for matchingHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | This patch changes the ThinkPad Embedded Controller DMI matching code to store the firmware version of the EC for later usage, e.g. for quirks. It also prints the firmware version when starting up. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: fix and extend fan control functionsHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | | | | | | This patch extend fan control functions, implementing enable/disable for all write access modes, implementing level control for all level-capable write access modes. The patch also updates the documentation, explaining levels auto and disengaged. ABI changes: 1. Support level 0 as an equivalent to disable 2. Add support for level auto and level disengaged when doing EC 0x2f fan control 3. Support enable/disable for all level-based write access modes 4. Add support for level command on FANS thinkpads, as per thinkwiki reports Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: fix and extend fan enableHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | This patch fix fan enable to attempt to do the right thing and not slow down the fan if it is forced to the maximum speed. It also extends fan enable to work on older thinkpads. ABI changes: 1. Support enable/disable for all level-based write access modes Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: extend fan status functionsHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | | | This patch fixes fan_read to return correct values for all fan access modes. It also implements some fan access mode status output that was missing, and normalizes the proc fan abi to return consistent data across all fan read/write modes. Userspace ABI changes and extensions: 1. Return status: enable/disable for *all* modes (this actually improves compatibility with userspace utils!) 2. Return level: auto and level: disengaged for EC 2f access mode 3. Return level: <number> for EC 0x2f access mode 4. Return level 0 as well as "disabled" in level-aware modes Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: document fan controlHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | This patch documents the ThinkPad fan control strategies. Source of the data: 0. ibm-acpi source 1. DSDTs for various ThinkPads (770, X31, X40, X41, T43, A21m, T22) 2. http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues 3. http://thinkwiki.org/wiki/How_to_control_fan_speed 4. Various threads about windows fan control utilities in thinkpads.com Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: cleanup fan_writeHenrique de Moraes Holschuh2006-12-07
| | | | | | | This patch cleans up fan_write so that it is much easier to read and extend. It separates the proc api handling from the operations themselves. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: break fan_read into separate functionsHenrique de Moraes Holschuh2006-12-07
| | | | | | | This patch breaks fan_read mechanics into a generic function to get fan status and speed, and leaves only the procfs interface code in fan_read. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: clean up fan_readHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | This patch cleans up fan_read so that it is much easier to read and extend. The patch fixes the userspace ABI to return "status: not supported" (like all other ibm-acpi functions) when neither fan status or fan control are possible. It also fixes the userspace ABI to return EIO if ACPI access to the EC fails, instead of returning "status: unreadable" or "speed: unreadable". Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: prepare to cleanup fan_read and fan_writeHenrique de Moraes Holschuh2006-12-07
| | | | | | | | This patch lays some groundwork for a fan_read and fan_write cleanup in the next patches. To do so, it provides a new fan_init initializer, and also some constants (through enums). Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: Implement direct-ec-access thermal reading modes for up to ↵Henrique de Moraes Holschuh2006-12-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 16 sensors This patch extends ibm-acpi to support reading thermal sensors directly through ACPI EC register access. It uses a DMI match to detect ThinkPads with a new-style embedded controller, that are known to have forward- compatible register maps and use 0x00 to fill in non-used registers and export thermal sensors at EC offsets 0x78-7F and 0xC0-C7. Direct ACPI EC register access is implemented for 8-sensor and 16-sensor new-style ThinkPad controller firmwares as an experimental feature. The code does some limited sanity checks on the temperatures read through EC access, and will default to the old ACPI TMP0-7 mode if anything is amiss. Userspace ABI is not changed for 8 sensors, but /proc/acpi/ibm/thermal is extended for 16 sensors if the firmware supports 16 sensors. A documentation update is also provided. The information about the ThinkPad register map was determined by studying ibm-acpi "ecdump" output from various ThinkPad models, submitted by subscribers of the linux-thinkpad mailinglist. Futher information was gathered from the DSDT tables, as they describe the EC register map in recent ThinkPads. DSDT source shows that TMP0-7 access and direct register access are actually the same thing on these firmwares, but unfortunately IBM never did update their DSDT EC register map to export TMP8-TMP15 for the second range of sensors. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: Use a enum to select the thermal sensor reading strategyHenrique de Moraes Holschuh2006-12-07
| | | | | | | | | This patch consolidades all decisions regarding the strategy to be used to read thinkpad thermal sensors into a single enum, and refactors the thermal sensor reading code to use a much more readable (and easier to extend) switch() construct, in a separate function. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: trivial Lindent cleanupsHenrique de Moraes Holschuh2006-12-07
| | | | | | | This patch just makes drives/acpi/ibm-acpi.c Lindent-clean, as requested by Len Brown. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: ibm-acpi: do not use / in driver namesHenrique de Moraes Holschuh2006-12-07
| | | | | | | | ibm-acpi uses sub-device names like ibm/hotkey, which get in the way of a sysfs conversion. Fix it to use ibm_hotkey instead. Thanks to Zhang Rui for noticing this. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
* ACPI: toshiba_acpi: Add support for the generic backlight deviceHolger Macht2006-10-21
| | | | | | | | | | | | | | | Add support for the generic backlight interface below /sys/class/backlight. Keep the procfs brightness handling for backward compatibility. To achive this, add two generic functions get_lcd and set_lcd to be used both by the procfs related and the sysfs related methods. [apw@shadowen.org: backlight users need to select BACKLIGHT_CLASS_DEVICE] Signed-off-by: Holger Macht <hmacht@suse.de> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* ACPI: asus_acpi: Add support for the generic backlight deviceHolger Macht2006-10-21
| | | | | | | | | | | | Add support for the generic backlight interface below /sys/class/backlight. Keep the procfs brightness handling for backward compatibility. [apw@shadowen.org: backlight users need to select BACKLIGHT_CLASS_DEVICE] Signed-off-by: Holger Macht <hmacht@suse.de> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* ACPI: ibm_acpi: Add support for the generic backlight deviceHolger Macht2006-10-21
| | | | | | | | | | | | | | | Add support for the generic backlight interface below /sys/class/backlight. The patch keeps the procfs brightness handling for backward compatibility. Add two generic functions brightness_get and brightness_set to be used both by the procfs related and the sysfs related methods. [apw@shadowen.org: backlight users need to select BACKLIGHT_CLASS_DEVICE] Signed-off-by: Holger Macht <hmacht@suse.de> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* [PATCH] acpi memory hotplug: remove strange add_memory fail messageYasunori Goto2006-10-20
| | | | | | | | | | | | | | | | | | | I wrote a patch to avoid redundant memory hot-add call at boot time. This was cause of strange fail message of memory hotplug like "ACPI: add_memory failed". Memory is recognized by early boot code with EFI/E820. But, if DSDT describes memory devices for them, then hot-add code is called for already recognized memory, and it shows fail messages with -EEXIST. So, sys admin will misunderstand this message as something wrong by it. This patch avoids them by preventing redundant hot-add call until completion of driver initialization. [akpm@osdl.org: cleanups] Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: "Brown, Len" <len.brown@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Change log level of a message of acpi_memhotplug to KERN_DEBUGYasunori Goto2006-10-20
| | | | | | | | | | I suppose this message seems quite useless except debugging. It just shows "Hotplug Mem Device". System admin can't know anything by this message. So, I would like to change it to KERN_DEBUG. Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] fix "ACPI: Processor native C-states using MWAIT"Darrick J. Wong2006-10-20
| | | | | | | | | | | | | | | | This patch breaks C-state discovery on my IBM IntelliStation Z30 because the return value of acpi_processor_get_power_info_fadt is not assigned to "result" in the case that acpi_processor_get_power_info_cst returns -ENODEV. Thus, if ACPI provides C-state data via the FADT and not _CST (as is the case on this machine), we incorrectly exit the function with -ENODEV after reading the FADT. The attached patch sets the value of result so that we don't exit early. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Acked-by: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com> Acked-by: "Brown, Len" <len.brown@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] acpi_processor_latency_notifier(): UP warning fixAndrew Morton2006-10-17
| | | | | | | | | drivers/acpi/processor_idle.c:1112: warning: 'smp_callback' defined but not used Cc: Len Brown <lenb@kernel.org> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Pull trivial into test branchLen Brown2006-10-14
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| * ACPI: fix printk format warningsRandy Dunlap2006-10-14
| | | | | | | | | | | | | | | | | | | | Fix printk format warnings in drivers/acpi: drivers/acpi/tables/tbget.c:326: warning: format '%X' expects type 'unsigned int', but argument 5 has type 'long unsigned int' drivers/acpi/tables/tbrsdt.c:189: warning: format '%X' expects type 'unsigned int', but argument 5 has type 'long unsigned int' Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
| * ACPI: fix section for CPU init functionsPierre Ossman2006-10-14
| | | | | | | | | | | | | | | | | | The ACPI processor init functions should be marked as __cpuinit as they use structures marked with __cpuinitdata. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
| * ACPI: update comments in motherboard.cLen Brown2006-10-14
| | | | | | | | Signed-off-by: Len Brown <len.brown@intel.com>
| * ACPI: acpi_pci_link_set() can allocate with either GFP_ATOMIC or GFP_KERNELJiri Kosina2006-10-14
| | | | | | | | | | | | | | | | | | acpi_pci_link_set() allocates both with interrupts on and with interrupts off (resume-time), so check interrupts and decide on GFP_ATOMIC or GFP_KERNEL at run-time. Signed-off-by: Jiri Kosina <jikos@jikos.cz> Signed-off-by: Len Brown <len.brown@intel.com>
| * ACPI: fix potential OOPS in power driver with CONFIG_ACPI_DEBUGDmitry Torokhov2006-10-14
| | | | | | | | | | | | | | device was set to null and used before set in a debug printk Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Len Brown <len.brown@intel.com>
* | Pull bugzilla-5534 into test branchLen Brown2006-10-14
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| * | ACPI: created a dedicated workqueue for notify() executionAlexey Y. Starikovskiy2006-10-14
| | | | | | | | | | | | | | | | | | http://bugzilla.kernel.org/show_bug.cgi?id=5534#c160 Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: Remove deferred execution from global lock acquire wakeup pathAlexey Y. Starikovskiy2006-10-14
| |/ | | | | | | | | | | | | | | | | | | On acquiring the ACPI global lock, if there were sleepers on the lock, we used to use acpi_os_execute() to defer a thread which would signal sleepers. Now just signal the semaphore directly. http://bugzilla.kernel.org/show_bug.cgi?id=5534#c159 Signed-off-by: Len Brown <len.brown@intel.com>
* | Pull ec into test branchLen Brown2006-10-14
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| * | ACPI: EC: export ec_transaction() for msi-laptop driverLennart Poettering2006-10-14
| | | | | | | | | | | | | | | Signed-off-by: Lennart Poettering <mzxreary@0pointer.de> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: EC: Simplify acpi_hw_low_level*() with inb()/outb().Denis M. Sadykov2006-10-14
| | | | | | | | | | | | | | | | | | | | | Simplify acpi_hw_low_level_xxx() functions to inb() and outb(). Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: EC: Unify poll and interrupt gpe handlersDenis M. Sadykov2006-10-14
| | | | | | | | | | | | | | | Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: EC: Unify poll and interrupt mode transaction functionsDenis M. Sadykov2006-10-14
| | | | | | | | | | | | | | | Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: EC: Remove unused variables and duplicated codeDenis M. Sadykov2006-10-14
| | | | | | | | | | | | | | | Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: EC: Remove unnecessary delay added by previous transation patch.Denis M. Sadykov2006-10-14
| | | | | | | | | | | | | | | | | | | | | Remove unnecessary delay (50 ms) while reading data from EC in interrupt mode. Signed-off-by: Alexey Y. Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI: consolidate functions in acpi ec driverLennart Poettering2006-10-14
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Unify the following functions: acpi_ec_poll_read() acpi_ec_poll_write() acpi_ec_poll_query() acpi_ec_intr_read() acpi_ec_intr_write() acpi_ec_intr_query() into: acpi_ec_poll_transaction() acpi_ec_intr_transaction() These new functions take as arguments an ACPI EC command, a few bytes to write to the EC data register and a buffer for a few bytes to read from the EC data register. The old _read(), _write(), _query() are just special cases of these functions. Then unified the code in acpi_ec_poll_transaction() and acpi_ec_intr_transaction() a little more. Both functions are now just wrappers around the new acpi_ec_transaction_unlocked() function. The latter contains the EC access logic, the two original function now just do their special way of locking and call the the new function for the actual work. This saves a lot of very similar code. The primary reason for doing this, however, is that my driver for MSI 270 laptops needs to issue some non-standard EC commands in a safe way. Due to this I added a new exported function similar to ec_write()/ec_write() which is called ec_transaction() and is essentially just a wrapper around acpi_ec_{poll,intr}_transaction(). Signed-off-by: Lennart Poettering <mzxreary@0pointer.de> Acked-by: Luming Yu <luming.yu@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* | Pull mwait into test branchLen Brown2006-10-14
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| * | ACPI: Processor native C-states using MWAITVenkatesh Pallipadi2006-10-14
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Intel processors starting with the Core Duo support support processor native C-state using the MWAIT instruction. Refer: Intel Architecture Software Developer's Manual http://www.intel.com/design/Pentium4/manuals/253668.htm Platform firmware exports the support for Native C-state to OS using ACPI _PDC and _CST methods. Refer: Intel Processor Vendor-Specific ACPI: Interface Specification http://www.intel.com/technology/iapc/acpi/downloads/302223.htm With Processor Native C-state, we use 'MWAIT' instruction on the processor to enter different C-states (C1, C2, C3). We won't use the special IO ports to enter C-state and no SMM mode etc required to enter C-state. Overall this will mean better C-state support. One major advantage of using MWAIT for all C-states is, with this and "treat interrupt as break event" feature of MWAIT, we can now get accurate timing for the time spent in C1, C2, .. states. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
* | Pull battery into test branchLen Brown2006-10-14
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