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Bjorn Helgaas af8bb9f898 PCI/ACPI: Request LTR control from platform before using it 
Per the PCI Firmware spec r3.2, sec 4.5, an ACPI-based OS should use _OSC
to request control of Latency Tolerance Reporting (LTR) before using it.

Request control of LTR, and if the platform does not grant control, don't
use it.

N.B. If the hardware supports LTR and the ASPM L1.2 substate but the BIOS
doesn't support LTR in _OSC, we previously would enable ASPM L1.2.  This
patch will prevent us from enabling ASPM L1.2 in that case.  It does not
prevent us from enabling PCI-PM L1.2, since that doesn't depend on LTR.
See PCIe r40, sec 5.5.1, for the L1 PM substate entry conditions.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-04-23 08:18:44 -05:00
..
acpica
ACPICA: Cleanup/simplify module-level code support
2018-03-18 19:29:46 +01:00
apei
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-01-30 14:18:52 -08:00
arm64
IOMMU Updates for Linux v4.17
2018-04-11 18:50:41 -07:00
dptf
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nfit
libnvdimm for 4.17
2018-04-10 10:25:57 -07:00
pmic
ACPI / PMIC: Replace license boilerplate with SPDX license identifier
2018-02-22 23:14:58 +01:00
x86
ACPI / x86: Extend KIOX000A quirk to cover all affected BIOS versions
2017-10-21 13:24:53 +02:00
ac.c
battery: Add the battery hooking API
2018-02-21 23:27:13 +01:00
acpi_amba.c
…
acpi_apd.c
ACPI / APD: Add clock frequency for ThunderX2 I2C controller
2017-10-17 23:52:54 +02:00
acpi_cmos_rtc.c
…
acpi_configfs.c
ACPI: configfs: make config_item_type const
2017-10-19 16:15:29 +02:00
acpi_dbg.c
vfs: do bulk POLL* -> EPOLL* replacement
2018-02-11 14:34:03 -08:00
acpi_extlog.c
ACPI: Switch to use generic guid_t in acpi_evaluate_dsm()
2017-06-07 12:20:49 +02:00
acpi_ipmi.c
ACPI / IPMI: change warning to debug on timeout
2017-04-07 12:25:37 -05:00
acpi_lpat.c
ACPI / lpat: Fix typos in comments and kerneldoc style
2017-07-24 22:52:00 +02:00
acpi_lpit.c
ACPI / LPIT: Export lpit_read_residency_count_address()
2018-02-04 15:55:52 +02:00
acpi_lpss.c
ACPI / LPSS: Do not instiate platform_dev for devs without MMIO resources
2018-01-15 17:45:25 +01:00
acpi_memhotplug.c
…
acpi_pad.c
ACPI: acpi_pad: Fix memory leak in power saving threads
2018-03-30 12:04:58 +02:00
acpi_platform.c
ACPI / platform: Update platform device NUMA node based on _PXM method
2017-04-18 16:56:39 +02:00
acpi_pnp.c
…
acpi_processor.c
ACPI: Mark expected switch fall-throughs
2017-11-09 00:55:16 +01:00
acpi_tad.c
ACPI: Add Time and Alarm Device (TAD) driver
2018-03-20 10:36:04 +01:00
acpi_video.c
ACPI / video: Use true for boolean value
2018-02-04 08:55:36 +01:00
acpi_watchdog.c
ACPI / watchdog: Fix off-by-one error at resource assignment
2018-03-19 23:17:07 +01:00
battery.c
Merge branches 'acpi-battery', 'acpi-doc' and 'acpi-pmic'
2018-04-02 10:58:13 +02:00
bgrt.c
ACPI: BGRT: constify attribute_group structures
2017-07-04 22:15:20 +02:00
blacklist.c
dmi: Mark all struct dmi_system_id instances const
2017-09-14 11:59:30 +02:00
bus.c
ACPICA: Rename a global for clarity, no functional change
2018-03-18 18:52:00 +01:00
button.c
ACPI: button: Add a LID switch blacklist and add 1 model to it
2017-12-13 01:05:02 +01:00
cm_sbs.c
…
container.c
…
cppc_acpi.c
ACPI / CPPC: Update all pr_(debug/err) messages to log the susbspace id
2018-02-22 22:54:00 +01:00
custom_method.c
treewide: Align function definition open/close braces
2018-03-26 11:13:09 +02:00
debugfs.c
…
device_pm.c
ACPI / PM: Allow deeper wakeup power states with no _SxD nor _SxW
2018-03-20 10:27:09 +01:00
device_sysfs.c
treewide: Use DEVICE_ATTR_RO
2018-01-09 16:34:34 +01:00
dock.c
ACPI: Mark expected switch fall-throughs
2017-11-09 00:55:16 +01:00
ec_sys.c
ACPI: EC: Fix debugfs_create_*() usage
2018-01-04 13:54:51 +01:00
ec.c
ACPI / EC: Restore polling during noirq suspend/resume phases
2018-02-12 10:29:31 +01:00
event.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
evged.c
ACPI: GED: unregister interrupts during shutdown
2017-12-16 03:05:37 +01:00
fan.c
treewide: Align function definition open/close braces
2018-03-26 11:13:09 +02:00
glue.c
IOMMU Updates for Linux v4.12
2017-05-09 15:15:47 -07:00
hed.c
…
internal.h
ACPI: EC: Fix debugfs_create_*() usage
2018-01-04 13:54:51 +01:00
ioapic.c
ACPI: fix whitespace in pr_fmt() to align log entries
2017-06-22 02:18:20 +02:00
irq.c
ACPI / irq: Fix return code of acpi_gsi_to_irq()
2017-07-12 13:11:49 +02:00
Kconfig
Merge branches 'acpi-osi', 'acpi-scan', 'acpi-tad', 'acpi-video' and 'acpi-misc'
2018-04-02 10:59:01 +02:00
Makefile
ACPI: Add Time and Alarm Device (TAD) driver
2018-03-20 10:36:04 +01:00
numa.c
acpi, numa: fix pxm to online numa node associations
2018-03-15 19:49:14 -07:00
nvs.c
…
osi.c
ACPI / OSI: Add OEM _OSI strings to disable NVidia RTD3
2018-03-18 23:42:33 +01:00
osl.c
acpi: Introduce acpi_arch_get_root_pointer() for getting rsdp address
2018-02-26 08:43:20 +01:00
pci_irq.c
ACPI / PCI: fix GIC irq model default PCI IRQ polarity
2016-09-10 02:50:50 +02:00
pci_link.c
ACPI / PCI: pci_link: Allow the absence of _PRS and change log level
2018-02-27 17:15:39 +01:00
pci_mcfg.c
PCI/ACPI: Add ThunderX pass2.x 2nd node MCFG quirk
2017-04-24 11:58:56 -05:00
pci_root.c
PCI/ACPI: Request LTR control from platform before using it
2018-04-23 08:18:44 -05:00
pci_slot.c
dmi: Mark all struct dmi_system_id instances const
2017-09-14 11:59:30 +02:00
power.c
ACPI / power: constify attribute_group structures
2017-07-04 22:15:14 +02:00
proc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
processor_core.c
Revert"x86/acpi: Enable MADT APIs to return disabled apicids"
2017-03-11 14:41:18 +01:00
processor_driver.c
ACPI: processor: use dev_dbg() instead of dev_warn() when CPPC probe failed
2017-07-27 01:51:06 +02:00
processor_idle.c
More ACPI updates for v4.16-rc1
2018-02-09 09:44:25 -08:00
processor_pdc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
processor_perflib.c
xen/acpi: upload _PSD info for non Dom0 CPUs too
2018-03-21 08:29:13 -04:00
processor_thermal.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
processor_throttling.c
acpi/processor: Prevent cpu hotplug deadlock
2017-05-26 10:10:47 +02:00
property.c
device property: Constify device_get_match_data()
2018-02-12 10:41:11 +01:00
reboot.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
resource.c
ACPI: Mark expected switch fall-throughs
2017-11-09 00:55:16 +01:00
sbs.c
battery: Add the battery hooking API
2018-02-21 23:27:13 +01:00
sbshc.c
ACPI: sbshc: remove raw pointer from printk() message
2018-02-08 09:50:08 +01:00
sbshc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scan.c
pci-v4.17-changes
2018-04-06 18:31:06 -07:00
sleep.c
Power management updates for 4.17-rc1
2018-04-03 10:45:39 -07:00
sleep.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
spcr.c
ACPI: SPCR: Mark expected switch fall-through in acpi_parse_spcr
2018-02-12 10:31:26 +01:00
sysfs.c
ACPI: sysfs: Make ACPI GPE mask kernel parameter cover all GPEs
2017-12-13 01:11:33 +01:00
tables.c
ACPI: add NFIT and HMAT to the initrd override list
2018-02-22 22:46:35 +01:00
thermal.c
dmi: Mark all struct dmi_system_id instances const
2017-09-14 11:59:30 +02:00
utils.c
ACPI: utils: Introduce acpi_dev_get_first_match_name()
2018-01-10 00:41:43 +01:00
video_detect.c
ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E
2018-03-20 10:38:17 +01:00
wakeup.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00