linux-sg2042/drivers/pci
Rafael J. Wysocki 5c7dd710f6 ACPI / PCI / PM: Fix device PM regression related to D3hot/D3cold
Commit 1cc0c998fd ("ACPI: Fix D3hot v D3cold confusion") introduced a
bug in __acpi_bus_set_power() and changed the behavior of
acpi_pci_set_power_state() in such a way that it generally doesn't work
as expected if PCI_D3hot is passed to it as the second argument.

First off, if ACPI_STATE_D3 (equal to ACPI_STATE_D3_COLD) is passed to
__acpi_bus_set_power() and the explicit_set flag is set for the D3cold
state, the function will try to execute AML method called "_PS4", which
doesn't exist.

Fix this by adding a check to ensure that the name of the AML method
to execute for transitions to ACPI_STATE_D3_COLD is correct in
__acpi_bus_set_power().  Also make sure that the explicit_set flag
for ACPI_STATE_D3_COLD will be set if _PS3 is present and modify
acpi_power_transition() to avoid accessing power resources for
ACPI_STATE_D3_COLD, because they don't exist.

Second, if PCI_D3hot is passed to acpi_pci_set_power_state() as the
target state, the function will request a transition to
ACPI_STATE_D3_HOT instead of ACPI_STATE_D3.  However,
ACPI_STATE_D3_HOT is now only marked as supported if the _PR3 AML
method is defined for the given device, which is rare.  This causes
problems to happen on systems where devices were successfully put
into ACPI D3 by pci_set_power_state(PCI_D3hot) which doesn't work
now.  In particular, some unused graphics adapters are not turned
off as a result.

To fix this issue restore the old behavior of
acpi_pci_set_power_state(), which is to request a transition to
ACPI_STATE_D3 (equal to ACPI_STATE_D3_COLD) if either PCI_D3hot or
PCI_D3cold is passed to it as the argument.

This approach is not ideal, because generally power should not
be removed from devices if PCI_D3hot is the target power state,
but since this behavior is relied on, we have no choice but to
restore it at the moment and spend more time on designing a
better solution in the future.

References: https://bugzilla.kernel.org/show_bug.cgi?id=43228
Reported-by: rocko <rockorequin@hotmail.com>
Reported-by: Cristian Rodríguez <crrodriguez@opensuse.org>
Reported-and-tested-by: Peter <lekensteyn@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-17 16:16:16 -07:00
..
hotplug PCI: make acpihp use __pci_remove_bus_device instead 2012-02-27 12:17:16 -08:00
pcie ASPM: Fix pcie devices with non-pcie children 2012-03-31 12:49:56 -07:00
.gitignore
Kconfig PCI: add a PCI resource reallocation config option 2012-02-24 09:38:59 -08:00
Makefile pci: frv architecture needs generic setup-bus infrastructure 2012-04-26 14:46:17 -04:00
access.c PCI: Introduce INTx check & mask API 2012-01-06 12:10:34 -08:00
ats.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
bus.c PCI: add struct pci_host_bridge_window with CPU/bus address offset 2012-02-23 20:19:00 -07:00
hotplug-pci.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
hotplug.c
htirq.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
ioapic.c pci, x86/io-apic: Allow PCI_IOAPIC to be user configurable on x86 2011-12-06 09:21:05 +01:00
iov.c PCI: Rename pci_remove_bus_device to pci_stop_and_remove_bus_device 2012-02-27 12:12:18 -08:00
irq.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
msi.c x86/PCI: Expand the x86_msi_ops to have a restore MSIs. 2012-01-06 14:02:26 -08:00
msi.h PCI: MSI: Move MSI-X entry definition to pci_regs.h 2010-12-23 12:53:07 -08:00
of.c PCI: OF: Don't crash when bridge parent is NULL. 2011-08-19 08:51:37 -07:00
pci-acpi.c ACPI / PCI / PM: Fix device PM regression related to D3hot/D3cold 2012-05-17 16:16:16 -07:00
pci-driver.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-03-23 14:02:12 -07:00
pci-label.c switch ->is_visible() to returning umode_t 2012-01-03 22:54:55 -05:00
pci-stub.c PCI: pci-stub: ignore zero-length id parameters 2010-12-23 12:53:52 -08:00
pci-sysfs.c PCI: Rename pci_remove_bus_device to pci_stop_and_remove_bus_device 2012-02-27 12:12:18 -08:00
pci.c PCI: Retry BARs restoration for Type 0 headers only 2012-04-16 18:33:35 -07:00
pci.h PCI: Move "pci reassigndev resource alignment" out of quirks.c 2012-02-24 14:37:26 -08:00
probe.c PCI: fix bridge I/O window bus-to-resource conversion 2012-03-20 10:41:27 -07:00
proc.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
quirks.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-03-23 14:02:12 -07:00
remove.c PCI: export __pci_remove_bus_device 2012-02-27 12:16:55 -08:00
rom.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
search.c PCI: use for_each_pci_dev() 2010-07-30 09:47:22 -07:00
setup-bus.c Merge branch 'pci-next+probe_only+bus2res-fb127cb' of git://github.com/bjorn-helgaas/linux into linux-next 2012-02-24 14:25:33 -08:00
setup-irq.c PCI: Make the struct pci_dev * argument of pci_fixup_irqs const. 2011-07-22 08:26:06 -07:00
setup-res.c PCI: Move "pci reassigndev resource alignment" out of quirks.c 2012-02-24 14:37:26 -08:00
slot.c pci: add module.h to files implicitly relying on its presence. 2011-10-31 19:31:23 -04:00
syscall.c headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
vpd.c pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:31:22 -04:00
xen-pcifront.c Two fixes for regressions: 2012-04-06 17:54:53 -07:00