linux/drivers/pci
John W. Linville 064b53dbcc [PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it
Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration
(including BARs) when transitioning from D3hot->D0.  This leaves such
a device in an inaccessible state.  The patch below causes the BARs
to be restored when enabling such a device, so that its driver will
be able to access it.

The patch also adds pci_restore_bars as a new global symbol, and adds a
correpsonding EXPORT_SYMBOL_GPL for that.

Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a
(re)boot.  Most drivers call pci_enable_device very early, so devices
left in D3hot that lose configuration during the D3hot->D0 transition
will be inaccessible to their drivers.

Drivers could be modified to account for this, but it would
be difficult to know which drivers need modification.  This is
especially true since often many devices are covered by the same
driver.  It likely would be necessary to replicate code across dozens
of drivers.

The patch below should trigger only when transitioning from D3hot->D0
(or at boot), and only for devices that have the "no soft reset" bit
cleared in the PM control register.  I believe it is safe to include
this patch as part of the PCI infrastructure.

The cleanest implementation of pci_restore_bars was to call
pci_update_resource.  Unfortunately, that does not currently exist
for the sparc64 architecture.  The patch below includes a null
implemenation of pci_update_resource for sparc64.

Some have expressed interest in making general use of the the
pci_restore_bars function, so that has been exported to GPL licensed
modules.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-08 14:57:24 -07:00
..
hotplug [PATCH] PCI Hotplug: use bus_slot number for name 2005-09-08 14:57:24 -07:00
pcie [PATCH] pm: more u32 vs. pm_message_t fixes 2005-07-07 18:23:43 -07:00
access.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
bus.c pci: make bus resource start address override minimum IO address 2005-08-02 14:55:40 -07:00
hotplug.c [PATCH] PCI: Remove newline from pci MODALIAS variable 2005-07-01 13:35:51 -07:00
Kconfig [PATCH] PCI: remove CONFIG_PCI_NAMES 2005-09-08 14:57:23 -07:00
Makefile [PATCH] PCI: remove CONFIG_PCI_NAMES 2005-09-08 14:57:23 -07:00
msi.c [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity 2005-09-07 16:57:15 -07:00
msi.h [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity 2005-09-07 16:57:15 -07:00
pci-acpi.c [ACPI] gut acpi_pci_choose_state() to avoid conflict 2005-07-11 23:54:14 -04:00
pci-driver.c [PATCH] PCI: Run PCI driver initialization on local node 2005-09-08 14:57:23 -07:00
pci-sysfs.c [PATCH] PCI: fix-pci-mmap-on-ppc-and-ppc64.patch 2005-06-27 21:52:45 -07:00
pci.c [PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it 2005-09-08 14:57:24 -07:00
pci.h [PATCH] PCI: fix quirk-6700-fix.patch 2005-08-16 21:06:24 -07:00
probe.c [PATCH] PCI: remove CONFIG_PCI_NAMES 2005-09-08 14:57:23 -07:00
proc.c [PATCH] PCI: remove CONFIG_PCI_NAMES 2005-09-08 14:57:23 -07:00
quirks.c [PATCH] via vt8237 apic bypass deassertion quirk 2005-09-05 00:06:10 -07:00
remove.c [PATCH] acpi bridge hotadd: Make the PCI remove routines safe for failed hot-plug 2005-06-27 21:52:41 -07:00
rom.c [PATCH] Fix PCI ROM mapping 2005-09-01 10:50:29 -07:00
search.c [IA64] hotplug/ia64: SN Hotplug Driver - pci_find_next_bus export 2005-07-06 15:28:40 -07:00
setup-bus.c [PATCH] x86: pci_assign_unassigned_resources() update 2005-08-30 11:14:48 -07:00
setup-irq.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup-res.c [PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it 2005-09-08 14:57:24 -07:00
syscall.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00