linux/drivers/pci
Lucas Stach 3e3e406e38 PCI: imx6: Put LTSSM in "Detect" state before disabling it
This fixes a boot hang observed when the bootloader already enabled the
PCIe link for its own use.  The fundamental problem is that Freescale
forgot to wire up the core reset, so software doesn't have a sane way to
get the core into a defined state.

According to the DW PCIe core reference manual, configuration of the core
may only happen when the LTSSM is disabled, so this is one of the first
things we need to do.  Apparently this isn't safe to do when the LTSSM is in
any state other than "detect" as we observe an instant machine hang when
trying to do so while the link is already up.

As a workaround, force LTSSM into detect state right before hitting the
disable switch.  There is still a race window because the LTSSM may
transition out of "detect" before we can disable it, but it's the best
we can do for now.

[bhelgaas: mention race window]
Link: http://lkml.kernel.org/r/1406830565-23450-3-git-send-email-l.stach@pengutronix.de
Reported-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>
2014-09-04 07:32:21 -06:00
..
host PCI: imx6: Put LTSSM in "Detect" state before disabling it 2014-09-04 07:32:21 -06:00
hotplug The branch contains the following device tree changes the v3.17 merge 2014-08-14 09:53:39 -06:00
pcie Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-08-04 17:21:59 -07:00
access.c
ats.c
bus.c
host-bridge.c
hotplug-pci.c
htirq.c PCI changes for the v3.16 merge window (part 2): 2014-06-12 13:20:24 -07:00
ioapic.c PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use 2014-08-12 12:15:14 -06:00
iov.c
irq.c
Kconfig
Makefile
msi.c PCI/MSI: Use irq_get_msi_desc() to simplify code 2014-07-16 14:49:02 -06:00
of.c
pci-acpi.c Merge branches 'acpi-pnp' and 'acpi-pci' 2014-07-27 23:55:35 +02:00
pci-driver.c PCI: Add pci_fixup_suspend_late quirk pass 2014-06-19 14:08:41 -07:00
pci-label.c ACPI / PCI: Fix sysfs acpi_index and label errors 2014-07-02 15:27:08 -06:00
pci-stub.c
pci-sysfs.c
pci.c PCI changes for the v3.17 merge window: 2014-08-04 09:29:37 -07:00
pci.h
probe.c
proc.c
quirks.c Char / Misc driver patches for 3.17-rc1 2014-08-04 17:32:24 -07:00
remove.c
rom.c
search.c
setup-bus.c PCI: Support BAR sizes up to 128GB 2014-07-08 16:17:26 -06:00
setup-irq.c
setup-res.c PCI: Tidy resource assignment messages 2014-07-08 16:29:08 -06:00
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c