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63cd736f44
linux/drivers/pci
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Bjorn Helgaas 63cd736f44 PCI: Avoid broken MSI on SB600 USB devices 
Some ATI SB600 USB adapters advertise MSI, but if INTx is disabled by
setting PCI_COMMAND_INTX_DISABLE, MSI doesn't work either.  The PCI/PCIe
specs do not require software to set PCI_COMMAND_INTX_DISABLE when enabling
MSI, but Linux has done that for many years.

Mick reported that 306c54d0ed ("usb: hcd: Try MSI interrupts on PCI
devices") broke these devices.  Prior to 306c54d0ed, they used INTx.
Starting with 306c54d0ed, they use MSI, and and the fact that Linux sets
PCI_COMMAND_INTX_DISABLE means both INTx and MSI are disabled on these
devices.

Avoid this SB600 defect by disabling MSI so we use INTx as before.

Fixes: 306c54d0ed ("usb: hcd: Try MSI interrupts on PCI devices")
Link: https://lore.kernel.org/r/20220321183446.1108325-1-helgaas@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215690
Link: https://lore.kernel.org/all/PxIByDyBRcsbpcmVhGSNDFAoUcMmb78ctXCkw6fbpx25TGlCHvA6SJjjFkNr1FfQZMntYPTNyvEnblxzAZ8a6jP9ddLpKeCN6Chi_2FuexU=@protonmail.com/
Link: https://lore.kernel.org/r/20220314101448.90074-1-andriy.shevchenko@linux.intel.com
BugLink: https://lore.kernel.org/all/20200702143045.23429-1-andriy.shevchenko@linux.intel.com/
Reported-by: Mick Lorain <micklorain@protonmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2022-03-21 15:23:14 -05:00
..
controller bitmap patches for 5.17-rc1 2022-01-23 06:20:44 +02:00
endpoint Merge branch 'pci/misc' 2022-01-13 09:57:52 -06:00
hotplug Merge branch 'pci/errors' 2022-01-13 09:57:52 -06:00
msi PCI/MSI: Unbreak pci_irq_get_affinity() 2021-12-18 20:33:21 +01:00
pcie Merge branch 'pci/errors' 2022-01-13 09:57:52 -06:00
switch PCI/switchtec: Declare local state_names[] as static 2021-11-19 12:14:02 -06:00
access.c PCI: Use PCI_ERROR_RESPONSE to identify config read errors 2021-11-18 14:31:43 -06:00
ats.c PCI: Allow PASID on fake PCIe devices without TLP prefixes 2021-08-26 14:21:42 -05:00
bus.c
ecam.c PCI: Dynamically map ECAM regions 2021-06-16 17:20:40 -05:00
host-bridge.c PCI: VMD: ACPI: Make ACPI companion lookup work for VMD bus 2021-09-02 17:59:58 +02:00
iov.c Revert "PCI: Use to_pci_driver() instead of pci_dev->driver" 2021-11-11 13:36:22 -06:00
irq.c
Kconfig PCI: hv: Add arm64 Hyper-V vPCI support 2022-01-12 08:24:29 -06:00
Makefile PCI/MSI: Move code into a separate directory 2021-12-09 11:52:22 +01:00
mmap.c
of.c PCI: Correct misspelled words 2022-01-07 20:43:23 -06:00
p2pdma.c pci-v5.17-changes 2022-01-16 08:08:11 +02:00
pci-acpi.c Merge branch 'pm-pci' 2021-11-02 19:06:30 +01:00
pci-bridge-emul.c Merge branch 'remotes/lorenzo/pci/bridge-emul' 2022-01-13 09:57:51 -06:00
pci-bridge-emul.h PCI: pci-bridge-emul: Add PCIe Root Capabilities Register 2021-08-05 10:51:49 +01:00
pci-driver.c Revert "PCI: Use to_pci_driver() instead of pci_dev->driver" 2021-11-11 13:36:22 -06:00
pci-label.c PCI/sysfs: Use sysfs_emit() and sysfs_emit_at() in "show" functions 2021-06-03 22:14:47 -05:00
pci-mid.c PCI: PM: Do not use pci_platform_pm_ops for Intel MID PM 2021-09-27 17:13:21 +02:00
pci-pf-stub.c
pci-stub.c
pci-sysfs.c PCI/sysfs: Use pci_irq_vector() 2021-12-09 11:52:21 +01:00
pci.c pci-v5.17-changes 2022-01-16 08:08:11 +02:00
pci.h pci-v5.16-changes 2021-11-06 14:36:12 -07:00
probe.c pci-v5.17-changes 2022-01-16 08:08:11 +02:00
proc.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
quirks.c PCI: Avoid broken MSI on SB600 USB devices 2022-03-21 15:23:14 -05:00
remove.c PCI: Remove reset_fn field from pci_dev 2021-08-17 17:44:38 -05:00
rom.c PCI: Prefer 'unsigned int' over bare 'unsigned' 2021-10-27 13:41:22 -05:00
search.c PCI: Remove WARN_ON(in_interrupt()) 2021-02-10 16:46:29 -06:00
setup-bus.c PCI: Prefer 'unsigned int' over bare 'unsigned' 2021-10-27 13:41:22 -05:00
setup-irq.c PCI: Tidy comments 2021-09-28 13:43:17 -05:00
setup-res.c PCI: Work around Intel I210 ROM BAR overlap defect 2022-01-11 09:33:10 -06:00
slot.c PCI/sysfs: Use default_groups in kobj_type for slot attrs 2021-12-29 13:42:04 -06:00
syscall.c PCI: Return int from pciconfig_read() syscall 2021-08-03 16:55:48 -05:00
vc.c
vpd.c PCI/VPD: Use pci_read_vpd_any() in pci_vpd_size() 2021-10-25 19:12:23 -05:00
xen-pcifront.c xen/pcifront: Rework MSI handling 2021-12-16 22:22:18 +01:00