Eric Lee / linux-smarc-t335x-v3.2

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Commit 73a74ed3a6f8fcb817fdffa2c2718f96d0108b7f

Authored by Ivan Kokshaysky
Committed by Greg Kroah-Hartman
1 parent 3c92c57af9
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

PCI: i386: fixup for Siemens Nixdorf AG FSC Multiprocessor Interrupt Controllers 

Wolfgang gets:

 PCI: Cannot allocate resource region 0 of device 0000:00:04.0
 PCI: Error while updating region 0000:00:04.0/0 (a8008000 != fec08000)

Note that the BAR seems to have high address bits hardwired to fec00000.
And device 0000:00:04.0 is

 00:04.0 System peripheral: Siemens Nixdorf AG FSC Multiprocessor Interrupt Controller (rev 02)

I'd guess that when we try to reassign this resource, PCI interrupts might
just stop working. This could explain SCSI timeouts and other weird things.

Cc: Wolfgang Erig <Wolfgang.Erig@gmx.de>
Cc: Chuck Ebbert <cebbert@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Showing 1 changed file with 11 additions and 0 deletions Side-by-side Diff

arch/i386/pci/fixup.c
Diff comments   View file @ 73a74ed
... ... @@ -436,4 +436,15 @@
436 436 pci_early_fixup_cyrix_5530);
437 437 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY,
438 438 pci_early_fixup_cyrix_5530);
  439 +
  440 +/*
  441 + * Siemens Nixdorf AG FSC Multiprocessor Interrupt Controller:
  442 + * prevent update of the BAR0, which doesn't look like a normal BAR.
  443 + */
  444 +static void __devinit pci_siemens_interrupt_controller(struct pci_dev *dev)
  445 +{
  446 + dev->resource[0].flags |= IORESOURCE_PCI_FIXED;
  447 +}
  448 +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SIEMENS, 0x0015,
  449 + pci_siemens_interrupt_controller);