releases/4.0.8/x86-pci-use-host-bridge-_crs-info-on-foxconn-k8m890-8237a.patch

   1 From 1dace0116d0b05c967d94644fc4dfe96be2ecd3d Mon Sep 17 00:00:00 2001
   2 From: Bjorn Helgaas <bhelgaas@google.com>
   3 Date: Tue, 9 Jun 2015 18:54:07 -0500
   4 Subject: x86/PCI: Use host bridge _CRS info on Foxconn K8M890-8237A
   5
   6 From: Bjorn Helgaas <bhelgaas@google.com>
   7
   8 commit 1dace0116d0b05c967d94644fc4dfe96be2ecd3d upstream.
   9
  10 The Foxconn K8M890-8237A has two PCI host bridges, and we can't assign
  11 resources correctly without the information from _CRS that tells us which
  12 address ranges are claimed by which bridge.  In the bugs mentioned below,
  13 we incorrectly assign a sound card address (this example is from 1033299):
  14
  15   bus: 00 index 2 [mem 0x80000000-0xfcffffffff]
  16   ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7f])
  17   pci_root PNP0A08:00: host bridge window [mem 0x80000000-0xbfefffff] (ignored)
  18   pci_root PNP0A08:00: host bridge window [mem 0xc0000000-0xdfffffff] (ignored)
  19   pci_root PNP0A08:00: host bridge window [mem 0xf0000000-0xfebfffff] (ignored)
  20   ACPI: PCI Root Bridge [PCI1] (domain 0000 [bus 80-ff])
  21   pci_root PNP0A08:01: host bridge window [mem 0xbff00000-0xbfffffff] (ignored)
  22   pci 0000:80:01.0: [1106:3288] type 0 class 0x000403
  23   pci 0000:80:01.0: reg 10: [mem 0xbfffc000-0xbfffffff 64bit]
  24   pci 0000:80:01.0: address space collision: [mem 0xbfffc000-0xbfffffff 64bit] conflicts with PCI Bus #00 [mem 0x80000000-0xfcffffffff]
  25   pci 0000:80:01.0: BAR 0: assigned [mem 0xfd00000000-0xfd00003fff 64bit]
  26   BUG: unable to handle kernel paging request at ffffc90000378000
  27   IP: [<ffffffffa0345f63>] azx_create+0x37c/0x822 [snd_hda_intel]
  28
  29 We assigned 0xfd_0000_0000, but that is not in any of the host bridge
  30 windows, and the sound card doesn't work.
  31
  32 Turn on pci=use_crs automatically for this system.
  33
  34 Link: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368
  35 Link: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299
  36 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  37 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  38
  39 ---
  40  arch/x86/pci/acpi.c |   11 +++++++++++
  41  1 file changed, 11 insertions(+)
  42
  43 --- a/arch/x86/pci/acpi.c
  44 +++ b/arch/x86/pci/acpi.c
  45 @@ -81,6 +81,17 @@ static const struct dmi_system_id pci_cr
  46                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  47                 },
  48         },
  49 +       /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
  50 +       /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
  51 +       {
  52 +               .callback = set_use_crs,
  53 +               .ident = "Foxconn K8M890-8237A",
  54 +               .matches = {
  55 +                       DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
  56 +                       DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
  57 +                       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  58 +               },
  59 +       },
  60
  61         /* Now for the blacklist.. */
  62