releases/4.18.11/revert-pci-add-acs-quirk-for-intel-300-series.patch

   1 From 50ca031b51106b1b46162d4e9ecccb7edc95682f Mon Sep 17 00:00:00 2001
   2 From: Mika Westerberg <mika.westerberg@linux.intel.com>
   3 Date: Wed, 5 Sep 2018 14:09:54 +0300
   4 Subject: Revert "PCI: Add ACS quirk for Intel 300 series"
   5
   6 From: Mika Westerberg <mika.westerberg@linux.intel.com>
   7
   8 commit 50ca031b51106b1b46162d4e9ecccb7edc95682f upstream.
   9
  10 This reverts f154a718e6cc ("PCI: Add ACS quirk for Intel 300 series").
  11
  12 It turns out that erratum "PCH PCIe* Controller Root Port (ACSCTLR) Appear
  13 As Read Only" has been fixed in 300 series chipsets, even though the
  14 datasheet [1] claims otherwise.  To make ACS work properly on 300 series
  15 root ports, revert the faulty commit.
  16
  17 [1] https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/300-series-c240-series-chipset-pch-spec-update.pdf
  18
  19 Fixes: f154a718e6cc ("PCI: Add ACS quirk for Intel 300 series")
  20 Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
  21 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  22 Cc: stable@vger.kernel.org      # v4.18+
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  24
  25 ---
  26  drivers/pci/quirks.c |    6 ------
  27  1 file changed, 6 deletions(-)
  28
  29 --- a/drivers/pci/quirks.c
  30 +++ b/drivers/pci/quirks.c
  31 @@ -4235,11 +4235,6 @@ static int pci_quirk_qcom_rp_acs(struct
  32   *
  33   * 0x9d10-0x9d1b PCI Express Root port #{1-12}
  34   *
  35 - * The 300 series chipset suffers from the same bug so include those root
  36 - * ports here as well.
  37 - *
  38 - * 0xa32c-0xa343 PCI Express Root port #{0-24}
  39 - *
  40   * [1] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-2.html
  41   * [2] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-1.html
  42   * [3] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-spec-update.html
  43 @@ -4257,7 +4252,6 @@ static bool pci_quirk_intel_spt_pch_acs_
  44         case 0xa110 ... 0xa11f: case 0xa167 ... 0xa16a: /* Sunrise Point */
  45         case 0xa290 ... 0xa29f: case 0xa2e7 ... 0xa2ee: /* Union Point */
  46         case 0x9d10 ... 0x9d1b: /* 7th & 8th Gen Mobile */
  47 -       case 0xa32c ... 0xa343:                         /* 300 series */
  48                 return true;
  49         }
  50