target/linux/generic/pending-5.4/810-pci_disable_common_quirks.patch

   1 From: Gabor Juhos <juhosg@openwrt.org>
   2 Subject: debloat: add kernel config option to disabling common PCI quirks
   3
   4 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
   5 ---
   6  drivers/pci/Kconfig  | 6 ++++++
   7  drivers/pci/quirks.c | 6 ++++++
   8  2 files changed, 12 insertions(+)
   9
  10 --- a/drivers/pci/Kconfig
  11 +++ b/drivers/pci/Kconfig
  12 @@ -115,6 +115,13 @@ config XEN_PCIDEV_FRONTEND
  13            The PCI device frontend driver allows the kernel to import arbitrary
  14            PCI devices from a PCI backend to support PCI driver domains.
  15
  16 +config PCI_DISABLE_COMMON_QUIRKS
  17 +       bool "PCI disable common quirks"
  18 +       depends on PCI
  19 +       help
  20 +         If you don't know what to do here, say N.
  21 +
  22 +
  23  config PCI_ATS
  24         bool
  25
  26 --- a/drivers/pci/quirks.c
  27 +++ b/drivers/pci/quirks.c
  28 @@ -206,6 +206,7 @@ static void quirk_mmio_always_on(struct
  29  DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_ANY_ID, PCI_ANY_ID,
  30                                 PCI_CLASS_BRIDGE_HOST, 8, quirk_mmio_always_on);
  31
  32 +#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
  33  /*
  34   * The Mellanox Tavor device gives false positive parity errors.  Mark this
  35   * device with a broken_parity_status to allow PCI scanning code to "skip"
  36 @@ -3321,6 +3322,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_I
  37  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65f9, quirk_intel_mc_errata);
  38  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x65fa, quirk_intel_mc_errata);
  39
  40 +#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
  41 +
  42  /*
  43   * Ivytown NTB BAR sizes are misreported by the hardware due to an erratum.
  44   * To work around this, query the size it should be configured to by the
  45 @@ -3346,6 +3349,8 @@ static void quirk_intel_ntb(struct pci_d
  46  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e08, quirk_intel_ntb);
  47  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);
  48
  49 +#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
  50 +
  51  /*
  52   * Some BIOS implementations leave the Intel GPU interrupts enabled, even
  53   * though no one is handling them (e.g., if the i915 driver is never
  54 @@ -3384,6 +3389,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
  55  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
  56  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0152, disable_igfx_irq);
  57
  58 +#endif /* !CONFIG_PCI_DISABLE_COMMON_QUIRKS */
  59 +
  60  /*
  61   * PCI devices which are on Intel chips can skip the 10ms delay
  62   * before entering D3 mode.