[v4,00/10] Improve link speed presentation process

In this series:
1. Add 32 GT/s decoding in some macros as a complementary
2. Remove redundancy in speed presentation process and improve the codes.

Currently We use switch-case statements to acquire the speed
string according to the pci bus speed in current_link_speed_show()
and pcie_get_speed_cap(). It leads to redundant and when new
standard comes, we have to add cases in the related functions,
which is easy to omit at somewhere.

Abstract the judge statements out. Use macros and pci speed
arrays instead. Then only the macros and arrays need to be
extended when next generation comes.

Link:
https://lore.kernel.org/linux-pci/20200113211728.GA113776@google.com/
https://lore.kernel.org/linux-pci/20200114224909.GA19633@google.com/

change since v3:
1. Use pcie_link_speed[] to decode link speed in brcmstb PCIe controller
2. fix the compile error in pcie-brcmstb.c reported by kbuild test robot
Link: https://lore.kernel.org/linux-pci/5e487ee7.lOkk8mDzWylEn16z%25lkp@intel.com

change since v2:
1. revert split "PCI: Make pci_bus_speed_strings[] public" from the series
and split into two patches. And modify the description as suggested.
2. split "PCI: Refactor bus_speed_read() with PCI_SPEED2STR macro" to
two patches.
Link: https://lore.kernel.org/linux-pci/20200212223133.GA177061@google.com/

change since v1:
1. split "PCI: Make pci_bus_speed_strings[] public" from the series
2. split v1 PATCH 4 to two patches as suggested
3. modify some description in commit as suggested


Yicong Yang (10):
  PCI: add 32 GT/s decoding in some macros
  PCI: Make pci_bus_speed_strings[] public
  PCI: Remove PCIe suffix in pci_bus_speed_strings[]
  PCI: Add comments for link speed info arrays
  PCI: brcmstb: Use pcie_link_speed[] to decode link speed
  PCI: Refactor and rename PCIE_SPEED2STR macro
  PCI: Refactor bus_speed_read() with PCI_SPEED2STR macro
  PCI: Add PCIe suffix when display PCIe slot bus speed
  PCI: Add PCIE_LNKCAP2_SLS2SPEED macro
  PCI: Reduce redundancy in current_link_speed_show()

 drivers/pci/controller/pcie-brcmstb.c |  2 +-
 drivers/pci/pci-sysfs.c               | 26 ++++-------------------
 drivers/pci/pci.c                     | 23 +++++++--------------
 drivers/pci/pci.h                     | 23 ++++++++++++++-------
 drivers/pci/probe.c                   | 38 ++++++++++++++++++++++++++++++++++
 drivers/pci/slot.c                    | 39 +++--------------------------------
 6 files changed, 69 insertions(+), 82 deletions(-)

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2.8.1