[0/2] Add support for downstream port reset(DPR)

Message

Sanath S Dec. 12, 2023, 2 p.m. UTC

Tunnels created by boot firmware results in incorrect PCI resource
allocation, which results in failure of extending daisy chain.

This series aligns with windows behaviour of performing a teardown of
tunnels and resetting the downstream ports using DPR during the init
sequence.

Sanath S (2):
  thunderbolt: Introduce tb_switch_reset_ports(), tb_port_reset() and
    usb4_port_reset()
  thunderbolt: Teardown tunnels and reset downstream ports created by
    boot firmware

 drivers/thunderbolt/switch.c  |  31 ++++++++
 drivers/thunderbolt/tb.c      | 137 ++--------------------------------
 drivers/thunderbolt/tb.h      |   2 +
 drivers/thunderbolt/tb_regs.h |   1 +
 drivers/thunderbolt/usb4.c    |  39 ++++++++++
 5 files changed, 80 insertions(+), 130 deletions(-)