kernel/git/next/linux-next.git/drivers/thunderbolt/tb_regs.h, branch master

thunderbolt: Increase Notification Timeout to 255 ms for USB4 routers

2026-05-20T09:54:35+00:00

Currently we set the Notification Timeout field in ROUTER_CS_4 for USB4 routers to 10 ms, which is unnecessarily short and may cause unnecessary retransmissions of Hot Plug packets by the router in case of slow software response. Increase the timeout to 255 ms, aligning with Thunderbolt 3 routers and providing adequate time for software to process Hot Plug Events. While there, fix the comment describing the Notification Timeout field to match the USB4 specification. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Verify Router Ready bit is set after router enumeration

2026-05-20T09:54:34+00:00

The USB4 Connection Manager guide specifies that after enumerating a router, the Connection Manager shall verify that the Router Ready bit (ROUTER_CS_6.RR) has been set to ensure hardware configuration has completed. Currently, this step is missing from the enumeration sequence. Add this check to follow the Connection Manager guide more closely. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Verify PCIe adapter in detect state before tunnel setup

2026-05-20T09:54:34+00:00

The USB4 Connection Manager guide suggests that a PCIe downstream and PCIe upstream adapters of the USB4 router is in the Detect state before setting up a PCIe tunnel. Add this check by verifying the LTSSM field in ADP_PCIE_CS_0 before tunnel setup. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Fix typos in tb_regs.h

2025-11-17T07:24:24+00:00

Fix typos in tb_regs.h. No functional changes. Signed-off-by: Alan Borzeszkowski Signed-off-by: Mika Westerberg

Merge tag 'thunderbolt-for-v6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next

2024-03-02T19:14:03+00:00

Mika writes: thunderbolt: Changes for v6.9 merge window This includes following USB4/Thunderbolt changes for the v6.9 merge window: - Reset the topology also for USB4 v1 routers on driver load - DisplayPort tunneling and bandwidth allocation mode improvements - Tracepoint support for the control channel - Couple of minor fixes and cleanups. All these have been in linux-next with no reported issues. * tag 'thunderbolt-for-v6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: (23 commits) thunderbolt: Constify the struct device_type usage thunderbolt: Add trace events support for the control channel thunderbolt: Keep the domain powered when USB4 port is in redrive mode thunderbolt: Improve DisplayPort tunnel setup process to be more robust thunderbolt: Calculate DisplayPort tunnel bandwidth after DPRX capabilities read thunderbolt: Reserve released DisplayPort bandwidth for a group for 10 seconds thunderbolt: Introduce tb_tunnel_direction_downstream() thunderbolt: Re-order bandwidth group functions thunderbolt: Fail the failed bandwidth request properly thunderbolt: Log an error if DPTX request is not cleared thunderbolt: Handle bandwidth allocation mode disable request thunderbolt: Re-calculate estimated bandwidth when allocation mode is enabled thunderbolt: Use DP_LOCAL_CAP for maximum bandwidth calculation thunderbolt: Correct typo in host_reset parameter thunderbolt: Skip discovery also in USB4 v2 host thunderbolt: Reset only non-USB4 host routers in resume thunderbolt: Remove usage of the deprecated ida_simple_xx() API thunderbolt: Fix rollback in tb_port_lane_bonding_enable() for lane 1 thunderbolt: Fix XDomain rx_lanes_show and tx_lanes_show thunderbolt: Reset topology created by the boot firmware ...

thunderbolt: Fix setting the CNS bit in ROUTER_CS_5

2024-01-29T07:48:40+00:00

The bit 23, CM TBT3 Not Supported (CNS), in ROUTER_CS_5 indicates whether a USB4 Connection Manager is TBT3-Compatible and should be: 0b for TBT3-Compatible 1b for Not TBT3-Compatible Fixes: b04079837b20 ("thunderbolt: Add initial support for USB4") Cc: stable@vger.kernel.org Signed-off-by: Mohammad Rahimi Signed-off-by: Mika Westerberg

thunderbolt: Make tb_switch_reset() support Thunderbolt 2, 3 and USB4 routers

2024-01-22T11:21:06+00:00

Currently tb_switch_reset() only did something for Thunderbolt 1 devices. Expand this to support all generations, including USB4, and both host and device routers. Signed-off-by: Sanath S Signed-off-by: Mika Westerberg

thunderbolt: Introduce tb_port_reset()

2024-01-22T11:21:06+00:00

Introduce a function that issues Downstream Port Reset to a USB4 port. This supports Thunderbolt 2, 3 and USB4 routers. Signed-off-by: Sanath S Signed-off-by: Mika Westerberg

thunderbolt: Add support for asymmetric link

2023-10-20T15:18:01+00:00

USB4 v2 spec defines a Gen 4 link that can operate as an aggregated symmetric (80/80G) or asymmetric (120/40G). When the link is asymmetric, the USB4 port on one side of the link operates with three TX lanes and one RX lane, while the USB4 port on the opposite side of the link operates with three RX lanes and one TX lane. Add support for the asymmetric link and provide functions that can be used to transition the link to asymmetric and back. Signed-off-by: Gil Fine Co-developed-by: Mika Westerberg Signed-off-by: Mika Westerberg

thunderbolt: Set path power management packet support bit for USB4 v2 routers

2023-10-20T15:18:01+00:00

USB4 v2 spec allows USB4 links that are part of a pass through tunnel (such as DisplayPort and USB 3.x Gen T) to enter lower CL states, which provide better power management. For this USB4 v2 routers in their path config space of lane 0 adapter include a new bit PMPS (PM packet support) that needs to be set. Signed-off-by: Mika Westerberg