kernel/linux.git/drivers/thunderbolt/switch.c, branch v5.18.2

thunderbolt: Do not make DROM read success compulsory

2022-03-04T14:10:36+00:00

The USB4 specification doesn't make any requirements that reading a device router's DROM is needed for the operation of the device. Other connection manager solutions don't necessarily read it or gate the usability of the device on whether it was read. So make failures when reading the DROM show warnings but not fail the initialization of the router. Signed-off-by: Mario Limonciello Signed-off-by: Mika Westerberg

thunderbolt: Do not resume routers if UID is not set

2022-03-04T14:10:36+00:00

Routers might not have a UID set if the DROM read failed during initialization previously. Normally upon resume the UID is re-read to confirm it's the same device connected. * If the DROM read failed during init but then succeeded during resume it could either be a new device or faulty device * If the DROM read failed during init and also failed during resume it might be a different device plugged in all together. Detect this situation and prevent re-using the same configuration in these cirucmstances. Signed-off-by: Mario Limonciello Signed-off-by: Mika Westerberg

thunderbolt: Add internal xHCI connect flows for Thunderbolt 3 devices

2022-02-02T10:56:51+00:00

Both Alpine Ridge and Titan Ridge require special flows in order to activate the internal xHCI controller when there is USB device connected to the downstream type-C port. This implements the missing flows for both. Signed-off-by: Mika Westerberg

thunderbolt: Add module parameter for CLx disabling

2021-12-28T07:43:56+00:00

Add a module parameter that allows user to completely disable CLx functionality in case problems are found. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Enable CL0s for Intel Titan Ridge

2021-12-28T07:43:56+00:00

Low power link states (called collectively CLx) are used to reduce transmitter and receiver power when a high-speed lane is idle. The simplest one being called CL0s. Follow what we already do for USB4 device routers and enable CL0s for Intel Titan Ridge device router too. This allows better thermal management. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Implement TMU time disruption for Intel Titan Ridge

2021-12-22T14:13:14+00:00

Intel Titan Ridge based routers have slightly different flow for time disruption than USB4 compliant routers. This makes it work on Titan Ridge too. Needed to enable link low power states on Titan Ridge. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Move usb4_switch_wait_for_bit() to switch.c

2021-12-22T14:13:14+00:00

Currently usb4_switch_wait_for_bit() used only in usb4.c Moving to switch.c to call it from other files. Also change the prefix to "tb_" to follow to the naming convention. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Add CL0s support for USB4 routers

2021-12-22T14:13:14+00:00

In this patch we add enabling of CL0s - a low power state of the link. Low power states (called collectively CLx) are used to reduce transmitter and receiver power when a high-speed lane is idle. For now, we add support only for first low power state: CL0s. We enable it, if both sides of the link support it, and only for the first hop router. (i.e. the first device that connected to the host router). This is needed for better thermal management. Signed-off-by: Gil Fine Signed-off-by: Mika Westerberg

thunderbolt: Add debug logging of DisplayPort resource allocation

2021-12-07T12:18:34+00:00

Add more debugging around DP resource allocation/de-allocation. Signed-off-by: Mika Westerberg

thunderbolt: Do not program path HopIDs for USB4 routers

2021-12-07T12:18:33+00:00

These fields are marked read-only for USB4 routers so do not touch them in that case. Update the kernel-doc of tb_dp_port_set_hops() to reflect this too. Signed-off-by: Mika Westerberg