kernel/linux.git/drivers/thunderbolt/usb4.c, branch v5.18.2

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 WRITE_ONLY and AUTHENTICATE_ONLY NVM operations for retimers

2021-06-01T07:53:32+00:00

The same way we support these two operations for USB4 routers we can extend the retimer NVM operations to support retimers also. Signed-off-by: Rajmohan Mani Co-developed-by: Mika Westerberg Signed-off-by: Mika Westerberg Reviewed-by: Greg Kroah-Hartman

thunderbolt: Allow router NVM authenticate separately

2021-06-01T07:53:32+00:00

It may be useful if the actual NVM authentication can be delayed to be run later, for instance when the user logs out. For this reason add a new NVM operation (AUHENTICATE_ONLY) that just triggers the authentication procedure over whatever was written to the NVM storage. This is not supported with Thunderbolt 1-3 devices, though. Signed-off-by: Mika Westerberg Reviewed-by: Greg Kroah-Hartman

thunderbolt: Add additional USB4 port operations for retimer access

2021-06-01T07:53:31+00:00

When accessing retimers when there is no cable connected we are going to need additional USB4 port operations. First the port needs to be put into offline mode, and then the sideband channel transactions must be enabled on the SBTX line. This adds support for these operations. Signed-off-by: Rajmohan Mani Signed-off-by: Mika Westerberg Reviewed-by: Greg Kroah-Hartman

thunderbolt: Add USB4 port devices

2021-06-01T07:53:31+00:00

Create devices for each USB4 port. This is needed when we add retimer access when there is no device connected but may be useful for other purposes too following what USB subsystem does. This exports a single attribute "link" that shows the type of the USB4 link (or "none" if there is no cable connected). Signed-off-by: Mika Westerberg Reviewed-by: Greg Kroah-Hartman

thunderbolt: Log the link as TBT instead of TBT3

2021-06-01T07:53:31+00:00

The upstream port can be connected to any previous generation Thunderbolt port so logging as "TBT" is more accurate than "TBT3. No functional changes. Signed-off-by: Mika Westerberg Reviewed-by: Greg Kroah-Hartman

thunderbolt: Read router preferred credit allocation information

2021-06-01T07:48:59+00:00

USB4 routers must expose their preferred credit (buffer) allocation information through router operation. This information tells the connection manager how the router prefers its buffers to be allocated to get the expected bandwidth for the supported protocols. Read this information and store it as part of struct tb_switch for each USB4 router. Signed-off-by: Mika Westerberg

thunderbolt: Align USB4 router wakes configuration with the CM guide

2021-05-31T11:40:08+00:00

The USB4 Configuration Manager guide suggests that the USB4 port wakes are configured in a certain way, like that when the port is configured the wake-on-connect should not be set and so forth, so align the driver with this. Signed-off-by: Mika Westerberg

thunderbolt: Add wake from DisplayPort

2021-05-31T11:39:52+00:00

Latest USB4 spec added a new wake bit for DisplayPort so add this to the driver when runtime suspending. This way wake up the domain when a new monitor is plugged in to any of the device routers. Also do the same for pre-USB4 devices through the link controller registers as documented in chapter 13 of the USB4 spec. Signed-off-by: Mika Westerberg