Hi, Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> writes: > The USB 3.2 specification adds support for Dual-lane, doubling the > maximum rate to 20Gbps by taking into use another set of rx and tx > wires and pins in the Type-C cable and connector. > > The changes to support this in USB core and xhci driver seems to be minor. > USB 3.1 support already added the extended port status request returning > lane count. it just wasn't used before. > > I'd like to use these patches to start a discussion about which items > regarding Dual-lane and USB 3.2 should be exposed to userspace and how. > > These patches add a variable "lanes" to store the number of lanes > in use, and adds the Gen XxY notion to the string displayed when a new > device is connected. X in Gen XxY stands for signaling rate, > Y for lane count, as described in the USB 3.2 specification. > > Example for clarification: > Gen 1x1 = 5Gbps, SuperSpeed, one lane, same as USB3.0, and USB 3.1 Gen1 > Gen 2x1 = 10Gbps, SuperSpeedPlus, one lane, same as USB 3.1 Gen2 > Gen 1x2 = 10Gbps, SuperSpeed, Dual-lane (2 x 5Gbps) > Gen 2x2 = 20Gbps, SuperSpeedPlus, Dual-lane (2 x 10Gbps) it's a little more interesting than that, no? IIRC, we can Gen 2x2 RX and Gen 2x1 TX (and vice-versa). -- balbi -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
