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authorMathias Nyman <mathias.nyman@linux.intel.com>2018-04-19 19:05:51 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-22 16:11:19 +0200
commit013eedb8c56e55549c45df19ca56a029cc804028 (patch)
treed0372e789faebaa0cb33f25f4d1b64528e631e00 /include/linux/usb.h
parentffe95371d2a84f3ad8085656d4fcb2fc926ff7a1 (diff)
USB: Add support to store lane count used by USB 3.2
USB 3.2 specification adds Dual-lane support, doubling the maximum SuperSpeedPlus data rate from 10Gbps to 20Gbps. Dual-lane takes into use a second set of rx and tx wires/pins in the Type-C cable and connector. Add "rx_lanes" and "tx_lanes" variables to struct usb_device to store the numer of lanes in use. Number of lanes can be read using the extended port status hub request that was introduced in USB 3.1. Extended port status rx and tx lane count are zero based, maximum lanes supported by non inter-chip (SSIC) USB 3.2 is 2 (dual lane) with rx and tx lane count symmetric. SSIC devices support asymmetric lanes up to 4 lanes per direction. If extended port status is not available then default to one lane. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb.h')
-rw-r--r--include/linux/usb.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 0173597e59aa..beffceec4915 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -551,6 +551,8 @@ struct usb3_lpm_parameters {
* @route: tree topology hex string for use with xHCI
* @state: device state: configured, not attached, etc.
* @speed: device speed: high/full/low (or error)
+ * @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support
+ * @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support
* @tt: Transaction Translator info; used with low/full speed dev, highspeed hub
* @ttport: device port on that tt hub
* @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints
@@ -624,6 +626,8 @@ struct usb_device {
u32 route;
enum usb_device_state state;
enum usb_device_speed speed;
+ unsigned int rx_lanes;
+ unsigned int tx_lanes;
struct usb_tt *tt;
int ttport;