diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2018-04-19 19:05:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-22 17:11:19 +0300 |
| commit | 013eedb8c56e55549c45df19ca56a029cc804028 (patch) | |
| tree | d0372e789faebaa0cb33f25f4d1b64528e631e00 /drivers/usb/core | |
| parent | ffe95371d2a84f3ad8085656d4fcb2fc926ff7a1 (diff) | |
| download | linux-013eedb8c56e55549c45df19ca56a029cc804028.tar.xz | |
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 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 9e79bcf03cde..e21cc3be18b7 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2746,6 +2746,14 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1, if (!udev) return 0; + if (hub_is_superspeedplus(hub->hdev)) { + /* extended portstatus Rx and Tx lane count are zero based */ + udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; + udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; + } else { + udev->rx_lanes = 1; + udev->tx_lanes = 1; + } if (hub_is_wusb(hub)) udev->speed = USB_SPEED_WIRELESS; else if (hub_is_superspeedplus(hub->hdev) && |