[v2,00/12] usb: Handle different sublink speeds

Message

Thinh Nguyen July 23, 2020, 2:12 a.m. UTC

A USB super-speed-plus device may operate at different sublink speed and lane
count (e.g. gen2x2, gen1x2, or gen2x1). The usb gadget stack needs to be able
to handle a couple things:

1) Report the sublink speed attributes the device support
2) Select the sublink speed attribute

This series introduces sublink speed attribute structure to ch9.h to capture
the device capability of the gadget. It also introduces a new gadget ops
udc_set_num_lanes_and_speed to select a specific sublink speed.

DWC3 needs this support for DWC_usb32 IP. Implement the new changes for DWC3.

Changes in v2:
 - Move usb_sublink_speed attribute struct and enum to include/linux/usb/ch9.h
 - Use "num-lanes" and "lane-speed-mantissa-gbps" as common properties instead
 - Add common functions to get num-lanes and lsm properties
 - Fix missing gen1x2 sublink speed attribute check report in dwc3


Thinh Nguyen (12):
  usb: ch9: Add sublink speed struct
  usb: gadget: composite: Avoid using magic numbers
  usb: gadget: Expose sublink speed attributes
  usb: gadget: Set max speed for SSP devices
  usb: composite: Properly report sublink speed
  usb: devicetree: Introduce num-lanes and lsm
  usb: common: Add functions to get lanes and lsm
  usb: dwc3: Initialize lane count and sublink speed
  usb: dwc3: gadget: Report sublink speed capability
  usb: dwc3: gadget: Implement setting of sublink speed
  usb: dwc3: gadget: Track connected lane and sublink speed
  usb: dwc3: gadget: Set speed only up to the max supported

 Documentation/devicetree/bindings/usb/generic.txt |  11 ++
 drivers/usb/common/common.c                       |  26 ++++
 drivers/usb/dwc3/core.c                           |  62 ++++++++++
 drivers/usb/dwc3/core.h                           |  18 +++
 drivers/usb/dwc3/gadget.c                         | 143 +++++++++++++++++++++-
 drivers/usb/gadget/composite.c                    |  81 ++++++++----
 drivers/usb/gadget/udc/core.c                     |  24 +++-
 include/linux/usb/ch9.h                           |  62 ++++++++++
 include/linux/usb/gadget.h                        |  23 ++++
 9 files changed, 414 insertions(+), 36 deletions(-)


base-commit: 5db5ea26a2469d8899f995e82e8b718dc9e9d168