[v4,0/2] Fix vbus draw of dwc3 gadget

Message

Prashanth K Feb. 24, 2023, 5:46 a.m. UTC

Changes in v4
 - Added corresponding BC1.2 spec section in commit text

Changes in v3
 - Fixed minor syntax error and warnings

Changes in v2
 - Added min() calculation against CONFIG_USB_GADGET_VBUS_DRAW in case
  of unconfigured state.

Currently dwc3 gadget processes the suspend interrupt event only
if the device is in configured state. But consider a case where
device is not configured and got suspend interrupt, in that case
our gadget would still use 100mA as composite_suspend didn't happen.
But battery charging specification (BC1.2) expects a downstream
device to draw less than 2.5mA when unconnected OR suspended.

And while resuming, the gadget can draw upto 100mA if its not
configured, but the current implementation of composite_resume
doesn't consider the case of unconfigured device. This series
addresses the above mentioned issues.

Prashanth K (2):
  usb: dwc3: gadget: Change condition for processing suspend event
  usb: gadget: composite: Draw 100mA current if not configured

Prashanth K (2):
  usb: dwc3: gadget: Change condition for processing suspend event
  usb: gadget: composite: Draw 100mA current if not configured

 drivers/usb/dwc3/gadget.c      | 11 ++---------
 drivers/usb/gadget/composite.c |  4 ++++
 2 files changed, 6 insertions(+), 9 deletions(-)