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usb: dwc3: Add dual-role support

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If dr_mode is "otg" then support dual role mode of operation.
Currently this mode is only supported when an extcon handle is
present in the dwc3 device tree node. This is needed to
get the ID status events of the port.

We're using a workqueue to manage the dual-role state transitions
as the extcon notifier (dwc3_drd_notifier) is called in an atomic
context by extcon_sync() and this doesn't go well with
usb_del_gadget_udc() causing a lockdep and softirq warning.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros
2017-04-05 13:39:31 +03:00
committed by Felipe Balbi
parent 41ce1456e1
commit 9840354ff4
5 changed files with 111 additions and 4 deletions
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1
drivers/usb/dwc3/Kconfig
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@@ -41,6 +41,7 @@ config USB_DWC3_GADGET
config USB_DWC3_DUAL_ROLE
bool "Dual Role mode"
depends on ((USB=y || USB=USB_DWC3) && (USB_GADGET=y || USB_GADGET=USB_DWC3))
depends on (EXTCON=y || EXTCON=USB_DWC3)
help
This is the default mode of working of DWC3 controller where
both host and gadget features are enabled.