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usb: dwc3: core: support type-c data role swap dynamically

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This patch supports fusb302 to do data role swap for
Type-C Dongle with PD adapter.

The test case is:

 - Use a Type-C Dongle (PD adapter & USB & HDMI)
 - Plug a PD adapter into Type-C Dongle first, then
   connect the Dongle with RK3399 Type-C0 port.
 - Check if Type-C Dongle can fetch 5V with the following log:
   "fusb302 4-0022: PD connected as UFP, fetching 5V"
 - Wait for the data role swap completion (hundreds of
   milliseconds), then check if the Type-C USB can work
   in DFP mode.

Without this patch, the DWC3 can't switch to DFP mode
after the data role swap completion. It's because that
when the fusb302 do data role swap, it only sends extcon
notifier with EXTCON_USB true or EXTCON_USB_HOST true.
Generally, the sequence of the extcon notifier sent from
fusb302 is:

- send "EXTCON_USB = true" and "EXTCON_USB_HOST=false"
  to DWC3 driver, then DWC3 switch to UFP, and set the
  connected flag to true.

- After swap completion, send "EXTCON_USB = false" and
  "EXTCON_USB_HOST = true" to DWC3 driver. Because the
  connected flag is true, the DWC3 is unable to switch
  to DFP mode.

This patch forces DWC3 to do disconnection if it detects
the connected flag is true and the DWC3 mode is UFP.

This patch can also fix a bug if we use command to force
DWC3 mode to DFP (host mode) when the DWC3 is working on
UFP mode and connecting to USB Host.

Change-Id: I5b3a17957ef720eb90664186033ef91269ecbc38
Signed-off-by: William Wu <william.wu@rock-chips.com>
This commit is contained in:
William Wu
2020-03-12 17:28:14 +08:00
committed by Tao Huang
parent a3dbb3d1ce
commit 7df2653064
1 changed files with 15 additions and 2 deletions
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17
drivers/usb/dwc3/core.c
View File

@@ -199,8 +199,20 @@ static void __dwc3_set_mode(struct work_struct *work)
runtime:
if (extcon_get_state(dwc->edev, EXTCON_USB) ||
extcon_get_state(dwc->edev, EXTCON_USB_HOST)) {
if (dwc->drd_connected)
return;
if (dwc->drd_connected) {
/*
* If the connected flag is true, and the DWC3 is
* in device mode, it means that the Type-C cable
* is doing data role swap (UFP -> DFP), so we need
* to disconnect UFP first, and then switch DWC3 to
* DFP depends on the next extcon notifier.
*/
if (extcon_get_state(dwc->edev, EXTCON_USB_HOST) &&
dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
goto disconnect;
else
return;
}
dwc->current_dr_role = dwc->desired_dr_role;
pm_runtime_get_sync(dwc->dev);
@@ -247,6 +259,7 @@ runtime:
break;
}
} else {
disconnect:
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_HOST:
phy_power_off(dwc->usb3_generic_phy);