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usb: gadget: dwc2_udc_otg: implement pullup()

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Pullup is used by the usb framework in order to do software-controlled
usb_gadget_connect() and usb_gadget_disconnect().

Implement pullup() for dwc2 using the SOFT_DISCONNECT bit in the dctl
register:
* when pullup is on, clear SOFT_DISCONNECT
* when pullup is off, set SOFT_DISCONNECT

This is especially useful when a gadget disconnection is initiated but
no board_usb_cleanup() is called.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
This commit is contained in:
Mattijs Korpershoek 2023-01-11 09:19:27 +01:00 committed by Marek Vasut
parent 66b5847b30
commit 2383e8f4ae
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/gadget/dwc2_udc_otg.c
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@ -236,6 +236,14 @@ static int udc_enable(struct dwc2_udc *dev)
return 0;
}
static int dwc2_gadget_pullup(struct usb_gadget *g, int is_on)
{
clrsetbits_le32(&reg->dctl, SOFT_DISCONNECT,
is_on ? 0 : SOFT_DISCONNECT);
return 0;
}
#if !CONFIG_IS_ENABLED(DM_USB_GADGET)
/*
Register entry point for the peripheral controller driver.
@ -805,6 +813,7 @@ static void dwc2_fifo_flush(struct usb_ep *_ep)
}
static const struct usb_gadget_ops dwc2_udc_ops = {
.pullup = dwc2_gadget_pullup,
/* current versions must always be self-powered */
#if CONFIG_IS_ENABLED(DM_USB_GADGET)
.udc_start = dwc2_gadget_start,