From 9835a6ef1a96b203278629bbcf5099622070c32b Mon Sep 17 00:00:00 2001 From: Robert Jarzmik Date: Fri, 8 Jul 2016 22:09:06 +0200 Subject: [PATCH] usb: phy: generic: cope with initial state In the gpio based case, the status of the phy is known at start by reading the VBus gpio. Actually, this is a fix, as this initial state, when not set up, prevents a gadget to answer to the enumeration phase, as there is no notification in this case (the VBus is already high when kernel boots) so no interrupt is triggered, and the flow is : - gadget initializes - gadget gets its phy-generic with a xxx_get_phy_xxx() call type - gadget does a "set_peripheral()" call type => here if the otg->state is correctly filled, the proper vbus handling will be called, and the gadget will be aware it should answer enumeration and go forth Without this fix, the USB cable must be removed and replugged for any gadget relying on phy-generic and its gpio vbus handling to work. The problem was seen on a pxa27x architecture based board on a devicetree build. Signed-off-by: Robert Jarzmik Signed-off-by: Felipe Balbi --- drivers/usb/phy/phy-generic.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c index 980c9dee09eb..41b8aff9b925 100644 --- a/drivers/usb/phy/phy-generic.c +++ b/drivers/usb/phy/phy-generic.c @@ -322,6 +322,8 @@ static int usb_phy_generic_probe(struct platform_device *pdev) gpiod_to_irq(nop->gpiod_vbus), err); return err; } + nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ? + OTG_STATE_B_PERIPHERAL : OTG_STATE_B_IDLE; } nop->phy.init = usb_gen_phy_init; -- 2.20.1