diff options
Diffstat (limited to 'drivers/usb/musb/musb_virthub.c')
| -rw-r--r-- | drivers/usb/musb/musb_virthub.c | 65 |
1 files changed, 18 insertions, 47 deletions
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c index a523950c2b32..9af6bba5eac9 100644 --- a/drivers/usb/musb/musb_virthub.c +++ b/drivers/usb/musb/musb_virthub.c @@ -44,52 +44,6 @@ #include "musb_core.h" -/* -* Program the HDRC to start (enable interrupts, dma, etc.). -*/ -static void musb_start(struct musb *musb) -{ - void __iomem *regs = musb->mregs; - u8 devctl = musb_readb(regs, MUSB_DEVCTL); - - dev_dbg(musb->controller, "<== devctl %02x\n", devctl); - - /* Set INT enable registers, enable interrupts */ - musb->intrtxe = musb->epmask; - musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); - musb->intrrxe = musb->epmask & 0xfffe; - musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); - musb_writeb(regs, MUSB_INTRUSBE, 0xf7); - - musb_writeb(regs, MUSB_TESTMODE, 0); - - /* put into basic highspeed mode and start session */ - musb_writeb(regs, MUSB_POWER, MUSB_POWER_ISOUPDATE - | MUSB_POWER_HSENAB - /* ENSUSPEND wedges tusb */ - /* | MUSB_POWER_ENSUSPEND */ - ); - - musb->is_active = 0; - devctl = musb_readb(regs, MUSB_DEVCTL); - devctl &= ~MUSB_DEVCTL_SESSION; - - /* session started after: - * (a) ID-grounded irq, host mode; - * (b) vbus present/connect IRQ, peripheral mode; - * (c) peripheral initiates, using SRP - */ - if (musb->port_mode != MUSB_PORT_MODE_HOST && - (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) { - musb->is_active = 1; - } else { - devctl |= MUSB_DEVCTL_SESSION; - } - - musb_platform_enable(musb); - musb_writeb(regs, MUSB_DEVCTL, devctl); -} - static void musb_port_suspend(struct musb *musb, bool do_suspend) { struct usb_otg *otg = musb->xceiv->otg; @@ -266,6 +220,23 @@ int musb_hub_status_data(struct usb_hcd *hcd, char *buf) return retval; } +static int musb_has_gadget(struct musb *musb) +{ + /* + * In host-only mode we start a connection right away. In OTG mode + * we have to wait until we loaded a gadget. We don't really need a + * gadget if we operate as a host but we should not start a session + * as a device without a gadget or else we explode. + */ +#ifdef CONFIG_USB_MUSB_HOST + return 1; +#else + if (musb->port_mode == MUSB_PORT_MODE_HOST) + return 1; + return musb->g.dev.driver != NULL; +#endif +} + int musb_hub_control( struct usb_hcd *hcd, u16 typeReq, @@ -408,7 +379,7 @@ int musb_hub_control( * initialization logic, e.g. for OTG, or change any * logic relating to VBUS power-up. */ - if (!hcd->self.is_b_host) + if (!hcd->self.is_b_host && musb_has_gadget(musb)) musb_start(musb); break; case USB_PORT_FEAT_RESET: |