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musb: make initial HNP roleswitch work (v2) 

Minor HNP bugfixes, so the initial role switch works:

 - A-Device:
     * disconnect-during-suspend enters A_PERIPHERAL state
     * kill OTG timer after reset as A_PERIPHERAL ...
     * ... and also pass that reset to the gadget
     * once HNP succeeds, clear the "ignore_disconnect" flag
     * from A_PERIPHERAL, disconnect transitions to A_WAIT_BCON

 - B-Device:
     * kill OTG timer on entry to B_HOST state (HNP succeeded)
     * once HNP succeeds, clear "ignore_disconnect" flag
     * kick the root hub only _after_ the state is adjusted

Other state transitions are left alone.  Notably, exit paths from
the "roles have switched" state ... A_PERIPHERAL handling of that
stays seriously broken.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
David Brownell 2009-04-02 10:16:11 -07:00 committed by Greg Kroah-Hartman
parent f7f9d63eac
commit 1de00dae80
3 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/usb/musb/musb_core.c
View File

@ -587,28 +587,23 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
if (devctl & MUSB_DEVCTL_LSDEV)
musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
if (hcd->status_urb)
usb_hcd_poll_rh_status(hcd);
else
usb_hcd_resume_root_hub(hcd);
MUSB_HST_MODE(musb);
/* indicate new connection to OTG machine */
switch (musb->xceiv->state) {
case OTG_STATE_B_PERIPHERAL:
if (int_usb & MUSB_INTR_SUSPEND) {
DBG(1, "HNP: SUSPEND+CONNECT, now b_host\n");
musb->xceiv->state = OTG_STATE_B_HOST;
hcd->self.is_b_host = 1;
int_usb &= ~MUSB_INTR_SUSPEND;
goto b_host;
} else
DBG(1, "CONNECT as b_peripheral???\n");
break;
case OTG_STATE_B_WAIT_ACON:
DBG(1, "HNP: Waiting to switch to b_host state\n");
DBG(1, "HNP: CONNECT, now b_host\n");
b_host:
musb->xceiv->state = OTG_STATE_B_HOST;
hcd->self.is_b_host = 1;
musb->ignore_disconnect = 0;
del_timer(&musb->otg_timer);
break;
default:
if ((devctl & MUSB_DEVCTL_VBUS)
@ -618,6 +613,14 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
}
break;
}
/* poke the root hub */
MUSB_HST_MODE(musb);
if (hcd->status_urb)
usb_hcd_poll_rh_status(hcd);
else
usb_hcd_resume_root_hub(hcd);
DBG(1, "CONNECT (%s) devctl %02x\n",
otg_state_string(musb), devctl);
}
@ -662,7 +665,9 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
+ msecs_to_jiffies(TA_WAIT_BCON(musb)));
break;
case OTG_STATE_A_PERIPHERAL:
musb_hnp_stop(musb);
musb->ignore_disconnect = 0;
del_timer(&musb->otg_timer);
musb_g_reset(musb);
break;
case OTG_STATE_B_WAIT_ACON:
DBG(1, "HNP: RESET (%s), to b_peripheral\n",

2
drivers/usb/musb/musb_gadget.c
View File

@ -1964,7 +1964,7 @@ void musb_g_disconnect(struct musb *musb)
musb->xceiv->state = OTG_STATE_A_IDLE;
break;
case OTG_STATE_A_PERIPHERAL:
musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
break;
case OTG_STATE_B_WAIT_ACON:
case OTG_STATE_B_HOST:

11
drivers/usb/musb/musb_virthub.c
View File

@ -187,8 +187,17 @@ void musb_root_disconnect(struct musb *musb)
musb->is_active = 0;
switch (musb->xceiv->state) {
case OTG_STATE_A_HOST:
case OTG_STATE_A_SUSPEND:
#ifdef CONFIG_USB_MUSB_OTG
if (is_otg_enabled(musb)
&& musb->xceiv->host->b_hnp_enable) {
musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
musb->g.is_a_peripheral = 1;
break;
}
#endif
/* FALLTHROUGH */
case OTG_STATE_A_HOST:
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
musb->is_active = 0;
break;