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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-03-31 12:35:09 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:41 -0700
commitab983f2a1be582b00f706013f40f658769d0823a (patch)
tree95dce5821b73726351f323d2d1bd4a80bea9ceb3 /drivers/usb/musb
parent1de00dae8036dfee44ebea2c38f942fb6072e0b7 (diff)
musb: support disconnect after HNP roleswitch
Adjust HNP state machines in MUSB driver so that they handle the case where the cable is disconnected. The A-side machine was very wrong (unrecoverable); the B-Side was much less so. - A_PERIPHERAL ... as usual, the non-observability of the ID pin through Mentor's registers makes trouble. We can't go directly to A_WAIT_VFALL to end the session and start the disconnect processing. We can however sense link suspending, go to A_WAIT_BCON, and from there use OTG timeouts to finally trigger that A_WAIT_VFALL transition. (Hoping that nobody reconnects quickly to that port and notices the wrong state.) - B_HOST ... actually clear the Host Request (HR) bit as the messages say, disconnect the peripheral from the root hub, and don't detour through a suspend state. (In some cases this would eventually have cleaned up.) Also adjust the A_SUSPEND transition to respect the A_AIDL_BDIS timeout, so if HNP doesn't trigger quickly enough the A_WAIT_VFALL transition happens as it should. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb')
-rw-r--r--drivers/usb/musb/musb_core.c41
-rw-r--r--drivers/usb/musb/musb_gadget.c2
-rw-r--r--drivers/usb/musb/musb_virthub.c4
3 files changed, 35 insertions, 12 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 93dd23a7eb6..b49859623f8 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -304,9 +304,11 @@ void musb_otg_timer_func(unsigned long data)
musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
musb->is_active = 0;
break;
+ case OTG_STATE_A_SUSPEND:
case OTG_STATE_A_WAIT_BCON:
- DBG(1, "HNP: a_wait_bcon timeout; back to a_host\n");
- musb_hnp_stop(musb);
+ DBG(1, "HNP: %s timeout\n", otg_state_string(musb));
+ musb_set_vbus(musb, 0);
+ musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
break;
default:
DBG(1, "HNP: Unhandled mode %s\n", otg_state_string(musb));
@@ -324,15 +326,12 @@ void musb_hnp_stop(struct musb *musb)
void __iomem *mbase = musb->mregs;
u8 reg;
+ DBG(1, "HNP: stop from %s\n", otg_state_string(musb));
+
switch (musb->xceiv->state) {
case OTG_STATE_A_PERIPHERAL:
- case OTG_STATE_A_WAIT_VFALL:
- case OTG_STATE_A_WAIT_BCON:
- DBG(1, "HNP: Switching back to A-host\n");
musb_g_disconnect(musb);
- musb->xceiv->state = OTG_STATE_A_IDLE;
- MUSB_HST_MODE(musb);
- musb->is_active = 0;
+ DBG(1, "HNP: back to %s\n", otg_state_string(musb));
break;
case OTG_STATE_B_HOST:
DBG(1, "HNP: Disabling HR\n");
@@ -775,7 +774,16 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
#endif /* HOST */
#ifdef CONFIG_USB_MUSB_OTG
case OTG_STATE_B_HOST:
- musb_hnp_stop(musb);
+ /* REVISIT this behaves for "real disconnect"
+ * cases; make sure the other transitions from
+ * from B_HOST act right too. The B_HOST code
+ * in hnp_stop() is currently not used...
+ */
+ musb_root_disconnect(musb);
+ musb_to_hcd(musb)->self.is_b_host = 0;
+ musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
+ MUSB_DEV_MODE(musb);
+ musb_g_disconnect(musb);
break;
case OTG_STATE_A_PERIPHERAL:
musb_hnp_stop(musb);
@@ -807,10 +815,19 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
switch (musb->xceiv->state) {
#ifdef CONFIG_USB_MUSB_OTG
case OTG_STATE_A_PERIPHERAL:
- /*
- * We cannot stop HNP here, devctl BDEVICE might be
- * still set.
+ /* We also come here if the cable is removed, since
+ * this silicon doesn't report ID-no-longer-grounded.
+ *
+ * We depend on T(a_wait_bcon) to shut us down, and
+ * hope users don't do anything dicey during this
+ * undesired detour through A_WAIT_BCON.
*/
+ musb_hnp_stop(musb);
+ usb_hcd_resume_root_hub(musb_to_hcd(musb));
+ musb_root_disconnect(musb);
+ musb_platform_try_idle(musb, jiffies
+ + msecs_to_jiffies(musb->a_wait_bcon
+ ? : OTG_TIME_A_WAIT_BCON));
break;
#endif
case OTG_STATE_B_PERIPHERAL:
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 3c4da75fbc7..858d005fae6 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1962,9 +1962,11 @@ void musb_g_disconnect(struct musb *musb)
DBG(2, "Unhandled disconnect %s, setting a_idle\n",
otg_state_string(musb));
musb->xceiv->state = OTG_STATE_A_IDLE;
+ MUSB_HST_MODE(musb);
break;
case OTG_STATE_A_PERIPHERAL:
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
+ MUSB_HST_MODE(musb);
break;
case OTG_STATE_B_WAIT_ACON:
case OTG_STATE_B_HOST:
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index c85a82a41d5..bfe5fe4ebfe 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -83,6 +83,10 @@ static void musb_port_suspend(struct musb *musb, bool do_suspend)
musb->xceiv->state = OTG_STATE_A_SUSPEND;
musb->is_active = is_otg_enabled(musb)
&& musb->xceiv->host->b_hnp_enable;
+ if (musb->is_active)
+ mod_timer(&musb->otg_timer, jiffies
+ + msecs_to_jiffies(
+ OTG_TIME_A_AIDL_BDIS));
musb_platform_try_idle(musb, 0);
break;
#ifdef CONFIG_USB_MUSB_OTG