Commit 74382171 authored by Ajay Kumar Gupta's avatar Ajay Kumar Gupta Committed by Greg Kroah-Hartman

USB: musb: only turn off vbus in OTG hosts

Except on DaVinci, VBUS is now switched off as part of idling the
USB link (after a_wait_bcon) whenever a device is disconnected
from host.  This is correct for OTG hosts, where either SRP or
an ID interrupt could turn VBUS on again.

However, for non-OTG hosts there's no way to turn VBUS on again,
so the host becomes unusable.  And the procfs entry which once
allowed a manual workaround for this is now gone.

This patch adds an is_otg_enabled() check before scheduling the
switch-off timer in disconnect path, supporting a "classic host"
mode where SRP is unavailable.

[ dbrownell@users.sourceforge.net: tweak patch description ]
Signed-off-by: default avatarAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 32233716
...@@ -769,7 +769,7 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, ...@@ -769,7 +769,7 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
case OTG_STATE_A_SUSPEND: case OTG_STATE_A_SUSPEND:
usb_hcd_resume_root_hub(musb_to_hcd(musb)); usb_hcd_resume_root_hub(musb_to_hcd(musb));
musb_root_disconnect(musb); musb_root_disconnect(musb);
if (musb->a_wait_bcon != 0) if (musb->a_wait_bcon != 0 && is_otg_enabled(musb))
musb_platform_try_idle(musb, jiffies musb_platform_try_idle(musb, jiffies
+ msecs_to_jiffies(musb->a_wait_bcon)); + msecs_to_jiffies(musb->a_wait_bcon));
break; break;
......
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