diff options
Diffstat (limited to 'recipes/kexecboot/linux-kexecboot-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch')
| -rw-r--r-- | recipes/kexecboot/linux-kexecboot-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/recipes/kexecboot/linux-kexecboot-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch b/recipes/kexecboot/linux-kexecboot-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch new file mode 100644 index 0000000000..a7898d1440 --- /dev/null +++ b/recipes/kexecboot/linux-kexecboot-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch @@ -0,0 +1,43 @@ +From a9199e8ab6d6fb105aa251d6bf2192e7eafac8ee Mon Sep 17 00:00:00 2001 +From: Ajay Kumar Gupta <ajay.gupta-l0cyMroinI0@public.gmane.org> +Date: Tue, 24 Mar 2009 17:22:53 -0700 +Subject: [PATCH] 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-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org: tweak patch description ] + +Signed-off-by: Ajay Kumar Gupta <ajay.gupta-l0cyMroinI0@public.gmane.org> +Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +Signed-off-by: Greg Kroah-Hartman <gregkh-l3A5Bk7waGM@public.gmane.org> +--- + drivers/usb/musb/musb_core.c | 2 +- + 1 files changed, 1 insertions(+), 1 deletions(-) + +diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c +index af77e46..338cd16 100644 +--- a/drivers/usb/musb/musb_core.c ++++ b/drivers/usb/musb/musb_core.c +@@ -769,7 +769,7 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, + case OTG_STATE_A_SUSPEND: + usb_hcd_resume_root_hub(musb_to_hcd(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 + + msecs_to_jiffies(musb->a_wait_bcon)); + break; +-- +1.6.0.4 + |