diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch')
-rw-r--r-- | meta/recipes-kernel/linux/linux-omap-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/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch b/meta/recipes-kernel/linux/linux-omap-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/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0001-USB-musb-only-turn-off-vbus-in-OTG-hosts.patch | |||
@@ -0,0 +1,43 @@ | |||
1 | From a9199e8ab6d6fb105aa251d6bf2192e7eafac8ee Mon Sep 17 00:00:00 2001 | ||
2 | From: Ajay Kumar Gupta <ajay.gupta-l0cyMroinI0@public.gmane.org> | ||
3 | Date: Tue, 24 Mar 2009 17:22:53 -0700 | ||
4 | Subject: [PATCH] USB: musb: only turn off vbus in OTG hosts | ||
5 | |||
6 | Except on DaVinci, VBUS is now switched off as part of idling the | ||
7 | USB link (after a_wait_bcon) whenever a device is disconnected | ||
8 | from host. This is correct for OTG hosts, where either SRP or | ||
9 | an ID interrupt could turn VBUS on again. | ||
10 | |||
11 | However, for non-OTG hosts there's no way to turn VBUS on again, | ||
12 | so the host becomes unusable. And the procfs entry which once | ||
13 | allowed a manual workaround for this is now gone. | ||
14 | |||
15 | This patch adds an is_otg_enabled() check before scheduling the | ||
16 | switch-off timer in disconnect path, supporting a "classic host" | ||
17 | mode where SRP is unavailable. | ||
18 | |||
19 | [ dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org: tweak patch description ] | ||
20 | |||
21 | Signed-off-by: Ajay Kumar Gupta <ajay.gupta-l0cyMroinI0@public.gmane.org> | ||
22 | Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> | ||
23 | Signed-off-by: Greg Kroah-Hartman <gregkh-l3A5Bk7waGM@public.gmane.org> | ||
24 | --- | ||
25 | drivers/usb/musb/musb_core.c | 2 +- | ||
26 | 1 files changed, 1 insertions(+), 1 deletions(-) | ||
27 | |||
28 | diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c | ||
29 | index af77e46..338cd16 100644 | ||
30 | --- a/drivers/usb/musb/musb_core.c | ||
31 | +++ b/drivers/usb/musb/musb_core.c | ||
32 | @@ -769,7 +769,7 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb, | ||
33 | case OTG_STATE_A_SUSPEND: | ||
34 | usb_hcd_resume_root_hub(musb_to_hcd(musb)); | ||
35 | musb_root_disconnect(musb); | ||
36 | - if (musb->a_wait_bcon != 0) | ||
37 | + if (musb->a_wait_bcon != 0 && is_otg_enabled(musb)) | ||
38 | musb_platform_try_idle(musb, jiffies | ||
39 | + msecs_to_jiffies(musb->a_wait_bcon)); | ||
40 | break; | ||
41 | -- | ||
42 | 1.6.0.4 | ||
43 | |||