This is a note to let you know that I've just added the patch titled
usb: phy: twl4030-usb: Fix lost interrupts after ID pin goes down
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-phy-twl4030-usb-fix-lost-interrupts-after-id-pin-goes-down.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85601b8d81e24ce9ae2d31e93f35468ab7616b18 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@xxxxxxxxxxx>
Date: Sun, 24 Aug 2014 17:44:22 +0530
Subject: usb: phy: twl4030-usb: Fix lost interrupts after ID pin goes down
From: Tony Lindgren <tony@xxxxxxxxxxx>
commit 85601b8d81e24ce9ae2d31e93f35468ab7616b18 upstream.
Commit 249751f22380 ("usb: phy: twl4030-usb: poll for ID disconnect")
added twl4030_id_workaround_work() to deal with lost interrupts
after ID pin goes down. Looks like commit f1ddc24c9e33 ("usb: phy:
twl4030-usb: remove *set_suspend* and *phy_init* ops") changed
things around for the generic phy framework, and delayed work no
longer got called except initially during boot.
The PHY connect and disconnect interrupts for twl4030-usb are not
working after disconnecting a USB-A cable from the board, and the
deeper idle states for omap are blocked as the USB controller
stays busy.
The issue can be solved by calling delayed work from twl4030_usb_irq()
when ID pin is down and the PHY is not asleep like we already do
in twl4030_id_workaround_work().
But as both twl4030_usb_irq() and twl4030_id_workaround_work()
already do pretty much the same thing, let's call twl4030_usb_irq()
from twl4030_id_workaround_work() instead of adding some more
duplicate code. We also must call sysfs_notify() only when we have
an interrupt and not from the delayed work as notified by
Grazvydas Ignotas <notasas@xxxxxxxxx>.
Fixes: f1ddc24c9e33 ("usb: phy: twl4030-usb: remove *set_suspend* and *phy_init* ops")
Acked-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/phy/phy-twl4030-usb.c | 33 ++++++++++-----------------------
1 file changed, 10 insertions(+), 23 deletions(-)
--- a/drivers/phy/phy-twl4030-usb.c
+++ b/drivers/phy/phy-twl4030-usb.c
@@ -560,7 +560,15 @@ static irqreturn_t twl4030_usb_irq(int i
*/
omap_musb_mailbox(status);
}
- sysfs_notify(&twl->dev->kobj, NULL, "vbus");
+
+ /* don't schedule during sleep - irq works right then */
+ if (status == OMAP_MUSB_ID_GROUND && !twl->asleep) {
+ cancel_delayed_work(&twl->id_workaround_work);
+ schedule_delayed_work(&twl->id_workaround_work, HZ);
+ }
+
+ if (irq)
+ sysfs_notify(&twl->dev->kobj, NULL, "vbus");
return IRQ_HANDLED;
}
@@ -569,29 +577,8 @@ static void twl4030_id_workaround_work(s
{
struct twl4030_usb *twl = container_of(work, struct twl4030_usb,
id_workaround_work.work);
- enum omap_musb_vbus_id_status status;
- bool status_changed = false;
-
- status = twl4030_usb_linkstat(twl);
-
- spin_lock_irq(&twl->lock);
- if (status >= 0 && status != twl->linkstat) {
- twl->linkstat = status;
- status_changed = true;
- }
- spin_unlock_irq(&twl->lock);
- if (status_changed) {
- dev_dbg(twl->dev, "handle missing status change to %d\n",
- status);
- omap_musb_mailbox(status);
- }
-
- /* don't schedule during sleep - irq works right then */
- if (status == OMAP_MUSB_ID_GROUND && !twl->asleep) {
- cancel_delayed_work(&twl->id_workaround_work);
- schedule_delayed_work(&twl->id_workaround_work, HZ);
- }
+ twl4030_usb_irq(0, twl);
}
static int twl4030_phy_init(struct phy *phy)
Patches currently in stable-queue which might be from tony@xxxxxxxxxxx are
queue-3.16/usb-phy-twl4030-usb-fix-lost-interrupts-after-id-pin-goes-down.patch
queue-3.16/usb-phy-twl4030-usb-fix-regressions-to-runtime-pm-on-omaps.patch
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