[PATCH 4.4 42/58] usb: chipidea: core: add wakeup support for extcon

From: Greg Kroah-Hartman
Date: Mon Jul 20 2020 - 11:39:46 EST


From: Peter Chen <peter.chen@xxxxxxx>

commit 876d4e1e8298ad1f94d9e9392fc90486755437b4 upstream.

If wakeup event occurred by extcon event, it needs to call
ci_irq again since the first ci_irq calling at extcon notifier
only wakes up controller, but do noop for event handling,
it causes the extcon use case can't work well from low power mode.

Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 3ecb3e09b042 ("usb: chipidea: Use extcon framework for VBUS and ID detect")
Reported-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
Tested-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Link: https://lore.kernel.org/r/20200707060601.31907-2-peter.chen@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/chipidea/core.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -1122,6 +1122,29 @@ static void ci_controller_suspend(struct
enable_irq(ci->irq);
}

+/*
+ * Handle the wakeup interrupt triggered by extcon connector
+ * We need to call ci_irq again for extcon since the first
+ * interrupt (wakeup int) only let the controller be out of
+ * low power mode, but not handle any interrupts.
+ */
+static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
+{
+ struct ci_hdrc_cable *cable_id, *cable_vbus;
+ u32 otgsc = hw_read_otgsc(ci, ~0);
+
+ cable_id = &ci->platdata->id_extcon;
+ cable_vbus = &ci->platdata->vbus_extcon;
+
+ if (!IS_ERR(cable_id->edev) && ci->is_otg &&
+ (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
+ ci_irq(ci->irq, ci);
+
+ if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
+ (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
+ ci_irq(ci->irq, ci);
+}
+
static int ci_controller_resume(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
@@ -1148,6 +1171,7 @@ static int ci_controller_resume(struct d
enable_irq(ci->irq);
if (ci_otg_is_fsm_mode(ci))
ci_otg_fsm_wakeup_by_srp(ci);
+ ci_extcon_wakeup_int(ci);
}

return 0;