On 4/26/2023 8:41 AM, Thinh Nguyen wrote:
On Tue, Apr 25, 2023, Linyu Yuan wrote:
When work in gadget mode, currently driver doesn't update software level
link_state correctly as link state change event is not enabled for most
devices, in function dwc3_gadget_suspend_interrupt(), it will only pass
suspend event to UDC core when software level link state changes, so when
interrupt generated in sequences of suspend -> reset -> conndone ->
suspend, link state is not updated during reset and conndone, so second
suspend interrupt event will not pass to UDC core.
As in gadget mode, device level interrupt event have link state
information, let's trust it and update software level link state to it
when process each device level interrupt.
Signed-off-by: Linyu Yuan <quic_linyyuan@xxxxxxxxxxx>
---
v4: (refer v3 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682053861-21737-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!a12WTwnynMWevTe8tSyxx3MoF0XhKz9k38CjFuYKOc2vD19DEMloyUsVztwSyMqoNepUxoxv6DvVIqK777AtShabXLCHgg$ )
1) remove link state checking in dwc3_gadget_wakeup_interrupt()
2) remove two switch/case to if opeartion
v3: (refer v2 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682042472-21222-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!a12WTwnynMWevTe8tSyxx3MoF0XhKz9k38CjFuYKOc2vD19DEMloyUsVztwSyMqoNepUxoxv6DvVIqK777AtShZcfcckDg$ )
no code change since v2, changes compare v1 as below,
1) add a flag suspend_irq_happen to simplify dwc3_gadget_suspend_interrupt(),
it will avoid refer to software level link_state, finally link_state will
only used in dwc3_gadget_linksts_change_interrupt().
2) remove sw setting of link_state in dwc3_gadget_func_wakeup()
3) add dwc3_gadget_interrupt_early() to correct setting of link_state
and suspend_irq_happen.
v2: update according v1 discussion
v1: https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1675221286-23833-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!a12WTwnynMWevTe8tSyxx3MoF0XhKz9k38CjFuYKOc2vD19DEMloyUsVztwSyMqoNepUxoxv6DvVIqK777AtShY6L1v3RA$
drivers/usb/dwc3/core.h | 1 +
drivers/usb/dwc3/gadget.c | 30 ++++++++++++++++++------------
2 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d56457c..8622f9c 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1332,6 +1332,7 @@ struct dwc3 {
unsigned dis_split_quirk:1;
unsigned async_callbacks:1;
unsigned wakeup_configured:1;
+ unsigned suspend_irq_happen:1;
will change to suspended and document it.
Still not documenting this... Why?
u16 imod_interval;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c0ca4d1..9dc64a4 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2440,7 +2440,6 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
return -EINVAL;
}
dwc3_resume_gadget(dwc);
- dwc->link_state = DWC3_LINK_STATE_U0;
}
ret = dwc3_send_gadget_generic_command(dwc, DWC3_DGCMD_DEV_NOTIFICATION,
@@ -4178,7 +4177,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
*/
}
-static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
+static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
{
/*
* TODO take core out of low power mode when that's
@@ -4190,8 +4189,6 @@ static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
dwc->gadget_driver->resume(dwc->gadget);
spin_lock(&dwc->lock);
}
-
- dwc->link_state = evtinfo & DWC3_LINK_STATE_MASK;
}
static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
@@ -4298,20 +4295,29 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
dwc->link_state = next;
}
-static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
- unsigned int evtinfo)
+static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc)
{
- enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
-
- if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
+ if (!dwc->suspend_irq_happen) {
+ dwc->suspend_irq_happen = true;
dwc3_suspend_gadget(dwc);
+ }
+}
- dwc->link_state = next;
+static inline void dwc3_gadget_interrupt_early(struct dwc3 *dwc,
+ const struct dwc3_event_devt *event)
+{
+ if (event->type != DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE)
+ dwc->link_state = event->event_info & DWC3_LINK_STATE_MASK;
+
+ if (event->type != DWC3_DEVICE_EVENT_SUSPEND)
+ dwc->suspend_irq_happen = false;
}
static void dwc3_gadget_interrupt(struct dwc3 *dwc,
const struct dwc3_event_devt *event)
{
+ dwc3_gadget_interrupt_early(dwc, event);
+
This may cause regression for the quirk for dwc_usb3 v2.50a and
previous as noted earlier. Why are you still doing it like this?
do you have concern of below code ?
static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
unsigned int evtinfo)
...
pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
if (DWC3_VER_IS_PRIOR(DWC3, 250A) &&
(pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
(next == DWC3_LINK_STATE_RESUME)) {
return;
}
}
seem when DWC3_LINK_STATE_RESUME happen, it didn't update old link state.
do we need to add one new variable like old_link_state ?
then let's keep the idea that link_state represent state in each device
level interrupt.
BR,
Thinh
switch (event->type) {
case DWC3_DEVICE_EVENT_DISCONNECT:
dwc3_gadget_disconnect_interrupt(dwc);
@@ -4323,7 +4329,7 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc,
dwc3_gadget_conndone_interrupt(dwc);
break;
case DWC3_DEVICE_EVENT_WAKEUP:
- dwc3_gadget_wakeup_interrupt(dwc, event->event_info);
+ dwc3_gadget_wakeup_interrupt(dwc);
break;
case DWC3_DEVICE_EVENT_HIBER_REQ:
dev_WARN_ONCE(dwc->dev, true, "unexpected hibernation event\n");
@@ -4334,7 +4340,7 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc,
case DWC3_DEVICE_EVENT_SUSPEND:
/* It changed to be suspend event for version 2.30a and above */
if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
- dwc3_gadget_suspend_interrupt(dwc, event->event_info);
+ dwc3_gadget_suspend_interrupt(dwc);
break;
case DWC3_DEVICE_EVENT_SOF:
case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
--
2.7.4
