[PATCH v6] usb: dwc3: fix gadget mode suspend interrupt handler issue

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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.

Remove link_state compare in dwc3_gadget_suspend_interrupt() and add a
suspended flag to replace the compare function.

Signed-off-by: Linyu Yuan <quic_linyyuan@xxxxxxxxxxx>
---
v6: (refer v5 https://lore.kernel.org/linux-usb/1682476780-2367-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/)
1) change subject
2) only keep suspended flag related change

v5: (refer v4 https://lore.kernel.org/linux-usb/1682393256-15572-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/)
1) rename suspend_irq_happen to suspended and document it
2) add old_link_state for link change interrupt usage and change accordingly

v4: (refer v3 https://lore.kernel.org/linux-usb/1682053861-21737-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/)
1) remove link state checking in dwc3_gadget_wakeup_interrupt()
2) remove two switch/case to if opeartion

v3: (refer v2 https://lore.kernel.org/linux-usb/1682042472-21222-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/)
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://lore.kernel.org/linux-usb/1675221286-23833-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/

 drivers/usb/dwc3/core.h   | 2 ++
 drivers/usb/dwc3/gadget.c | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d56457c02996..efacaacbbeb2 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1116,6 +1116,7 @@ struct dwc3_scratchpad_array {
  * @dis_metastability_quirk: set to disable metastability quirk.
  * @dis_split_quirk: set to disable split boundary.
  * @wakeup_configured: set if the device is configured for remote wakeup.
+ * @suspended: set if suspend irq happen to avoid possible consective suspend.
  * @imod_interval: set the interrupt moderation interval in 250ns
  *			increments or 0 to disable.
  * @max_cfg_eps: current max number of IN eps used across all USB configs.
@@ -1332,6 +1333,7 @@ struct dwc3 {
 	unsigned		dis_split_quirk:1;
 	unsigned		async_callbacks:1;
 	unsigned		wakeup_configured:1;
+	unsigned		suspended:1;
 
 	u16			imod_interval;
 
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c0ca4d12f95d..2c750534b405 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4303,8 +4303,10 @@ 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->suspended && next == DWC3_LINK_STATE_U3) {
+		dwc->suspended = true;
 		dwc3_suspend_gadget(dwc);
+	}
 
 	dwc->link_state = next;
 }
@@ -4312,6 +4314,9 @@ static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
 static void dwc3_gadget_interrupt(struct dwc3 *dwc,
 		const struct dwc3_event_devt *event)
 {
+	if  (event->type != DWC3_DEVICE_EVENT_SUSPEND)
+		dwc->suspended = false;
+
 	switch (event->type) {
 	case DWC3_DEVICE_EVENT_DISCONNECT:
 		dwc3_gadget_disconnect_interrupt(dwc);
-- 
2.17.1




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