usb: dwc3: fix gadget mode suspend interrupt handler issue

[ Upstream commit 4e8ef34e36f2839ef8c8da521ab7035956436818 ]

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.

Fixes: 799e9dc82968 ("usb: dwc3: gadget: conditionally disable Link State change events")
Cc: stable <stable@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/20230512004524.31950-1-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 725653711411d340d557de279896279f57c6f550..84cdac33cb3599e6c4f0c5542a612f13367e1a29 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1085,6 +1085,7 @@ struct dwc3_scratchpad_array {
  *     3       - Reserved
  * @dis_metastability_quirk: set to disable metastability quirk.
  * @dis_split_quirk: set to disable split boundary.
+ * @suspended: set to track suspend event due to U3/L2.
  * @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.
@@ -1298,6 +1299,7 @@ struct dwc3 {
 
        unsigned                dis_split_quirk:1;
        unsigned                async_callbacks:1;
+       unsigned                suspended:1;
 
        u16                     imod_interval;
 

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7ff77a0de5152465560d6a1d8284e7385031e001..e42d50e4aba307ada43d23df6d444e7be19d7ed1 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3694,6 +3694,8 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
 {
        int                     reg;
 
+       dwc->suspended = false;
+
        dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
 
        reg = dwc3_readl(dwc->regs, DWC3_DCTL);
@@ -3714,6 +3716,8 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
 {
        u32                     reg;
 
+       dwc->suspended = false;
+
        /*
         * Ideally, dwc3_reset_gadget() would trigger the function
         * drivers to stop any active transfers through ep disable.
@@ -3919,6 +3923,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 
 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
 {
+       dwc->suspended = false;
+
        /*
         * TODO take core out of low power mode when that's
         * implemented.
@@ -4034,8 +4040,10 @@ 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;
 }