usb: dwc3: gadget: Enable suspend events

commit 72704f876f50 ("dwc3: gadget: Implement the suspend entry event
handler") introduced (nearly 5 years ago!) an interrupt handler for
U3/L1-L2 suspend events.  The problem is that these events aren't
currently enabled in the DEVTEN register so the handler is never
even invoked.  Fix this simply by enabling the corresponding bit
in dwc3_gadget_enable_irq() using the same revision check as found
in the handler.

Fixes: 72704f876f50 ("dwc3: gadget: Implement the suspend entry event handler")
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210428090111.3370-1-jackp@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index dd80e5ca8c78b6e402864a00b8e314a7a09e175f..cab3a9184068904041669e48ee9e1d78003456e2 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2323,6 +2323,10 @@ static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
        if (DWC3_VER_IS_PRIOR(DWC3, 250A))
                reg |= DWC3_DEVTEN_ULSTCNGEN;
 
+       /* On 2.30a and above this bit enables U3/L2-L1 Suspend Events */
+       if (!DWC3_VER_IS_PRIOR(DWC3, 230A))
+               reg |= DWC3_DEVTEN_EOPFEN;
+
        dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
 }