[PATCH 4.19] usb: dwc3: gadget: Enable suspend events

[Jack Pham <jackp@codeaurora.org>]

commit d1d90dd27254c44d087ad3f8b5b3e4fff0571f45 upstream.

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>
[jackp@codeaurora.org: backport to pre-5.7 by replacing
 DWC3_IS_VER_PRIOR check with direct comparison of dwc->revision]
Signed-off-by: Jack Pham <jackp@codeaurora.org>
---
 drivers/usb/dwc3/gadget.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 8ce13f5e83c7..2eac817a43d6 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1834,6 +1834,10 @@ static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
 	if (dwc->revision < DWC3_REVISION_250A)
 		reg |= DWC3_DEVTEN_ULSTCNGEN;
 
+	/* On 2.30a and above this bit enables U3/L2-L1 Suspend Events */
+	if (dwc->revision >= DWC3_REVISION_230A)
+		reg |= DWC3_DEVTEN_EOPFEN;
+
 	dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
 }
 
-- 
2.24.0