From d1d90dd27254c44d087ad3f8b5b3e4fff0571f45 Mon Sep 17 00:00:00 2001

From: Jack Pham <jackp@codeaurora.org>

Date: Wed, 28 Apr 2021 02:01:10 -0700

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

Git-commit: d1d90dd27254c44d087ad3f8b5b3e4fff0571f45

Patch-mainline: v5.13-rc2

References: git-fixes

[ backport note: open-coded the missing DWC3_VER_IS_PRIOR() macro -- tiwai ]

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>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/usb/dwc3/gadget.c |    4 ++++

 1 file changed, 4 insertions(+)

--- a/drivers/usb/dwc3/gadget.c

+++ b/drivers/usb/dwc3/gadget.c

@@ -1959,6 +1959,10 @@ static void dwc3_gadget_enable_irq(struc

 	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);

 }