FAILED: patch "[PATCH] usb: mtu3: fix random remote wakeup" failed to apply to 5.13-stable tree

The patch below does not apply to the 5.13-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d98a30ccdc839947c9233369744341d1fa54439c Mon Sep 17 00:00:00 2001
From: Chunfeng Yun <[email protected]>
Date: Thu, 26 Aug 2021 16:36:37 +0800
Subject: [PATCH] usb: mtu3: fix random remote wakeup

Some platforms, e.g. 8183/8192, use low level latch way to keep wakeup signal, it may latch a wrong signal if debounce more time, and enable wakeup earlier.

                   ____________________
ip_sleep      ____/                    \__________
                           ___________________
wakeup_signal ____________/                   \______
                      _______________________________
wakeup_en     _______/
                      ^     ^
                      |(1)  |(2)

latch wakeup_signal mistakenly at (1), should latch it at (2);

Workaround: delay about 100us to enable wakeup, meanwhile decrease debounce time.

index 7d528f3c2482..f3903367a6a0 100644
@@ -62,7 +62,7 @@ static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable)
 	case SSUSB_UWK_V1_1:
 		reg = ssusb->uwk_reg_base + PERI_WK_CTRL0;
 		msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
-		val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
+		val = enable ? (WC0_IS_EN | WC0_IS_C(0x1)) : 0;
 		break;
 	case SSUSB_UWK_V1_2:
 		reg = ssusb->uwk_reg_base + PERI_WK_CTRL0;

index 5b3f7f73cb40..f13531022f4a 100644
@@ -63,6 +63,9 @@ static int wait_for_ip_sleep(struct ssusb_mtk *ssusb)
 	if (ret) {
 		dev_err(ssusb->dev, "ip sleep failed!!!\n");
 		ret = -EBUSY;
+	} else {
+		/* workaround: avoid wrong wakeup signal latch for some soc */
+		usleep_range(100, 200);
 	}
 
 	return ret;