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FAILED: patch "[PATCH] usb: dwc3: fix gadget mode suspend interrupt handler issue" failed to apply to 5.15-stable tree

PATCH [email protected] 1 participant 1 message May 22, 2023

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Stable branch USB DesignWare USB3 DRD IP driver
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The patch below does not apply to the 5.15-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]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 4e8ef34e36f2839ef8c8da521ab7035956436818
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023052255-basics-sixfold-353c@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

4e8ef34e36f2 ("usb: dwc3: fix gadget mode suspend interrupt handler issue") 92c08a84b53e ("usb: dwc3: Add function suspend and function wakeup support") 047161686b81 ("usb: dwc3: Add remote wakeup handling") 63c4c320ccf7 ("usb: dwc3: gadget: Check for L1/L2/U3 for Start Transfer")

thanks,

greg k-h

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

From 4e8ef34e36f2839ef8c8da521ab7035956436818 Mon Sep 17 00:00:00 2001
From: Linyu Yuan <[email protected]>
Date: Fri, 12 May 2023 08:45:24 +0800
Subject: [PATCH] usb: dwc3: fix gadget mode suspend interrupt handler issue

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 <[email protected]>
Acked-by Thinh Nguyen <[email protected]>
Signed-off-by Linyu Yuan <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Greg Kroah-Hartman <[email protected]>
drivers/usb/dwc3/core.h +2 -0
index d56457c02996..1f043c31a096 100644
@@ -1116,6 +1116,7 @@ struct dwc3_scratchpad_array {
  * @dis_metastability_quirk: set to disable metastability quirk.
  * @dis_split_quirk: set to disable split boundary.
  * @wakeup_configured: set if the device is configured for remote wakeup.
+ * @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.

@@ -1332,6 +1333,7 @@ struct dwc3 {
 	unsigned		dis_split_quirk:1;
 	unsigned		async_callbacks:1;
 	unsigned		wakeup_configured:1;
+	unsigned		suspended:1;
 
 	u16			imod_interval;
drivers/usb/dwc3/gadget.c +11 -1
index 2996bcb4d53d..d831f5acf7b5 100644
@@ -2440,6 +2440,7 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
 			return -EINVAL;
 		}
 		dwc3_resume_gadget(dwc);
+		dwc->suspended = false;
 		dwc->link_state = DWC3_LINK_STATE_U0;
 	}
 

@@ -3942,6 +3943,8 @@ 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);

@@ -3966,6 +3969,8 @@ 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.

@@ -4184,6 +4189,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 
 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
 {
+	dwc->suspended = false;
+
 	/*
 	 * TODO take core out of low power mode when that's
 	 * implemented.

@@ -4281,6 +4288,7 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
 		if (dwc->gadget->wakeup_armed) {
 			dwc3_gadget_enable_linksts_evts(dwc, false);
 			dwc3_resume_gadget(dwc);
+			dwc->suspended = false;
 		}
 		break;
 	case DWC3_LINK_STATE_U1:

@@ -4307,8 +4315,10 @@ 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;
 }