The patch below does not apply to the 5.10-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 stable@vger.kernel.org.

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-5.10.y git checkout FETCH_HEAD git cherry-pick -x 4e8ef34e36f2839ef8c8da521ab7035956436818 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023052256-hence-answering-7047@gregkh' --subject-prefix 'PATCH 5.10.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") 40edb52298df ("usb: dwc3: avoid NULL access of usb_gadget_driver") c560e76319a9 ("usb: dwc3: gadget: Fix START_TRANSFER link state check") 475e8be53d04 ("usb: dwc3: gadget: Check for disabled LPM quirk") f09ddcfcb8c5 ("usb: dwc3: gadget: Prevent EP queuing while stopping transfers") a66a7d48f34a ("Merge 5.11-rc3 into usb-next")

thanks,

greg k-h

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

From 4e8ef34e36f2839ef8c8da521ab7035956436818 Mon Sep 17 00:00:00 2001 From: Linyu Yuan quic_linyyuan@quicinc.com 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 stable@kernel.org Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Signed-off-by: Linyu Yuan quic_linyyuan@quicinc.com Link: https://lore.kernel.org/r/20230512004524.31950-1-quic_linyyuan@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index d56457c02996..1f043c31a096 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -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;

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 2996bcb4d53d..d831f5acf7b5 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -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; }