The patch below does not apply to the 4.14-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-4.14.y git checkout FETCH_HEAD git cherry-pick -x c8540870af4ce6ddeb27a7bb5498b75fb29b643c # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023052253-bloomers-footwear-7df3@gregkh' --subject-prefix 'PATCH 4.14.y' HEAD^..

Possible dependencies:

c8540870af4c ("usb: dwc3: gadget: Improve dwc3_gadget_suspend() and dwc3_gadget_resume()") bdb19d01026a ("USB: dwc3: gadget: drop dead hibernation code") af870d93c706 ("usb: dwc3: Fix typos in gadget.c") 5265397f9442 ("usb: dwc3: Remove DWC3 locking during gadget suspend/resume") 9711c67de748 ("usb: dwc3: gadget: Synchronize IRQ between soft connect/disconnect") 8f8034f493b5 ("usb: dwc3: gadget: Don't modify GEVNTCOUNT in pullup()") 861c010a2ee1 ("usb: dwc3: gadget: Refactor pullup()") 0066472de157 ("usb: dwc3: Issue core soft reset before enabling run/stop") 8217f07a5023 ("usb: dwc3: gadget: Avoid starting DWC3 gadget during UDC unbind") 8212937305f8 ("usb: dwc3: gadget: Disable gadget IRQ during pullup disable") 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 c8540870af4ce6ddeb27a7bb5498b75fb29b643c Mon Sep 17 00:00:00 2001 From: Roger Quadros rogerq@kernel.org Date: Wed, 3 May 2023 14:00:48 +0300 Subject: [PATCH] usb: dwc3: gadget: Improve dwc3_gadget_suspend() and dwc3_gadget_resume()

Prevent -ETIMEDOUT error on .suspend(). e.g. If gadget driver is loaded and we are connected to a USB host, all transfers must be stopped before stopping the controller else we will not get a clean stop i.e. dwc3_gadget_run_stop() will take several seconds to complete and will return -ETIMEDOUT.

Handle error cases properly in dwc3_gadget_suspend(). Simplify dwc3_gadget_resume() by using the introduced helper function.

Fixes: 9f8a67b65a49 ("usb: dwc3: gadget: fix gadget suspend/resume") Cc: stable@vger.kernel.org Suggested-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Signed-off-by: Roger Quadros rogerq@kernel.org Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/20230503110048.30617-1-rogerq@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index c0ca4d12f95d..2996bcb4d53d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2699,6 +2699,21 @@ static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc) return ret; }

+static int dwc3_gadget_soft_connect(struct dwc3 *dwc) +{ + /* + * In the Synopsys DWC_usb31 1.90a programming guide section + * 4.1.9, it specifies that for a reconnect after a + * device-initiated disconnect requires a core soft reset + * (DCTL.CSftRst) before enabling the run/stop bit. + */ + dwc3_core_soft_reset(dwc); + + dwc3_event_buffers_setup(dwc); + __dwc3_gadget_start(dwc); + return dwc3_gadget_run_stop(dwc, true); +} + static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) { struct dwc3 *dwc = gadget_to_dwc(g); @@ -2737,21 +2752,10 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)

synchronize_irq(dwc->irq_gadget);

- if (!is_on) { + if (!is_on) ret = dwc3_gadget_soft_disconnect(dwc); - } else { - /* - * In the Synopsys DWC_usb31 1.90a programming guide section - * 4.1.9, it specifies that for a reconnect after a - * device-initiated disconnect requires a core soft reset - * (DCTL.CSftRst) before enabling the run/stop bit. - */ - dwc3_core_soft_reset(dwc); - - dwc3_event_buffers_setup(dwc); - __dwc3_gadget_start(dwc); - ret = dwc3_gadget_run_stop(dwc, true); - } + else + ret = dwc3_gadget_soft_connect(dwc);

pm_runtime_put(dwc->dev);

@@ -4655,42 +4659,39 @@ void dwc3_gadget_exit(struct dwc3 *dwc) int dwc3_gadget_suspend(struct dwc3 *dwc) { unsigned long flags; + int ret;

if (!dwc->gadget_driver) return 0;

- dwc3_gadget_run_stop(dwc, false); + ret = dwc3_gadget_soft_disconnect(dwc); + if (ret) + goto err;

spin_lock_irqsave(&dwc->lock, flags); dwc3_disconnect_gadget(dwc); - __dwc3_gadget_stop(dwc); spin_unlock_irqrestore(&dwc->lock, flags);

return 0; + +err: + /* + * Attempt to reset the controller's state. Likely no + * communication can be established until the host + * performs a port reset. + */ + if (dwc->softconnect) + dwc3_gadget_soft_connect(dwc); + + return ret; }

int dwc3_gadget_resume(struct dwc3 *dwc) { - int ret; - if (!dwc->gadget_driver || !dwc->softconnect) return 0;

- ret = __dwc3_gadget_start(dwc); - if (ret < 0) - goto err0; - - ret = dwc3_gadget_run_stop(dwc, true); - if (ret < 0) - goto err1; - - return 0; - -err1: - __dwc3_gadget_stop(dwc); - -err0: - return ret; + return dwc3_gadget_soft_connect(dwc); }

void dwc3_gadget_process_pending_events(struct dwc3 *dwc)