linux-kernel - [PATCH v3 6/8] usb: dwc3: Increase DWC3 controller halt timeout

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Date:   Mon, 15 Aug 2022 14:31:32 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>, <Thinh.Nguyen@...opsys.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v3 6/8] usb: dwc3: Increase DWC3 controller halt timeout

Since EP0 transactions need to be completed before the controller halt
sequence is finished, this may take some time depending on the host and the
enabled functions.  Increase the controller halt timeout, so that we give
the controller sufficient time to handle EP0 transfers.  Remove the need
for making dwc3_gadget_suspend() and dwc3_gadget_resume() to be called in
a spinlock.

Suggested-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 drivers/usb/dwc3/core.c   | 4 ----
 drivers/usb/dwc3/gadget.c | 8 +++++++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c5c238ab3083..23e123a1ab5f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1976,9 +1976,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
 	case DWC3_GCTL_PRTCAP_DEVICE:
 		if (pm_runtime_suspended(dwc->dev))
 			break;
-		spin_lock_irqsave(&dwc->lock, flags);
 		dwc3_gadget_suspend(dwc);
-		spin_unlock_irqrestore(&dwc->lock, flags);
 		synchronize_irq(dwc->irq_gadget);
 		dwc3_core_exit(dwc);
 		break;
@@ -2039,9 +2037,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
 			return ret;
 
 		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
-		spin_lock_irqsave(&dwc->lock, flags);
 		dwc3_gadget_resume(dwc);
-		spin_unlock_irqrestore(&dwc->lock, flags);
 		break;
 	case DWC3_GCTL_PRTCAP_HOST:
 		if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7b66a54250a0..b2668a83cc29 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2444,7 +2444,7 @@ static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
 static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
 {
 	u32			reg;
-	u32			timeout = 500;
+	u32			timeout = 100;
 
 	if (pm_runtime_suspended(dwc->dev))
 		return 0;
@@ -2477,6 +2477,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
 	dwc3_gadget_dctl_write_safe(dwc, reg);
 
 	do {
+		msleep(20);
 		reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 		reg &= DWC3_DSTS_DEVCTRLHLT;
 	} while (--timeout && !(!is_on ^ !reg));
@@ -4520,12 +4521,17 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
 int dwc3_gadget_suspend(struct dwc3 *dwc)
 {
+	unsigned long flags;
+
 	if (!dwc->gadget_driver)
 		return 0;
 
 	dwc3_gadget_run_stop(dwc, false, false);
+
+	spin_lock_irqsave(&dwc->lock, flags);
 	dwc3_disconnect_gadget(dwc);
 	__dwc3_gadget_stop(dwc);
+	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	return 0;
 }