usb: gadget: udc: lpc32xx: simplify vbus handling

Use a threaded IRQ to handle vbus_work instead of using the global
worqueue.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
index 5546cb5..777279f 100644 (file)
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -152,7 +152,6 @@ struct lpc32xx_udc {
 
        /* Work queues related to I2C support */
        struct work_struct      pullup_job;
-       struct work_struct      vbus_job;
        struct work_struct      power_job;
 
        /* USB device peripheral - various */
@@ -2828,11 +2827,9 @@ static irqreturn_t lpc32xx_usb_devdma_irq(int irq, void *_udc)
  * VBUS detection, pullup handler, and Gadget cable state notification
  *
  */
-static void vbus_work(struct work_struct *work)
+static void vbus_work(struct lpc32xx_udc *udc)
 {
        u8 value;
-       struct lpc32xx_udc *udc = container_of(work, struct lpc32xx_udc,
-                                              vbus_job);
 
        if (udc->enabled != 0) {
                /* Discharge VBUS real quick */
@@ -2877,9 +2874,7 @@ static irqreturn_t lpc32xx_usb_vbus_irq(int irq, void *_udc)
 {
        struct lpc32xx_udc *udc = _udc;
 
-       /* Defer handling of VBUS IRQ to work queue */
-       disable_irq_nosync(udc->udp_irq[IRQ_USB_ATX]);
-       schedule_work(&udc->vbus_job);
+       vbus_work(udc);
 
        return IRQ_HANDLED;
 }
@@ -2908,7 +2903,7 @@ static int lpc32xx_start(struct usb_gadget *gadget,
 
        /* Force VBUS process once to check for cable insertion */
        udc->last_vbus = udc->vbus = 0;
-       schedule_work(&udc->vbus_job);
+       vbus_work(udc);
 
        /* Do not re-enable ATX IRQ (3) */
        for (i = IRQ_USB_LP; i < IRQ_USB_ATX; i++)
@@ -3080,7 +3075,6 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
        /* Setup deferred workqueue data */
        udc->poweron = udc->pullup = 0;
        INIT_WORK(&udc->pullup_job, pullup_work);
-       INIT_WORK(&udc->vbus_job, vbus_work);
 #ifdef CONFIG_PM
        INIT_WORK(&udc->power_job, power_work);
 #endif
@@ -3143,8 +3137,9 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
 
        /* The transceiver interrupt is used for VBUS detection and will
           kick off the VBUS handler function */
-       retval = devm_request_irq(dev, udc->udp_irq[IRQ_USB_ATX],
-                                 lpc32xx_usb_vbus_irq, 0, "udc_otg", udc);
+       retval = devm_request_threaded_irq(dev, udc->udp_irq[IRQ_USB_ATX], NULL,
+                                          lpc32xx_usb_vbus_irq, IRQF_ONESHOT,
+                                          "udc_otg", udc);
        if (retval < 0) {
                dev_err(udc->dev, "VBUS request irq %d failed\n",
                        udc->udp_irq[IRQ_USB_ATX]);