usb: gadget: udc: lpc32xx: rework interrupt handling

There is no actual need to do the enable/disable_irq dance. Instead enable
the interrupts on the phy only when necessary.

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 5d6246d..d8f1c60 100644 (file)
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -617,17 +617,13 @@ static void isp1301_udc_configure(struct lpc32xx_udc *udc)
                (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
                OTG1_VBUS_DISCHRG);
 
-       /* Clear and enable VBUS high edge interrupt */
        i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
                ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
+
        i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
                ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
        i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
-               ISP1301_I2C_INTERRUPT_FALLING, INT_SESS_VLD | INT_VBUS_VLD);
-       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
                ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
-       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
-               ISP1301_I2C_INTERRUPT_RISING, INT_SESS_VLD | INT_VBUS_VLD);
 
        dev_info(udc->dev, "ISP1301 Vendor ID  : 0x%04x\n", vendor);
        dev_info(udc->dev, "ISP1301 Product ID : 0x%04x\n", product);
@@ -2887,9 +2883,6 @@ static void vbus_work(struct lpc32xx_udc *udc)
                        lpc32xx_vbus_session(&udc->gadget, udc->vbus);
                }
        }
-
-       /* Re-enable after completion */
-       enable_irq(udc->udp_irq[IRQ_USB_ATX]);
 }
 
 static irqreturn_t lpc32xx_usb_vbus_irq(int irq, void *_udc)
@@ -2905,7 +2898,6 @@ static int lpc32xx_start(struct usb_gadget *gadget,
                         struct usb_gadget_driver *driver)
 {
        struct lpc32xx_udc *udc = to_udc(gadget);
-       int i;
 
        if (!driver || driver->max_speed < USB_SPEED_FULL || !driver->setup) {
                dev_err(udc->dev, "bad parameter.\n");
@@ -2927,20 +2919,23 @@ static int lpc32xx_start(struct usb_gadget *gadget,
        udc->last_vbus = udc->vbus = 0;
        vbus_work(udc);
 
-       /* Do not re-enable ATX IRQ (3) */
-       for (i = IRQ_USB_LP; i < IRQ_USB_ATX; i++)
-               enable_irq(udc->udp_irq[i]);
+       /* enable interrupts */
+       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
+               ISP1301_I2C_INTERRUPT_FALLING, INT_SESS_VLD | INT_VBUS_VLD);
+       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
+               ISP1301_I2C_INTERRUPT_RISING, INT_SESS_VLD | INT_VBUS_VLD);
 
        return 0;
 }
 
 static int lpc32xx_stop(struct usb_gadget *gadget)
 {
-       int i;
        struct lpc32xx_udc *udc = to_udc(gadget);
 
-       for (i = IRQ_USB_LP; i <= IRQ_USB_ATX; i++)
-               disable_irq(udc->udp_irq[i]);
+       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
+               ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
+       i2c_smbus_write_byte_data(udc->isp1301_i2c_client,
+               ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 
        if (udc->clocked) {
                spin_lock(&udc->lock);
@@ -3172,10 +3167,6 @@ static int lpc32xx_udc_probe(struct platform_device *pdev)
        init_waitqueue_head(&udc->ep_disable_wait_queue);
        atomic_set(&udc->enabled_ep_cnt, 0);
 
-       /* Keep all IRQs disabled until GadgetFS starts up */
-       for (i = IRQ_USB_LP; i <= IRQ_USB_ATX; i++)
-               disable_irq(udc->udp_irq[i]);
-
        retval = usb_add_gadget_udc(dev, &udc->gadget);
        if (retval < 0)
                goto add_gadget_fail;