USB: pxa2xx_udc: fix misuse of clock enable/disable calls

Fix pxa2xx_udc to balance calls to clk_enable/clk_disable.

[db: remove inline #ifdefs for IXP non-support of <linux/clk.h> calls]

Signed-off-by: Dmitry Baryshkov dbaryshkov@gmail.com
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/pxa2xx_udc.c b/drivers/usb/gadget/pxa2xx_udc.c
index 4402d6f..096c41c 100644 (file)
--- a/drivers/usb/gadget/pxa2xx_udc.c
+++ b/drivers/usb/gadget/pxa2xx_udc.c
@@ -103,6 +103,12 @@ static const char ep0name [] = "ep0";
 #error "Can't configure both IXP and PXA"
 #endif
 
+/* IXP doesn't yet support <linux/clk.h> */
+#define clk_get(dev,name)      NULL
+#define clk_enable(clk)                do { } while (0)
+#define clk_disable(clk)       do { } while (0)
+#define clk_put(clk)           do { } while (0)
+
 #endif
 
 #include "pxa2xx_udc.h"
@@ -934,20 +940,31 @@ static void udc_disable(struct pxa2xx_udc *);
 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
  * in active use.
  */
-static int pullup(struct pxa2xx_udc *udc, int is_active)
+static int pullup(struct pxa2xx_udc *udc)
 {
-       is_active = is_active && udc->vbus && udc->pullup;
+       int is_active = udc->vbus && udc->pullup && !udc->suspended;
        DMSG("%s\n", is_active ? "active" : "inactive");
-       if (is_active)
-               udc_enable(udc);
-       else {
-               if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
-                       DMSG("disconnect %s\n", udc->driver
-                               ? udc->driver->driver.name
-                               : "(no driver)");
-                       stop_activity(udc, udc->driver);
+       if (is_active) {
+               if (!udc->active) {
+                       udc->active = 1;
+                       /* Enable clock for USB device */
+                       clk_enable(udc->clk);
+                       udc_enable(udc);
                }
-               udc_disable(udc);
+       } else {
+               if (udc->active) {
+                       if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
+                               DMSG("disconnect %s\n", udc->driver
+                                       ? udc->driver->driver.name
+                                       : "(no driver)");
+                               stop_activity(udc, udc->driver);
+                       }
+                       udc_disable(udc);
+                       /* Disable clock for USB device */
+                       clk_disable(udc->clk);
+                       udc->active = 0;
+               }
+
        }
        return 0;
 }
@@ -958,9 +975,9 @@ static int pxa2xx_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
        struct pxa2xx_udc       *udc;
 
        udc = container_of(_gadget, struct pxa2xx_udc, gadget);
-       udc->vbus = is_active = (is_active != 0);
+       udc->vbus = (is_active != 0);
        DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
-       pullup(udc, is_active);
+       pullup(udc);
        return 0;
 }
 
@@ -975,9 +992,8 @@ static int pxa2xx_udc_pullup(struct usb_gadget *_gadget, int is_active)
        if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
                return -EOPNOTSUPP;
 
-       is_active = (is_active != 0);
-       udc->pullup = is_active;
-       pullup(udc, is_active);
+       udc->pullup = (is_active != 0);
+       pullup(udc);
        return 0;
 }
 
@@ -997,7 +1013,7 @@ static const struct usb_gadget_ops pxa2xx_udc_ops = {
 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 
 static int
-udc_seq_show(struct seq_file *m, void *d)
+udc_seq_show(struct seq_file *m, void *_d)
 {
        struct pxa2xx_udc       *dev = m->private;
        unsigned long           flags;
@@ -1146,11 +1162,6 @@ static void udc_disable(struct pxa2xx_udc *dev)
 
        udc_clear_mask_UDCCR(UDCCR_UDE);
 
-#ifdef CONFIG_ARCH_PXA
-        /* Disable clock for USB device */
-       clk_disable(dev->clk);
-#endif
-
        ep0_idle (dev);
        dev->gadget.speed = USB_SPEED_UNKNOWN;
 }
@@ -1191,11 +1202,6 @@ static void udc_enable (struct pxa2xx_udc *dev)
 {
        udc_clear_mask_UDCCR(UDCCR_UDE);
 
-#ifdef CONFIG_ARCH_PXA
-        /* Enable clock for USB device */
-       clk_enable(dev->clk);
-#endif
-
        /* try to clear these bits before we enable the udc */
        udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
 
@@ -1286,7 +1292,7 @@ fail:
         * for set_configuration as well as eventual disconnect.
         */
        DMSG("registered gadget driver '%s'\n", driver->driver.name);
-       pullup(dev, 1);
+       pullup(dev);
        dump_state(dev);
        return 0;
 }
@@ -1329,7 +1335,8 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
                return -EINVAL;
 
        local_irq_disable();
-       pullup(dev, 0);
+       dev->pullup = 0;
+       pullup(dev);
        stop_activity(dev, driver);
        local_irq_enable();
 
@@ -2131,13 +2138,11 @@ static int __init pxa2xx_udc_probe(struct platform_device *pdev)
        if (irq < 0)
                return -ENODEV;
 
-#ifdef CONFIG_ARCH_PXA
        dev->clk = clk_get(&pdev->dev, "UDCCLK");
        if (IS_ERR(dev->clk)) {
                retval = PTR_ERR(dev->clk);
                goto err_clk;
        }
-#endif
 
        pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
                dev->has_cfr ? "" : " (!cfr)",
@@ -2250,10 +2255,8 @@ lubbock_fail0:
        if (dev->mach->gpio_vbus)
                gpio_free(dev->mach->gpio_vbus);
  err_gpio_vbus:
-#ifdef CONFIG_ARCH_PXA
        clk_put(dev->clk);
  err_clk:
-#endif
        return retval;
 }
 
@@ -2269,7 +2272,9 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
        if (dev->driver)
                return -EBUSY;
 
-       udc_disable(dev);
+       dev->pullup = 0;
+       pullup(dev);
+
        remove_debug_files(dev);
 
        if (dev->got_irq) {
@@ -2289,9 +2294,7 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
        if (dev->mach->gpio_pullup)
                gpio_free(dev->mach->gpio_pullup);
 
-#ifdef CONFIG_ARCH_PXA
        clk_put(dev->clk);
-#endif
 
        platform_set_drvdata(pdev, NULL);
        the_controller = NULL;
@@ -2317,10 +2320,15 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
 static int pxa2xx_udc_suspend(struct platform_device *dev, pm_message_t state)
 {
        struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
+       unsigned long flags;
 
        if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
                WARN("USB host won't detect disconnect!\n");
-       pullup(udc, 0);
+       udc->suspended = 1;
+
+       local_irq_save(flags);
+       pullup(udc);
+       local_irq_restore(flags);
 
        return 0;
 }
@@ -2328,8 +2336,12 @@ static int pxa2xx_udc_suspend(struct platform_device *dev, pm_message_t state)
 static int pxa2xx_udc_resume(struct platform_device *dev)
 {
        struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
+       unsigned long flags;
 
-       pullup(udc, 1);
+       udc->suspended = 0;
+       local_irq_save(flags);
+       pullup(udc);
+       local_irq_restore(flags);
 
        return 0;
 }

diff --git a/drivers/usb/gadget/pxa2xx_udc.h b/drivers/usb/gadget/pxa2xx_udc.h
index b67e3ff..e2c19e8 100644 (file)
--- a/drivers/usb/gadget/pxa2xx_udc.h
+++ b/drivers/usb/gadget/pxa2xx_udc.h
@@ -119,7 +119,9 @@ struct pxa2xx_udc {
                                                has_cfr : 1,
                                                req_pending : 1,
                                                req_std : 1,
-                                               req_config : 1;
+                                               req_config : 1,
+                                               suspended : 1,
+                                               active : 1;
 
 #define start_watchdog(dev) mod_timer(&dev->timer, jiffies + (HZ/200))
        struct timer_list                       timer;