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usb: musb: core: Convert babble recover work to delayed work 

During babble condition both first disconnect of devices are
initiated. Make sure MUSB controller is reset and re-initialized
after all disconnects.

To acheive this schedule a delayed work for babble recovery.

While at that convert udelay to usleep_range.
Refer Documentation/timers/timers-howto.txt

Signed-off-by: George Cherian <george.cherian@ti.com>
Tested-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
George Cherian 2014-07-16 18:22:10 +05:30 коммит произвёл Felipe Balbi
Родитель 97b4129e05
Коммит 675ae76311
2 изменённых файлов: 9 добавлений и 8 удалений
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15
drivers/usb/musb/musb_core.c
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@ -850,7 +850,8 @@ b_host:
/* handle babble condition */
if (int_usb & MUSB_INTR_BABBLE && is_host_active(musb))
schedule_work(&musb->recover_work);
schedule_delayed_work(&musb->recover_work,
msecs_to_jiffies(100));
#if 0
/* REVISIT ... this would be for multiplexing periodic endpoints, or
@ -1751,16 +1752,16 @@ static void musb_irq_work(struct work_struct *data)
/* Recover from babble interrupt conditions */
static void musb_recover_work(struct work_struct *data)
{
struct musb *musb = container_of(data, struct musb, recover_work);
struct musb *musb = container_of(data, struct musb, recover_work.work);
int status;
musb_platform_reset(musb);
usb_phy_vbus_off(musb->xceiv);
udelay(100);
usleep_range(100, 200);
usb_phy_vbus_on(musb->xceiv);
udelay(100);
usleep_range(100, 200);
/*
* When a babble condition occurs, the musb controller removes the
@ -1943,7 +1944,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
/* Init IRQ workqueue before request_irq */
INIT_WORK(&musb->irq_work, musb_irq_work);
INIT_WORK(&musb->recover_work, musb_recover_work);
INIT_DELAYED_WORK(&musb->recover_work, musb_recover_work);
INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
@ -2039,7 +2040,7 @@ fail4:
fail3:
cancel_work_sync(&musb->irq_work);
cancel_work_sync(&musb->recover_work);
cancel_delayed_work_sync(&musb->recover_work);
cancel_delayed_work_sync(&musb->finish_resume_work);
cancel_delayed_work_sync(&musb->deassert_reset_work);
if (musb->dma_controller)
@ -2105,7 +2106,7 @@ static int musb_remove(struct platform_device *pdev)
dma_controller_destroy(musb->dma_controller);
cancel_work_sync(&musb->irq_work);
cancel_work_sync(&musb->recover_work);
cancel_delayed_work_sync(&musb->recover_work);
cancel_delayed_work_sync(&musb->finish_resume_work);
cancel_delayed_work_sync(&musb->deassert_reset_work);
musb_free(musb);

2
drivers/usb/musb/musb_core.h
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@ -297,7 +297,7 @@ struct musb {
irqreturn_t (*isr)(int, void *);
struct work_struct irq_work;
struct work_struct recover_work;
struct delayed_work recover_work;
struct delayed_work deassert_reset_work;
struct delayed_work finish_resume_work;
u16 hwvers;