diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-02-28 13:06:11 +0100 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2014-03-05 21:40:06 +0100 |
| commit | b83e333a4d03b73eb5ea7fc1cb86683c2575b237 (patch) | |
| tree | 4346066f0dfd5b6fdaaeeb1fd257d6a311046e23 /drivers/usb/gadget/s3c-hsotg.c | |
| parent | usb: musb: musb_cppi41: Dont reprogram DMA if tear down is initiated (diff) | |
| download | linux-b83e333a4d03b73eb5ea7fc1cb86683c2575b237.tar.xz linux-b83e333a4d03b73eb5ea7fc1cb86683c2575b237.zip | |
usb: gadget: s3c-hsotg: add proper suspend/resume support
This patch adds suspend/resume support to s3c-hsotg driver. It makes UDC
driver more power efficient.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget/s3c-hsotg.c')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 53 |
1 files changed, 49 insertions, 4 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 99c8e3ca6a3c..2a9cb674926a 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -3774,10 +3774,55 @@ static int s3c_hsotg_remove(struct platform_device *pdev) return 0; } -#if 1 -#define s3c_hsotg_suspend NULL -#define s3c_hsotg_resume NULL -#endif +static int s3c_hsotg_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct s3c_hsotg *hsotg = platform_get_drvdata(pdev); + unsigned long flags; + int ret = 0; + + if (hsotg->driver) + dev_info(hsotg->dev, "suspending usb gadget %s\n", + hsotg->driver->driver.name); + + spin_lock_irqsave(&hsotg->lock, flags); + s3c_hsotg_disconnect(hsotg); + s3c_hsotg_phy_disable(hsotg); + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + spin_unlock_irqrestore(&hsotg->lock, flags); + + if (hsotg->driver) { + int ep; + for (ep = 0; ep < hsotg->num_of_eps; ep++) + s3c_hsotg_ep_disable(&hsotg->eps[ep].ep); + + ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), + hsotg->supplies); + } + + return ret; +} + +static int s3c_hsotg_resume(struct platform_device *pdev) +{ + struct s3c_hsotg *hsotg = platform_get_drvdata(pdev); + unsigned long flags; + int ret = 0; + + if (hsotg->driver) { + dev_info(hsotg->dev, "resuming usb gadget %s\n", + hsotg->driver->driver.name); + ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies), + hsotg->supplies); + } + + spin_lock_irqsave(&hsotg->lock, flags); + hsotg->last_rst = jiffies; + s3c_hsotg_phy_enable(hsotg); + s3c_hsotg_core_init(hsotg); + spin_unlock_irqrestore(&hsotg->lock, flags); + + return ret; +} #ifdef CONFIG_OF static const struct of_device_id s3c_hsotg_of_ids[] = { |