diff options
| author | Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> | 2021-11-18 15:01:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-23 16:12:40 +0300 |
| commit | e4ac5a40cec2ac0dcc050262ec9d97a8efa06b0b (patch) | |
| tree | a8e2e7c26b72bb007f01a3911b477510b317a878 /drivers | |
| parent | 4616dddcfaf75cfbfbff7ce8a468038c697444ce (diff) | |
| download | linux-e4ac5a40cec2ac0dcc050262ec9d97a8efa06b0b.tar.xz | |
usb: xilinx: Add suspend resume support
Add suspend resume support. In the suspend udc is suspended
and it is set to ready at resume for it to be functional.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20211118120143.1079-1-shubhrajyoti.datta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/gadget/udc/udc-xilinx.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c index f5ca670776a3..d8585f46f93b 100644 --- a/drivers/usb/gadget/udc/udc-xilinx.c +++ b/drivers/usb/gadget/udc/udc-xilinx.c @@ -2176,6 +2176,61 @@ static int xudc_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int xudc_suspend(struct device *dev) +{ + struct xusb_udc *udc; + u32 crtlreg; + unsigned long flags; + + udc = dev_get_drvdata(dev); + + spin_lock_irqsave(&udc->lock, flags); + + crtlreg = udc->read_fn(udc->addr + XUSB_CONTROL_OFFSET); + crtlreg &= ~XUSB_CONTROL_USB_READY_MASK; + + udc->write_fn(udc->addr, XUSB_CONTROL_OFFSET, crtlreg); + + spin_unlock_irqrestore(&udc->lock, flags); + if (udc->driver && udc->driver->suspend) + udc->driver->suspend(&udc->gadget); + + clk_disable(udc->clk); + + return 0; +} + +static int xudc_resume(struct device *dev) +{ + struct xusb_udc *udc; + u32 crtlreg; + unsigned long flags; + int ret; + + udc = dev_get_drvdata(dev); + + ret = clk_enable(udc->clk); + if (ret < 0) + return ret; + + spin_lock_irqsave(&udc->lock, flags); + + crtlreg = udc->read_fn(udc->addr + XUSB_CONTROL_OFFSET); + crtlreg |= XUSB_CONTROL_USB_READY_MASK; + + udc->write_fn(udc->addr, XUSB_CONTROL_OFFSET, crtlreg); + + spin_unlock_irqrestore(&udc->lock, flags); + + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops xudc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(xudc_suspend, xudc_resume) +}; + /* Match table for of_platform binding */ static const struct of_device_id usb_of_match[] = { { .compatible = "xlnx,usb2-device-4.00.a", }, @@ -2187,6 +2242,7 @@ static struct platform_driver xudc_driver = { .driver = { .name = driver_name, .of_match_table = usb_of_match, + .pm = &xudc_pm_ops, }, .probe = xudc_probe, .remove = xudc_remove, |