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Commit e9af9229 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: pci: add Power Management dummy hooks 



Allow for dwc3-pci to reach D3 and enable pm_runtime
by providing dummy PM hooks. Without them, PCI
subsystem won't put device to D3.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent fc8bb91b

drivers/usb/dwc3/dwc3-pci.c

+39 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/module.h>

#include <linux/slab.h>

#include <linux/pci.h>

#include <linux/pm_runtime.h>

#include <linux/platform_device.h>

#include <linux/gpio/consumer.h>

#include <linux/acpi.h>
@@ -180,7 +181,11 @@ static int dwc3_pci_probe(struct pci_dev *pci, 
		goto err;

	}



	device_init_wakeup(dev, true);

	device_set_run_wake(dev, true);

	pci_set_drvdata(pci, dwc3);

	pm_runtime_put(dev);



	return 0;

err:

	platform_device_put(dwc3);
@@ -189,6 +194,8 @@ static int dwc3_pci_probe(struct pci_dev *pci, 


static void dwc3_pci_remove(struct pci_dev *pci)

{

	device_init_wakeup(&pci->dev, false);

	pm_runtime_get(&pci->dev);

	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pci->dev));

	platform_device_unregister(pci_get_drvdata(pci));

}
@@ -219,11 +226,43 @@ static const struct pci_device_id dwc3_pci_id_table[] = { 
};

MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);



#ifdef CONFIG_PM

static int dwc3_pci_runtime_suspend(struct device *dev)

{

	if (device_run_wake(dev))

		return 0;



	return -EBUSY;

}



static int dwc3_pci_pm_dummy(struct device *dev)

{

	/*

	 * There's nothing to do here. No, seriously. Everything is either taken

	 * care either by PCI subsystem or dwc3/core.c, so we have nothing

	 * missing here.

	 *

	 * So you'd think we didn't need this at all, but PCI subsystem will

	 * bail out if we don't have a valid callback :-s

	 */

	return 0;

}

#endif /* CONFIG_PM */



static struct dev_pm_ops dwc3_pci_dev_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_pm_dummy, dwc3_pci_pm_dummy)

	SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_pm_dummy,

		NULL)

};



static struct pci_driver dwc3_pci_driver = {

	.name		= "dwc3-pci",

	.id_table	= dwc3_pci_id_table,

	.probe		= dwc3_pci_probe,

	.remove		= dwc3_pci_remove,

	.driver		= {

		.pm	= &dwc3_pci_dev_pm_ops,

	}

};



MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");