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usb: dwc3: pci: call _DSM for suspend/resume 

Intel's BXT devices need to execute a _DSM method
during {runtime_,}{suspend,resume} in order to get a
chunk of dwc3 to power gate and save some extra
power.

Let's do that now.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-10-24 10:40:18 +03:00
parent 0f817ae696
commit 9cecca75b5
2 changed files with 62 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/dwc3/Kconfig
View File

@ -70,7 +70,7 @@ config USB_DWC3_EXYNOS
config USB_DWC3_PCI
tristate "PCIe-based Platforms"
depends on PCI
depends on PCI && ACPI
default USB_DWC3
help
If you're using the DesignWare Core IP with a PCIe, please say

73
drivers/usb/dwc3/dwc3-pci.c
View File

@ -39,14 +39,25 @@
#define PCI_DEVICE_ID_INTEL_APL 0x5aaa
#define PCI_DEVICE_ID_INTEL_KBP 0xa2b0
#define PCI_INTEL_BXT_DSM_UUID "732b85d5-b7a7-4a1b-9ba0-4bbd00ffd511"
#define PCI_INTEL_BXT_FUNC_PMU_PWR 4
#define PCI_INTEL_BXT_STATE_D0 0
#define PCI_INTEL_BXT_STATE_D3 3
/**
* struct dwc3_pci - Driver private structure
* @dwc3: child dwc3 platform_device
* @pci: our link to PCI bus
* @uuid: _DSM UUID
* @has_dsm_for_pm: true for devices which need to run _DSM on runtime PM
*/
struct dwc3_pci {
struct platform_device *dwc3;
struct pci_dev *pci;
u8 uuid[16];
unsigned int has_dsm_for_pm:1;
};
static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
@ -102,6 +113,12 @@ static int dwc3_pci_quirks(struct dwc3_pci *dwc)
if (ret < 0)
return ret;
if (pdev->device == PCI_DEVICE_ID_INTEL_BXT ||
pdev->device == PCI_DEVICE_ID_INTEL_BXT_M) {
acpi_str_to_uuid(PCI_INTEL_BXT_DSM_UUID, dwc->uuid);
dwc->has_dsm_for_pm = true;
}
if (pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
struct gpio_desc *gpio;
@ -149,6 +166,30 @@ static int dwc3_pci_quirks(struct dwc3_pci *dwc)
return 0;
}
static int dwc3_pci_dsm(struct dwc3_pci *dwc, int param)
{
union acpi_object *obj;
union acpi_object tmp;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
if (!dwc->has_dsm_for_pm)
return 0;
tmp.type = ACPI_TYPE_INTEGER;
tmp.integer.value = param;
obj = acpi_evaluate_dsm(ACPI_HANDLE(&dwc->pci->dev), dwc->uuid,
1, PCI_INTEL_BXT_FUNC_PMU_PWR, &argv4);
if (!obj) {
dev_err(&dwc->pci->dev, "failed to evaluate _DSM\n");
return -EIO;
}
ACPI_FREE(obj);
return 0;
}
static int dwc3_pci_probe(struct pci_dev *pci,
const struct pci_device_id *id)
{
@ -255,8 +296,10 @@ MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
#ifdef CONFIG_PM
static int dwc3_pci_runtime_suspend(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
if (device_run_wake(dev))
return 0;
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
return -EBUSY;
}
@ -265,28 +308,34 @@ static int dwc3_pci_runtime_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
struct platform_device *dwc3 = dwc->dwc3;
int ret;
ret = dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
if (ret)
return ret;
return pm_runtime_get(&dwc3->dev);
}
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
static int dwc3_pci_pm_dummy(struct device *dev)
static int dwc3_pci_suspend(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;
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D3);
}
static int dwc3_pci_resume(struct device *dev)
{
struct dwc3_pci *dwc = dev_get_drvdata(dev);
return dwc3_pci_dsm(dwc, PCI_INTEL_BXT_STATE_D0);
}
#endif /* CONFIG_PM_SLEEP */
static struct dev_pm_ops dwc3_pci_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_pm_dummy, dwc3_pci_pm_dummy)
SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_suspend, dwc3_pci_resume)
SET_RUNTIME_PM_OPS(dwc3_pci_runtime_suspend, dwc3_pci_runtime_resume,
NULL)
};