[PATCH] usb: dwc3: pci: Allow Elkhart Lake to utilize DSM method for PM functionality

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From: Raymond Tan <raymond.tan@xxxxxxxxx>

Similar to some other IA platforms, Elkhart Lake too depends on the
PMU register write to request transition of Dx power state.

Thus, we add the PCI_DEVICE_ID_INTEL_EHLLP to the list of devices that
shall execute the ACPI _DSM method during D0/D3 sequence.

[heikki.krogerus@xxxxxxxxxxxxxxx: included Fixes tag]

Fixes: dbb0569de852 ("usb: dwc3: pci: Add Support for Intel Elkhart Lake Devices")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Raymond Tan <raymond.tan@xxxxxxxxx>
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
 drivers/usb/dwc3/dwc3-pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index f5a61f57c74f0..242b6210380a4 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -147,7 +147,8 @@ static int dwc3_pci_quirks(struct dwc3_pci *dwc)
 
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 		if (pdev->device == PCI_DEVICE_ID_INTEL_BXT ||
-				pdev->device == PCI_DEVICE_ID_INTEL_BXT_M) {
+		    pdev->device == PCI_DEVICE_ID_INTEL_BXT_M ||
+		    pdev->device == PCI_DEVICE_ID_INTEL_EHLLP) {
 			guid_parse(PCI_INTEL_BXT_DSM_GUID, &dwc->guid);
 			dwc->has_dsm_for_pm = true;
 		}
-- 
2.28.0




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