dwc3: host: Enable USB3 LPM capability

All dwc3 based xhci host controller supports USB3.0 LPM functionality.
Therefore enable it in platform data for all dwc3 based xhci device if
DWC3_HOST_USB3_LPM_ENABLE is selected in Kconfig.

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-of-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/Kconfig

@@ -93,4 +93,11 @@ config USB_DWC3_VERBOSE
 	help
 	  Say Y here to enable verbose debugging messages on DWC3 Driver.
 
+config DWC3_HOST_USB3_LPM_ENABLE
+	bool "Enable USB3 LPM Capability"
+	depends on USB_DWC3_HOST=y || USB_DWC3_DUAL_ROLE=y
+	default n
+	help
+	  Select this when you want to enable USB3 LPM with dwc3 xhci host.
+
 endif

drivers/usb/dwc3/host.c

@@ -16,12 +16,14 @@
  */
 
 #include <linux/platform_device.h>
+#include <linux/usb/xhci_pdriver.h>
 
 #include "core.h"
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
 	struct platform_device	*xhci;
+	struct usb_xhci_pdata	pdata;
 	int			ret;
 
 	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
@@ -46,6 +48,18 @@ int dwc3_host_init(struct dwc3 *dwc)
 		goto err1;
 	}
 
+	memset(&pdata, 0, sizeof(pdata));
+
+#ifdef CONFIG_DWC3_HOST_USB3_LPM_ENABLE
+	pdata.usb3_lpm_capable = 1;
+#endif
+
+	ret = platform_device_add_data(xhci, &pdata, sizeof(pdata));
+	if (ret) {
+		dev_err(dwc->dev, "couldn't add platform data to xHCI device\n");
+		goto err1;
+	}
+
 	ret = platform_device_add(xhci);
 	if (ret) {
 		dev_err(dwc->dev, "failed to register xHCI device\n");