usb: host: xhci-plat: set resume_quirk() for R-Car controllers

This patch sets resume_quirk() for R-Car controllers to re-download
the firmware in resume timing. Otherwise, if the controller's power
is down in suspend timing, the firmware in the controller goes away,
and then the controller doesn't work after resume.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-plat.c

@@ -103,18 +103,21 @@ static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
 	.init_quirk = xhci_rcar_init_quirk,
 	.plat_start = xhci_rcar_start,
+	.resume_quirk = xhci_rcar_resume_quirk,
 };
 
 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
 	.init_quirk = xhci_rcar_init_quirk,
 	.plat_start = xhci_rcar_start,
+	.resume_quirk = xhci_rcar_resume_quirk,
 };
 
 static const struct xhci_plat_priv xhci_plat_renesas_rcar_r8a7796 = {
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3,
 	.init_quirk = xhci_rcar_init_quirk,
 	.plat_start = xhci_rcar_start,
+	.resume_quirk = xhci_rcar_resume_quirk,
 };
 
 static const struct of_device_id usb_xhci_of_match[] = {

drivers/usb/host/xhci-rcar.c

@@ -198,3 +198,14 @@ int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 
 	return xhci_rcar_download_firmware(hcd);
 }
+
+int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
+{
+	int ret;
+
+	ret = xhci_rcar_download_firmware(hcd);
+	if (!ret)
+		xhci_rcar_start(hcd);
+
+	return ret;
+}

drivers/usb/host/xhci-rcar.h

@@ -18,6 +18,7 @@
 #if IS_ENABLED(CONFIG_USB_XHCI_RCAR)
 void xhci_rcar_start(struct usb_hcd *hcd);
 int xhci_rcar_init_quirk(struct usb_hcd *hcd);
+int xhci_rcar_resume_quirk(struct usb_hcd *hcd);
 #else
 static inline void xhci_rcar_start(struct usb_hcd *hcd)
 {
@@ -27,5 +28,10 @@ static inline int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 {
 	return 0;
 }
+
+static inline int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
+{
+	return 0;
+}
 #endif
 #endif /* _XHCI_RCAR_H */