[RFC 4/5] USB: EHCI: Notify HCD about HNP enabled port suspend

[Pavankumar Kondeti <pkondeti@codeaurora.org>]

Introduce start_hnp callback function for HCD to receive notification
from EHCI core that HNP enabled port is suspended.  HCD may initiate
HNP or notify the same to OTG via otg_start_hnp().

This patch is inspired by "USB: Hook start_hnp into ohci struct"
(e8b24450).

Change-Id: I8e258a6fdf42c166ea9cb3a727e4d3d28a8adc72
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
---
 drivers/usb/host/ehci-hub.c |   11 +++++++++++
 drivers/usb/host/ehci.h     |    2 ++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 796ea0c..65bf104 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -1018,6 +1018,17 @@ static int ehci_hub_control (
 					|| (temp & PORT_RESET) != 0)
 				goto error;
 
+#ifdef	CONFIG_USB_OTG
+			if (hcd->self.otg_port == (wIndex + 1) &&
+					hcd->self.b_hnp_enable &&
+					ehci->start_hnp) {
+				ehci_writel(ehci, temp | PORT_SUSPEND,
+						status_reg);
+				set_bit(wIndex, &ehci->suspended_ports);
+				ehci->start_hnp(ehci);
+				break;
+			}
+#endif
 			/* After above check the port must be connected.
 			 * Set appropriate bit thus could put phy into low power
 			 * mode if we have hostpc feature
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index fd1c53d..a4989f2 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -122,6 +122,8 @@ struct ehci_hcd {			/* one per controller */
 	ktime_t			last_periodic_enable;
 	u32			command;
 
+	void (*start_hnp)(struct ehci_hcd *ehci);
+
 	/* SILICON QUIRKS */
 	unsigned		no_selective_suspend:1;
 	unsigned		has_fsl_port_bug:1; /* FreeScale */
-- 
1.7.1

--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.