USB: r8a66597-hcd: suspend/resume support

Fix the problem that system cannot suspend.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 102 insertions, 1 deletions

diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 713f4cf..f1626e5 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1013,6 +1013,9 @@ static void r8a66597_check_syssts(struct r8a66597 *r8a66597, int port,
 
 	r8a66597_write(r8a66597, ~DTCH, get_intsts_reg(port));
 	r8a66597_bset(r8a66597, DTCHE, get_intenb_reg(port));
+
+	if (r8a66597->bus_suspended)
+		usb_hcd_resume_root_hub(r8a66597_to_hcd(r8a66597));
 }
 
 /* this function must be called with interrupt disabled */
@@ -1614,6 +1617,11 @@ static irqreturn_t r8a66597_irq(struct usb_hcd *hcd)
 			r8a66597_bclr(r8a66597, DTCHE, INTENB2);
 			r8a66597_usb_disconnect(r8a66597, 1);
 		}
+		if (mask2 & BCHG) {
+			r8a66597_write(r8a66597, ~BCHG, INTSTS2);
+			r8a66597_bclr(r8a66597, BCHGE, INTENB2);
+			usb_hcd_resume_root_hub(r8a66597_to_hcd(r8a66597));
+		}
 	}
 
 	if (mask1) {
@@ -1629,6 +1637,12 @@ static irqreturn_t r8a66597_irq(struct usb_hcd *hcd)
 			r8a66597_bclr(r8a66597, DTCHE, INTENB1);
 			r8a66597_usb_disconnect(r8a66597, 0);
 		}
+		if (mask1 & BCHG) {
+			r8a66597_write(r8a66597, ~BCHG, INTSTS1);
+			r8a66597_bclr(r8a66597, BCHGE, INTENB1);
+			usb_hcd_resume_root_hub(r8a66597_to_hcd(r8a66597));
+		}
+
 		if (mask1 & SIGN) {
 			r8a66597_write(r8a66597, ~SIGN, INTSTS1);
 			status = get_urb_error(r8a66597, 0);
@@ -2140,7 +2154,7 @@ static int r8a66597_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 
 		switch (wValue) {
 		case USB_PORT_FEAT_ENABLE:
-			rh->port &= (1 << USB_PORT_FEAT_POWER);
+			rh->port &= ~(1 << USB_PORT_FEAT_POWER);
 			break;
 		case USB_PORT_FEAT_SUSPEND:
 			break;
@@ -2212,6 +2226,68 @@ error:
 	return ret;
 }
 
+#if defined(CONFIG_PM)
+static int r8a66597_bus_suspend(struct usb_hcd *hcd)
+{
+	struct r8a66597 *r8a66597 = hcd_to_r8a66597(hcd);
+	int port;
+
+	dbg("%s", __func__);
+
+	for (port = 0; port < R8A66597_MAX_ROOT_HUB; port++) {
+		struct r8a66597_root_hub *rh = &r8a66597->root_hub[port];
+		unsigned long dvstctr_reg = get_dvstctr_reg(port);
+
+		if (!(rh->port & (1 << USB_PORT_FEAT_ENABLE)))
+			continue;
+
+		dbg("suspend port = %d", port);
+		r8a66597_bclr(r8a66597, UACT, dvstctr_reg);	/* suspend */
+		rh->port |= 1 << USB_PORT_FEAT_SUSPEND;
+
+		if (rh->dev->udev->do_remote_wakeup) {
+			msleep(3);	/* waiting last SOF */
+			r8a66597_bset(r8a66597, RWUPE, dvstctr_reg);
+			r8a66597_write(r8a66597, ~BCHG, get_intsts_reg(port));
+			r8a66597_bset(r8a66597, BCHGE, get_intenb_reg(port));
+		}
+	}
+
+	r8a66597->bus_suspended = 1;
+
+	return 0;
+}
+
+static int r8a66597_bus_resume(struct usb_hcd *hcd)
+{
+	struct r8a66597 *r8a66597 = hcd_to_r8a66597(hcd);
+	int port;
+
+	dbg("%s", __func__);
+
+	for (port = 0; port < R8A66597_MAX_ROOT_HUB; port++) {
+		struct r8a66597_root_hub *rh = &r8a66597->root_hub[port];
+		unsigned long dvstctr_reg = get_dvstctr_reg(port);
+
+		if (!(rh->port & (1 << USB_PORT_FEAT_SUSPEND)))
+			continue;
+
+		dbg("resume port = %d", port);
+		rh->port &= ~(1 << USB_PORT_FEAT_SUSPEND);
+		rh->port |= 1 << USB_PORT_FEAT_C_SUSPEND;
+		r8a66597_mdfy(r8a66597, RESUME, RESUME | UACT, dvstctr_reg);
+		msleep(50);
+		r8a66597_mdfy(r8a66597, UACT, RESUME | UACT, dvstctr_reg);
+	}
+
+	return 0;
+
+}
+#else
+#define	r8a66597_bus_suspend	NULL
+#define	r8a66597_bus_resume	NULL
+#endif
+
 static struct hc_driver r8a66597_hc_driver = {
 	.description =		hcd_name,
 	.hcd_priv_size =	sizeof(struct r8a66597),
@@ -2242,16 +2318,39 @@ static struct hc_driver r8a66597_hc_driver = {
 	 */
 	.hub_status_data =	r8a66597_hub_status_data,
 	.hub_control =		r8a66597_hub_control,
+	.bus_suspend =		r8a66597_bus_suspend,
+	.bus_resume =		r8a66597_bus_resume,
 };
 
 #if defined(CONFIG_PM)
 static int r8a66597_suspend(struct platform_device *pdev, pm_message_t state)
 {
+	struct r8a66597		*r8a66597 = dev_get_drvdata(&pdev->dev);
+	int port;
+
+	dbg("%s", __func__);
+
+	disable_controller(r8a66597);
+
+	for (port = 0; port < R8A66597_MAX_ROOT_HUB; port++) {
+		struct r8a66597_root_hub *rh = &r8a66597->root_hub[port];
+
+		rh->port = 0x00000000;
+	}
+
 	return 0;
 }
 
 static int r8a66597_resume(struct platform_device *pdev)
 {
+	struct r8a66597		*r8a66597 = dev_get_drvdata(&pdev->dev);
+	struct usb_hcd		*hcd = r8a66597_to_hcd(r8a66597);
+
+	dbg("%s", __func__);
+
+	enable_controller(r8a66597);
+	usb_root_hub_lost_power(hcd->self.root_hub);
+
 	return 0;
 }
 #else	/* if defined(CONFIG_PM) */
diff --git a/drivers/usb/host/r8a66597.h b/drivers/usb/host/r8a66597.h
index ecacde4..f49208f 100644
--- a/drivers/usb/host/r8a66597.h
+++ b/drivers/usb/host/r8a66597.h
@@ -504,6 +504,8 @@ struct r8a66597 {
 
 	struct list_head child_device;
 	unsigned long child_connect_map[4];
+
+	unsigned bus_suspended:1;
 };
 
 static inline struct r8a66597 *hcd_to_r8a66597(struct usb_hcd *hcd)