usb: dwc3: Don't reinitialize core during host bus-suspend/resume

Driver powers-off PHYs and reinitializes DWC3 core and gadget on
resume. While this works fine for gadget mode but in host
mode there is not re-initialization of host stack. Also, resetting
bus as part of bus_suspend/resume is not correct which could affect
(or disconnect) connected devices.
Fix this by not reinitializing core on suspend/resume in host mode
for HOST only and OTG/drd configurations.

Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 03474d3..f75613f 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -927,6 +927,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 
        switch (dwc->dr_mode) {
        case USB_DR_MODE_PERIPHERAL:
+               dwc->current_dr_role = DWC3_GCTL_PRTCAP_DEVICE;
                dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 
                if (dwc->usb2_phy)
@@ -942,6 +943,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
                }
                break;
        case USB_DR_MODE_HOST:
+               dwc->current_dr_role = DWC3_GCTL_PRTCAP_HOST;
                dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
 
                if (dwc->usb2_phy)
@@ -1293,21 +1295,19 @@ static int dwc3_suspend_common(struct dwc3 *dwc)
 {
        unsigned long   flags;
 
-       switch (dwc->dr_mode) {
-       case USB_DR_MODE_PERIPHERAL:
-       case USB_DR_MODE_OTG:
+       switch (dwc->current_dr_role) {
+       case DWC3_GCTL_PRTCAP_DEVICE:
                spin_lock_irqsave(&dwc->lock, flags);
                dwc3_gadget_suspend(dwc);
                spin_unlock_irqrestore(&dwc->lock, flags);
+               dwc3_core_exit(dwc);
                break;
-       case USB_DR_MODE_HOST:
+       case DWC3_GCTL_PRTCAP_HOST:
        default:
                /* do nothing */
                break;
        }
 
-       dwc3_core_exit(dwc);
-
        return 0;
 }
 
@@ -1316,18 +1316,17 @@ static int dwc3_resume_common(struct dwc3 *dwc)
        unsigned long   flags;
        int             ret;
 
-       ret = dwc3_core_init(dwc);
-       if (ret)
-               return ret;
+       switch (dwc->current_dr_role) {
+       case DWC3_GCTL_PRTCAP_DEVICE:
+               ret = dwc3_core_init(dwc);
+               if (ret)
+                       return ret;
 
-       switch (dwc->dr_mode) {
-       case USB_DR_MODE_PERIPHERAL:
-       case USB_DR_MODE_OTG:
                spin_lock_irqsave(&dwc->lock, flags);
                dwc3_gadget_resume(dwc);
                spin_unlock_irqrestore(&dwc->lock, flags);
-               /* FALLTHROUGH */
-       case USB_DR_MODE_HOST:
+               break;
+       case DWC3_GCTL_PRTCAP_HOST:
        default:
                /* do nothing */
                break;
@@ -1338,7 +1337,7 @@ static int dwc3_resume_common(struct dwc3 *dwc)
 
 static int dwc3_runtime_checks(struct dwc3 *dwc)
 {
-       switch (dwc->dr_mode) {
+       switch (dwc->current_dr_role) {
        case USB_DR_MODE_PERIPHERAL:
        case USB_DR_MODE_OTG:
                if (dwc->connected)
@@ -1381,12 +1380,11 @@ static int dwc3_runtime_resume(struct device *dev)
        if (ret)
                return ret;
 
-       switch (dwc->dr_mode) {
-       case USB_DR_MODE_PERIPHERAL:
-       case USB_DR_MODE_OTG:
+       switch (dwc->current_dr_role) {
+       case DWC3_GCTL_PRTCAP_DEVICE:
                dwc3_gadget_process_pending_events(dwc);
                break;
-       case USB_DR_MODE_HOST:
+       case DWC3_GCTL_PRTCAP_HOST:
        default:
                /* do nothing */
                break;
@@ -1402,13 +1400,12 @@ static int dwc3_runtime_idle(struct device *dev)
 {
        struct dwc3     *dwc = dev_get_drvdata(dev);
 
-       switch (dwc->dr_mode) {
-       case USB_DR_MODE_PERIPHERAL:
-       case USB_DR_MODE_OTG:
+       switch (dwc->current_dr_role) {
+       case DWC3_GCTL_PRTCAP_DEVICE:
                if (dwc3_runtime_checks(dwc))
                        return -EBUSY;
                break;
-       case USB_DR_MODE_HOST:
+       case DWC3_GCTL_PRTCAP_HOST:
        default:
                /* do nothing */
                break;