linux-kernel - [PATCH 3/4] usb: dwc3: core: Move the mode setting to the right place

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Date:	Fri, 15 Jul 2016 17:13:27 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	balbi@...nel.org, gregkh@...uxfoundation.org
Cc:	mathias.nyman@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, broonie@...nel.org,
	baolin.wang@...aro.org
Subject: [PATCH 3/4] usb: dwc3: core: Move the mode setting to the right place

When dwc3 core enters into suspend mode, the system (especially for mobile
device) may power off the dwc3 controller for power saving, that will cause
dwc3 controller lost the mode operation when resuming dwc3 core.

Thus we can move the mode setting into dwc3_core_init() function to avoid this
issue.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/usb/dwc3/core.c |   18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9466431..1485480 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -666,6 +666,21 @@ static int dwc3_core_init(struct dwc3 *dwc)
 		goto err4;
 	}
 
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
+		break;
+	case USB_DR_MODE_HOST:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
+		break;
+	case USB_DR_MODE_OTG:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
+		break;
+	default:
+		dev_warn(dwc->dev, "Unsupported mode %d\n", dwc->dr_mode);
+		break;
+	}
+
 	return 0;
 
 err4:
@@ -763,7 +778,6 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 
 	switch (dwc->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 		ret = dwc3_gadget_init(dwc);
 		if (ret) {
 			if (ret != -EPROBE_DEFER)
@@ -772,7 +786,6 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 		}
 		break;
 	case USB_DR_MODE_HOST:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
 		ret = dwc3_host_init(dwc);
 		if (ret) {
 			if (ret != -EPROBE_DEFER)
@@ -781,7 +794,6 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 		}
 		break;
 	case USB_DR_MODE_OTG:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
 		ret = dwc3_host_init(dwc);
 		if (ret) {
 			if (ret != -EPROBE_DEFER)
-- 
1.7.9.5