linux-kernel - [PATCH v4 9/9] usb: dwc3: Add host-mode as default support

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Message-Id: <20191028215919.83697-10-john.stultz@linaro.org>
Date:   Mon, 28 Oct 2019 21:59:19 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        ShuFan Lee <shufan_lee@...htek.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Yu Chen <chenyu56@...wei.com>, Felipe Balbi <balbi@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jun Li <lijun.kernel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Jack Pham <jackp@...eaurora.org>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v4 9/9] usb: dwc3: Add host-mode as default support

Support configuring the default role the controller assumes as
host mode when the usb role is USB_ROLE_NONE

This patch was split out from a larger patch originally by
Yu Chen <chenyu56@...wei.com>

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
CC: ShuFan Lee <shufan_lee@...htek.com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc: Yu Chen <chenyu56@...wei.com>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Jun Li <lijun.kernel@...il.com>
Cc: Valentin Schneider <valentin.schneider@....com>
Cc: Jack Pham <jackp@...eaurora.org>
Cc: linux-usb@...r.kernel.org
Cc: devicetree@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v3: Split this patch out from addition of usb-role-switch
    handling
---
 drivers/usb/dwc3/core.h |  3 +++
 drivers/usb/dwc3/drd.c  | 20 ++++++++++++++++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 6f19e9891767..3c879c9ab1aa 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -953,6 +953,8 @@ struct dwc3_scratchpad_array {
  *		- USBPHY_INTERFACE_MODE_UTMI
  *		- USBPHY_INTERFACE_MODE_UTMIW
  * @role_sw: usb_role_switch handle
+ * @role_switch_default_mode: default operation mode of controller while
+ *			usb role is USB_ROLE_NONE.
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @usb2_generic_phy: pointer to USB2 PHY
@@ -1087,6 +1089,7 @@ struct dwc3 {
 	struct notifier_block	edev_nb;
 	enum usb_phy_interface	hsphy_mode;
 	struct usb_role_switch	*role_sw;
+	enum usb_dr_mode	role_switch_default_mode;
 
 	u32			fladj;
 	u32			irq_gadget;
diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index 61d4fd8aead4..0e3466fe5ac4 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -489,7 +489,10 @@ static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
 		mode = DWC3_GCTL_PRTCAP_DEVICE;
 		break;
 	default:
-		mode = DWC3_GCTL_PRTCAP_DEVICE;
+		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
+			mode = DWC3_GCTL_PRTCAP_HOST;
+		else
+			mode = DWC3_GCTL_PRTCAP_DEVICE;
 		break;
 	}
 
@@ -515,7 +518,10 @@ static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
 		role = dwc->current_otg_role;
 		break;
 	default:
-		role = USB_ROLE_DEVICE;
+		if (dwc->role_switch_default_mode == USB_DR_MODE_HOST)
+			role = USB_ROLE_HOST;
+		else
+			role = USB_ROLE_DEVICE;
 		break;
 	}
 	spin_unlock_irqrestore(&dwc->lock, flags);
@@ -534,8 +540,14 @@ int dwc3_drd_init(struct dwc3 *dwc)
 		struct usb_role_switch_desc dwc3_role_switch = {NULL};
 		u32 mode;
 
-		mode = DWC3_GCTL_PRTCAP_DEVICE;
-
+		if (device_property_read_bool(dwc->dev,
+					      "role-switch-default-host")) {
+			dwc->role_switch_default_mode = USB_DR_MODE_HOST;
+			mode = DWC3_GCTL_PRTCAP_HOST;
+		} else {
+			dwc->role_switch_default_mode = USB_DR_MODE_PERIPHERAL;
+			mode = DWC3_GCTL_PRTCAP_DEVICE;
+		}
 		dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
 		dwc3_role_switch.set = dwc3_usb_role_switch_set;
 		dwc3_role_switch.get = dwc3_usb_role_switch_get;
-- 
2.17.1