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Subject[PATCH] usb: dwc2: add support for host mode external vbus supply
Date
This patch adds a way to enable an external vbus supply in host mode,
when dwc2 drvvbus signal is not used.

This patch is very similar to the one done in U-Boot dwc2 driver [1]. It
also adds dynamic vbus supply management depending on the role and state
of the core.

[1] https://lists.denx.de/pipermail/u-boot/2017-March/283434.html

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
drivers/usb/dwc2/core.h | 2 ++
drivers/usb/dwc2/hcd.c | 26 ++++++++++++++++++++++++++
2 files changed, 28 insertions(+)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index cd77af3..8ebc85c 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -786,6 +786,7 @@ struct dwc2_hregs_backup {
* @plat: The platform specific configuration data. This can be
* removed once all SoCs support usb transceiver.
* @supplies: Definition of USB power supplies
+ * @vbus_supply: Regulator supplying vbus.
* @phyif: PHY interface width
* @lock: Spinlock that protects all the driver data structures
* @priv: Stores a pointer to the struct usb_hcd
@@ -922,6 +923,7 @@ struct dwc2_hsotg {
struct usb_phy *uphy;
struct dwc2_hsotg_plat *plat;
struct regulator_bulk_data supplies[DWC2_NUM_SUPPLIES];
+ struct regulator *vbus_supply;
u32 phyif;

spinlock_t lock;
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index a5d72fc..2cf2fd0 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -365,6 +365,23 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
}

+static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
+{
+ hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
+ if (IS_ERR(hsotg->vbus_supply))
+ return 0;
+
+ return regulator_enable(hsotg->vbus_supply);
+}
+
+static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
+{
+ if (hsotg->vbus_supply)
+ return regulator_disable(hsotg->vbus_supply);
+
+ return 0;
+}
+
/**
* dwc2_enable_host_interrupts() - Enables the Host mode interrupts
*
@@ -3257,6 +3274,7 @@ static void dwc2_conn_id_status_change(struct work_struct *work)

/* B-Device connector (Device Mode) */
if (gotgctl & GOTGCTL_CONID_B) {
+ dwc2_vbus_supply_exit(hsotg);
/* Wait for switch to device mode */
dev_dbg(hsotg->dev, "connId B\n");
if (hsotg->bus_suspended) {
@@ -4363,6 +4381,9 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd)
}

spin_unlock_irqrestore(&hsotg->lock, flags);
+
+ dwc2_vbus_supply_init(hsotg);
+
return 0;
}

@@ -4390,6 +4411,8 @@ static void _dwc2_hcd_stop(struct usb_hcd *hcd)
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
spin_unlock_irqrestore(&hsotg->lock, flags);

+ dwc2_vbus_supply_exit(hsotg);
+
usleep_range(1000, 3000);
}

@@ -4426,6 +4449,7 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
hprt0 |= HPRT0_SUSP;
hprt0 &= ~HPRT0_PWR;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
+ dwc2_vbus_supply_exit(hsotg);
}

/* Enter hibernation */
@@ -4506,6 +4530,8 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_port_resume(hsotg);
} else {
+ dwc2_vbus_supply_init(hsotg);
+
/* Wait for controller to correctly update D+/D- level */
usleep_range(3000, 5000);

--
2.7.4
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