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usb: dwc2: add support for host mode external vbus supply 

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>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Amelie Delaunay 2018-02-13 09:28:12 +01:00 committed by Felipe Balbi
parent 13b1f8e25b
commit 531ef5ebea
2 changed files with 28 additions and 0 deletions
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2
drivers/usb/dwc2/core.h
View File

@ -819,6 +819,7 @@ 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
@ -958,6 +959,7 @@ 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;

26
drivers/usb/dwc2/hcd.c
View File

@ -356,6 +356,23 @@ 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
*
@ -3275,6 +3292,7 @@ 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) {
@ -4323,6 +4341,9 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd)
}
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_vbus_supply_init(hsotg);
return 0;
}
@ -4350,6 +4371,8 @@ 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);
}
@ -4386,6 +4409,7 @@ 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 partial_power_down */
@ -4466,6 +4490,8 @@ 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);