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@xxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
