From 0e9e8d832321ba7b99f9f7b6152245c542153cbd Mon Sep 17 00:00:00 2001 From: Mathias Kresin Date: Sun, 22 Apr 2018 16:55:02 +0200 Subject: kernel: dwc2: add support for host mode external vbus supply Backport patch adding support for the vbus-supply devicetree property, which allows to specific GPIOs (via fixed regulators) to enable vbus/usb power. Signed-off-by: Mathias Kresin --- ...d-support-for-host-mode-external-vbus-sup.patch | 109 +++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 target/linux/generic/backport-4.14/030-v4.17-0001-usb-dwc2-add-support-for-host-mode-external-vbus-sup.patch (limited to 'target/linux/generic/backport-4.14/030-v4.17-0001-usb-dwc2-add-support-for-host-mode-external-vbus-sup.patch') diff --git a/target/linux/generic/backport-4.14/030-v4.17-0001-usb-dwc2-add-support-for-host-mode-external-vbus-sup.patch b/target/linux/generic/backport-4.14/030-v4.17-0001-usb-dwc2-add-support-for-host-mode-external-vbus-sup.patch new file mode 100644 index 0000000000..f490639f39 --- /dev/null +++ b/target/linux/generic/backport-4.14/030-v4.17-0001-usb-dwc2-add-support-for-host-mode-external-vbus-sup.patch @@ -0,0 +1,109 @@ +From 531ef5ebea96394ddb7f554d4d88e017dde30a59 Mon Sep 17 00:00:00 2001 +From: Amelie Delaunay +Date: Tue, 13 Feb 2018 09:28:12 +0100 +Subject: [PATCH] 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 +Signed-off-by: Felipe Balbi +--- + drivers/usb/dwc2/core.h | 2 ++ + drivers/usb/dwc2/hcd.c | 26 ++++++++++++++++++++++++++ + 2 files changed, 28 insertions(+) + +--- a/drivers/usb/dwc2/core.h ++++ b/drivers/usb/dwc2/core.h +@@ -777,6 +777,7 @@ 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 +@@ -913,6 +914,7 @@ 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; +--- a/drivers/usb/dwc2/hcd.c ++++ b/drivers/usb/dwc2/hcd.c +@@ -359,6 +359,23 @@ static void dwc2_gusbcfg_init(struct dwc + 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 + * +@@ -3246,6 +3263,7 @@ static void dwc2_conn_id_status_change(s + + /* 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) { +@@ -4352,6 +4370,9 @@ static int _dwc2_hcd_start(struct usb_hc + } + + spin_unlock_irqrestore(&hsotg->lock, flags); ++ ++ dwc2_vbus_supply_init(hsotg); ++ + return 0; + } + +@@ -4379,6 +4400,8 @@ static void _dwc2_hcd_stop(struct usb_hc + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + spin_unlock_irqrestore(&hsotg->lock, flags); + ++ dwc2_vbus_supply_exit(hsotg); ++ + usleep_range(1000, 3000); + } + +@@ -4415,6 +4438,7 @@ static int _dwc2_hcd_suspend(struct usb_ + hprt0 |= HPRT0_SUSP; + hprt0 &= ~HPRT0_PWR; + dwc2_writel(hprt0, hsotg->regs + HPRT0); ++ dwc2_vbus_supply_exit(hsotg); + } + + /* Enter hibernation */ +@@ -4495,6 +4519,8 @@ static int _dwc2_hcd_resume(struct usb_h + 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); + -- cgit v1.2.3