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110 lines
3.3 KiB
Diff
110 lines
3.3 KiB
Diff
From 531ef5ebea96394ddb7f554d4d88e017dde30a59 Mon Sep 17 00:00:00 2001
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From: Amelie Delaunay <amelie.delaunay@st.com>
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Date: Tue, 13 Feb 2018 09:28:12 +0100
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Subject: [PATCH] usb: dwc2: add support for host mode external vbus supply
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This patch adds a way to enable an external vbus supply in host mode,
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when dwc2 drvvbus signal is not used.
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This patch is very similar to the one done in U-Boot dwc2 driver [1]. It
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also adds dynamic vbus supply management depending on the role and state
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of the core.
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[1] https://lists.denx.de/pipermail/u-boot/2017-March/283434.html
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Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
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Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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---
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drivers/usb/dwc2/core.h | 2 ++
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drivers/usb/dwc2/hcd.c | 26 ++++++++++++++++++++++++++
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2 files changed, 28 insertions(+)
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--- a/drivers/usb/dwc2/core.h
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+++ b/drivers/usb/dwc2/core.h
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@@ -777,6 +777,7 @@ struct dwc2_hregs_backup {
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* @plat: The platform specific configuration data. This can be
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* removed once all SoCs support usb transceiver.
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* @supplies: Definition of USB power supplies
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+ * @vbus_supply: Regulator supplying vbus.
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* @phyif: PHY interface width
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* @lock: Spinlock that protects all the driver data structures
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* @priv: Stores a pointer to the struct usb_hcd
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@@ -914,6 +915,7 @@ struct dwc2_hsotg {
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struct usb_phy *uphy;
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struct dwc2_hsotg_plat *plat;
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struct regulator_bulk_data supplies[DWC2_NUM_SUPPLIES];
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+ struct regulator *vbus_supply;
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u32 phyif;
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spinlock_t lock;
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--- a/drivers/usb/dwc2/hcd.c
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+++ b/drivers/usb/dwc2/hcd.c
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@@ -359,6 +359,23 @@ static void dwc2_gusbcfg_init(struct dwc
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dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
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}
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+static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
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+{
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+ hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
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+ if (IS_ERR(hsotg->vbus_supply))
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+ return 0;
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+
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+ return regulator_enable(hsotg->vbus_supply);
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+}
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+
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+static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
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+{
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+ if (hsotg->vbus_supply)
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+ return regulator_disable(hsotg->vbus_supply);
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+
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+ return 0;
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+}
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+
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/**
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* dwc2_enable_host_interrupts() - Enables the Host mode interrupts
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*
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@@ -3346,6 +3363,7 @@ static void dwc2_conn_id_status_change(s
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/* B-Device connector (Device Mode) */
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if (gotgctl & GOTGCTL_CONID_B) {
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+ dwc2_vbus_supply_exit(hsotg);
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/* Wait for switch to device mode */
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dev_dbg(hsotg->dev, "connId B\n");
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if (hsotg->bus_suspended) {
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@@ -4455,6 +4473,9 @@ static int _dwc2_hcd_start(struct usb_hc
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}
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spin_unlock_irqrestore(&hsotg->lock, flags);
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+
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+ dwc2_vbus_supply_init(hsotg);
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+
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return 0;
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}
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@@ -4482,6 +4503,8 @@ static void _dwc2_hcd_stop(struct usb_hc
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clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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spin_unlock_irqrestore(&hsotg->lock, flags);
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+ dwc2_vbus_supply_exit(hsotg);
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+
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usleep_range(1000, 3000);
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}
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@@ -4518,6 +4541,7 @@ static int _dwc2_hcd_suspend(struct usb_
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hprt0 |= HPRT0_SUSP;
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hprt0 &= ~HPRT0_PWR;
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dwc2_writel(hprt0, hsotg->regs + HPRT0);
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+ dwc2_vbus_supply_exit(hsotg);
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}
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/* Enter hibernation */
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@@ -4598,6 +4622,8 @@ static int _dwc2_hcd_resume(struct usb_h
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spin_unlock_irqrestore(&hsotg->lock, flags);
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dwc2_port_resume(hsotg);
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} else {
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+ dwc2_vbus_supply_init(hsotg);
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+
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/* Wait for controller to correctly update D+/D- level */
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usleep_range(3000, 5000);
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