usb: phy: phy-am335x: bypass first VBUS sensing for host-only mode
To prevent VBUS contention, the am335x MUSB phy senses VBUS first before transitioning to host mode. However, for host-only mode, VBUS could be directly tied to 5V power rail which could prevent MUSB transitions to host mode. This change receives dr_mode of the controller then bypass the first VBUS sensing for host-only mode, so that MUSB can work in host mode event if VBUS is tied to 5V. Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
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@ -66,6 +66,7 @@ config AM335X_PHY_USB
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select USB_PHY
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select AM335X_CONTROL_USB
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select NOP_USB_XCEIV
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select USB_COMMON
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help
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This driver provides PHY support for that phy which part for the
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AM335x SoC.
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@ -4,6 +4,7 @@
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#include <linux/of.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/usb/otg.h>
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#include "phy-am335x-control.h"
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struct am335x_control_usb {
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@ -58,7 +59,8 @@ static void am335x_phy_wkup(struct phy_control *phy_ctrl, u32 id, bool on)
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spin_unlock(&usb_ctrl->lock);
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}
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static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
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static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
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enum usb_dr_mode dr_mode, bool on)
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{
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struct am335x_control_usb *usb_ctrl;
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u32 val;
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@ -80,8 +82,14 @@ static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
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val = readl(usb_ctrl->phy_reg + reg);
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if (on) {
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if (dr_mode == USB_DR_MODE_HOST) {
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val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
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USBPHY_OTGVDET_EN);
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val |= USBPHY_OTGSESSEND_EN;
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} else {
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val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
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val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
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}
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} else {
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val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
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}
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@ -2,13 +2,15 @@
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#define _AM335x_PHY_CONTROL_H_
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struct phy_control {
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void (*phy_power)(struct phy_control *phy_ctrl, u32 id, bool on);
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void (*phy_power)(struct phy_control *phy_ctrl, u32 id,
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enum usb_dr_mode dr_mode, bool on);
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void (*phy_wkup)(struct phy_control *phy_ctrl, u32 id, bool on);
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};
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static inline void phy_ctrl_power(struct phy_control *phy_ctrl, u32 id, bool on)
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static inline void phy_ctrl_power(struct phy_control *phy_ctrl, u32 id,
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enum usb_dr_mode dr_mode, bool on)
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{
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phy_ctrl->phy_power(phy_ctrl, id, on);
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phy_ctrl->phy_power(phy_ctrl, id, dr_mode, on);
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}
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static inline void phy_ctrl_wkup(struct phy_control *phy_ctrl, u32 id, bool on)
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@ -8,6 +8,7 @@
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#include <linux/regulator/consumer.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/usb/of.h>
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#include "phy-am335x-control.h"
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#include "phy-generic.h"
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@ -16,13 +17,14 @@ struct am335x_phy {
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struct usb_phy_generic usb_phy_gen;
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struct phy_control *phy_ctrl;
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int id;
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enum usb_dr_mode dr_mode;
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};
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static int am335x_init(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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return 0;
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}
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@ -30,7 +32,7 @@ static void am335x_shutdown(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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}
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static int am335x_phy_probe(struct platform_device *pdev)
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@ -46,12 +48,15 @@ static int am335x_phy_probe(struct platform_device *pdev)
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am_phy->phy_ctrl = am335x_get_phy_control(dev);
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if (!am_phy->phy_ctrl)
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return -EPROBE_DEFER;
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am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
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if (am_phy->id < 0) {
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dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
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return am_phy->id;
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}
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am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node);
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ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
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if (ret)
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return ret;
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@ -75,7 +80,7 @@ static int am335x_phy_probe(struct platform_device *pdev)
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*/
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device_set_wakeup_enable(dev, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return 0;
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}
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@ -105,7 +110,7 @@ static int am335x_phy_suspend(struct device *dev)
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return 0;
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}
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@ -115,7 +120,7 @@ static int am335x_phy_resume(struct device *dev)
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struct platform_device *pdev = to_platform_device(dev);
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struct am335x_phy *am_phy = platform_get_drvdata(pdev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
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