VBUS is not routed to USB PHY on recent Qualcomm platforms. USB controller
must see VBUS in order to pull-up DP when setting RS bit. Henc configure
USB PHY and LINK registers sense VBUS and enable manual pullup on D+ line.
Cc: Vamsi Krishna <vskri...@codeaurora.org>
Cc: Mayank Rana <mr...@codeaurora.org>
Signed-off-by: Ivan T. Ivanov <ivan.iva...@linaro.org>
---
.../devicetree/bindings/usb/msm-hsusb.txt | 4 ++++
drivers/usb/phy/phy-msm-usb.c | 26 ++++++++++++++++++++++
include/linux/usb/msm_hsusb.h | 5 +++++
include/linux/usb/msm_hsusb_hw.h | 9 ++++++++
4 files changed, 44 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/msm-hsusb.txt
b/Documentation/devicetree/bindings/usb/msm-hsusb.txt
index f26bcfa..bd8d9e7 100644
--- a/Documentation/devicetree/bindings/usb/msm-hsusb.txt
+++ b/Documentation/devicetree/bindings/usb/msm-hsusb.txt
@@ -69,6 +69,10 @@ Optional properties:
(no, min, max) where each value represents either a voltage
in microvolts or a value corresponding to voltage corner.
+- qcom,manual-pullup: If present, vbus is not routed to USB controller/phy
+ and controller driver therefore enables pull-up explicitly
+ before starting controller using usbcmd run/stop bit.
+
- extcon: phandles to external connector devices. First phandle
should point to external connector, which provide "USB"
cable events, the second should point to external connector
diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index d47c3eb..4a928f7 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -245,8 +245,14 @@ static void ulpi_init(struct msm_otg *motg)
static int msm_phy_notify_disconnect(struct usb_phy *phy,
enum usb_device_speed speed)
{
+ struct msm_otg *motg = container_of(phy, struct msm_otg, phy);
int val;
+ if (motg->manual_pullup) {
+ val = ULPI_MISC_A_VBUSVLDEXT | ULPI_MISC_A_VBUSVLDEXTSEL;
+ usb_phy_io_write(phy, val, ULPI_CLR(ULPI_MISC_A));
+ }
+
/*
* Put the transceiver in non-driving mode. Otherwise host
* may not detect soft-disconnection.
@@ -431,6 +437,24 @@ static int msm_phy_init(struct usb_phy *phy)
ulpi_write(phy, ulpi_val, ULPI_USB_INT_EN_FALL);
}
+ if (motg->manual_pullup) {
+ val = ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT;
+ ulpi_write(phy, val, ULPI_SET(ULPI_MISC_A));
+
+ val = readl(USB_GENCONFIG_2);
+ val |= GENCONFIG_2_SESS_VLD_CTRL_EN;
+ writel(val, USB_GENCONFIG_2);
+
+ val = readl(USB_USBCMD);
+ val |= USBCMD_SESS_VLD_CTRL;
+ writel(val, USB_USBCMD);
+
+ val = ulpi_read(phy, ULPI_FUNC_CTRL);
+ val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
+ val |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
+ ulpi_write(phy, val, ULPI_FUNC_CTRL);
+ }
+
if (motg->phy_number)
writel(readl(USB_PHY_CTRL2) | BIT(16), USB_PHY_CTRL2);
@@ -1529,6 +1553,8 @@ static int msm_otg_read_dt(struct platform_device *pdev,
struct msm_otg *motg)
motg->vdd_levels[VDD_LEVEL_MAX] = tmp[VDD_LEVEL_MAX];
}
+ motg->manual_pullup = of_property_read_bool(node, "qcom,manual-pullup");
+
ext_id = ERR_PTR(-ENODEV);
ext_vbus = ERR_PTR(-ENODEV);
if (of_property_read_bool(node, "extcon")) {
diff --git a/include/linux/usb/msm_hsusb.h b/include/linux/usb/msm_hsusb.h
index 9a38e77..a5edc8d 100644
--- a/include/linux/usb/msm_hsusb.h
+++ b/include/linux/usb/msm_hsusb.h
@@ -153,6 +153,9 @@ struct msm_usb_cable {
* @chg_type: The type of charger attached.
* @dcd_retires: The retry count used to track Data contact
* detection process.
+ * @manual_pullup: true if VBUS is not routed to USB controller/phy
+ * and controller driver therefore enables pull-up explicitly before
+ * starting controller using usbcmd run/stop bit.
* @vbus: VBUS signal state trakining, using extcon framework
* @id: ID signal state trakining, using extcon framework
*/
@@ -185,6 +188,8 @@ struct msm_otg {
struct reset_control *link_rst;
int vdd_levels[3];
+ bool manual_pullup;
+
struct msm_usb_cable vbus;
struct msm_usb_cable id;
};
diff --git a/include/linux/usb/msm_hsusb_hw.h b/include/linux/usb/msm_hsusb_hw.h
index a29f603..e159b39 100644
--- a/include/linux/usb/msm_hsusb_hw.h
+++ b/include/linux/usb/msm_hsusb_hw.h
@@ -21,6 +21,8 @@
#define USB_AHBBURST (MSM_USB_BASE + 0x0090)
#define USB_AHBMODE (MSM_USB_BASE + 0x0098)
+#define USB_GENCONFIG_2 (MSM_USB_BASE + 0x00a0)
+
#define USB_CAPLENGTH (MSM_USB_BASE + 0x0100) /* 8 bit */
#define USB_USBCMD (MSM_USB_BASE + 0x0140)
@@ -30,6 +32,9 @@
#define USB_PHY_CTRL (MSM_USB_BASE + 0x0240)
#define USB_PHY_CTRL2 (MSM_USB_BASE + 0x0278)
+#define GENCONFIG_2_SESS_VLD_CTRL_EN BIT(7)
+#define USBCMD_SESS_VLD_CTRL BIT(25)
+
#define USBCMD_RESET 2
#define USB_USBINTR (MSM_USB_BASE + 0x0148)
@@ -50,6 +55,10 @@
#define ULPI_PWR_CLK_MNG_REG 0x88
#define OTG_COMP_DISABLE BIT(0)
+#define ULPI_MISC_A 0x96
+#define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1)
+#define ULPI_MISC_A_VBUSVLDEXT BIT(0)
+
#define ASYNC_INTR_CTRL (1 << 29) /* Enable async interrupt */
#define ULPI_STP_CTRL (1 << 30) /* Block communication with PHY */
#define PHY_RETEN (1 << 1) /* PHY retention enable/disable */
--
1.9.1
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