When we need the PHY can be waken up by external signals,
we can call this API. Besides, we call mxs_phy_disconnect_line
at this API to close the connection between USB PHY and
controller, after that, the line state from controller is SE0.
Once the PHY is out of power, without calling mxs_phy_disconnect_line,
there are unknown wakeups due to dp/dm floating at device mode.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/phy/phy-mxs-usb.c | 79 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 79 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 0908d74..84680e3 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -31,6 +31,9 @@
#define HW_USBPHY_CTRL_SET 0x34
#define HW_USBPHY_CTRL_CLR 0x38
+#define HW_USBPHY_DEBUG_SET 0x54
+#define HW_USBPHY_DEBUG_CLR 0x58
+
#define HW_USBPHY_IP 0x90
#define HW_USBPHY_IP_SET 0x94
#define HW_USBPHY_IP_CLR 0x98
@@ -39,6 +42,9 @@
#define BM_USBPHY_CTRL_CLKGATE BIT(30)
#define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS BIT(26)
#define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE BIT(25)
+#define BM_USBPHY_CTRL_ENVBUSCHG_WKUP BIT(23)
+#define BM_USBPHY_CTRL_ENIDCHG_WKUP BIT(22)
+#define BM_USBPHY_CTRL_ENDPDMCHG_WKUP BIT(21)
#define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD BIT(20)
#define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE BIT(19)
#define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL BIT(18)
@@ -48,6 +54,19 @@
#define BM_USBPHY_IP_FIX (BIT(17) | BIT(18))
+#define BM_USBPHY_DEBUG_CLKGATE BIT(30)
+
+/* Anatop Registers */
+#define ANADIG_USB1_VBUS_DET_STAT 0x1c0
+
+#define ANADIG_USB1_LOOPBACK_SET 0x1e4
+#define ANADIG_USB1_LOOPBACK_CLR 0x1e8
+
+#define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
+
+#define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 BIT(2)
+#define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN BIT(5)
+
#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
/* Do disconnection between PHY and controller without vbus */
@@ -146,6 +165,48 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
return 0;
}
+static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
+{
+ void __iomem *base = mxs_phy->phy.io_priv;
+ bool vbus_is_on = false;
+ static bool line_is_disconnected;
+ unsigned int vbus_value = 0;
+
+ /* If the SoCs don't need to disconnect line without vbus, quit */
+ if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
+ return;
+
+ /* If the SoCs don't have anatop, quit */
+ if (!mxs_phy->regmap_anatop)
+ return;
+
+ regmap_read(mxs_phy->regmap_anatop, ANADIG_USB1_VBUS_DET_STAT,
+ &vbus_value);
+ if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)
+ vbus_is_on = true;
+
+ if (on && !vbus_is_on) {
+ writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
+ base + HW_USBPHY_DEBUG_CLR);
+ regmap_write(mxs_phy->regmap_anatop, ANADIG_USB1_LOOPBACK_SET,
+ BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 |
+ BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
+ /* Delay some time, and let Linestate be SE0 for controller */
+ usleep_range(500, 1000);
+ line_is_disconnected = true;
+ } else if (line_is_disconnected) {
+ regmap_write(mxs_phy->regmap_anatop, ANADIG_USB1_LOOPBACK_CLR,
+ BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 |
+ BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
+ writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
+ base + HW_USBPHY_DEBUG_SET);
+ line_is_disconnected = false;
+ }
+
+ dev_dbg(mxs_phy->phy.dev, "line is %s\n", line_is_disconnected
+ ? "disconnected" : "connected");
+}
+
static int mxs_phy_init(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
@@ -183,6 +244,23 @@ static int mxs_phy_suspend(struct usb_phy *x, int suspend)
return 0;
}
+static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled)
+{
+ struct mxs_phy *mxs_phy = to_mxs_phy(x);
+ u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
+ BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
+ BM_USBPHY_CTRL_ENIDCHG_WKUP;
+ if (enabled) {
+ mxs_phy_disconnect_line(mxs_phy, true);
+ writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET);
+ } else {
+ writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR);
+ mxs_phy_disconnect_line(mxs_phy, false);
+ }
+
+ return 0;
+}
+
static int mxs_phy_on_connect(struct usb_phy *phy,
enum usb_device_speed speed)
{
@@ -289,6 +367,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
mxs_phy->phy.notify_connect = mxs_phy_on_connect;
mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
mxs_phy->phy.type = USB_PHY_TYPE_USB2;
+ mxs_phy->phy.set_wakeup = mxs_phy_set_wakeup;
ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
--
1.7.8
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