usb: phy: twl4030-usb: check if vbus is driven by twl itself

At least on pandora, STS_VBUS gets set even when VBUS is driven by twl
itself. Reporting VBUS in this case confuses OMAP musb glue and charger
driver, so check if OTG VBUS charge pump is on before reporting VBUS
event to avoid this problem.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 28 insertions, 3 deletions

diff --git a/drivers/usb/phy/phy-twl4030-usb.c b/drivers/usb/phy/phy-twl4030-usb.c
index 61fe7e29c9c3..3f9858fbebc2 100644
--- a/drivers/usb/phy/phy-twl4030-usb.c
+++ b/drivers/usb/phy/phy-twl4030-usb.c
@@ -248,6 +248,25 @@ twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 
 /*-------------------------------------------------------------------------*/
 
+static bool twl4030_is_driving_vbus(struct twl4030_usb *twl)
+{
+        int ret;
+
+        ret = twl4030_usb_read(twl, PHY_CLK_CTRL_STS);
+        if (ret < 0 || !(ret & PHY_DPLL_CLK))
+                /*
+                 * if clocks are off, registers are not updated,
+                 * but we can assume we don't drive VBUS in this case
+                 */
+                return false;
+
+        ret = twl4030_usb_read(twl, ULPI_OTG_CTRL);
+        if (ret < 0)
+                return false;
+
+        return (ret & (ULPI_OTG_DRVVBUS | ULPI_OTG_CHRGVBUS)) ? true : false;
+}
+
 static enum omap_musb_vbus_id_status
         twl4030_usb_linkstat(struct twl4030_usb *twl)
 {
@@ -270,13 +289,19 @@ static enum omap_musb_vbus_id_status
         if (status < 0)
                 dev_err(twl->dev, "USB link status err %d\n", status);
         else if (status & (BIT(7) | BIT(2))) {
-                if (status & (BIT(7)))
-                        twl->vbus_supplied = true;
+                if (status & BIT(7)) {
+                        if (twl4030_is_driving_vbus(twl))
+                                status &= ~BIT(7);
+                        else
+                                twl->vbus_supplied = true;
+                }
 
                 if (status & BIT(2))
                         linkstat = OMAP_MUSB_ID_GROUND;
-                else
+                else if (status & BIT(7))
                         linkstat = OMAP_MUSB_VBUS_VALID;
+                else
+                        linkstat = OMAP_MUSB_VBUS_OFF;
         } else {
                 if (twl->linkstat != OMAP_MUSB_UNKNOWN)
                         linkstat = OMAP_MUSB_VBUS_OFF;