Hi,
On Thu, Mar 21, 2013 at 03:42:46PM +0200, Grazvydas Ignotas wrote:
> >> 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 <nota...@gmail.com>
> >> ---
> >> drivers/usb/phy/phy-twl4030-usb.c | 36
> >> +++++++++++++++++++++++++++++++-----
> >> 1 file changed, 31 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/usb/phy/phy-twl4030-usb.c
> >> b/drivers/usb/phy/phy-twl4030-usb.c
> >> index 425c18a..87bf11d 100644
> >> --- a/drivers/usb/phy/phy-twl4030-usb.c
> >> +++ b/drivers/usb/phy/phy-twl4030-usb.c
> >> @@ -248,11 +248,31 @@ 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)
> >> {
> >> int status;
> >> enum omap_musb_vbus_id_status linkstat = OMAP_MUSB_UNKNOWN;
> >> + bool driving_vbus = false;
> >>
> >> twl->vbus_supplied = false;
> >>
> >> @@ -270,20 +290,26 @@ 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)) {
> >> + driving_vbus = twl4030_is_driving_vbus(twl);
> >> + if (driving_vbus)
> >
> > how about just:
> >
> > if (twl4030_is_driving_vbus(twl))
> > status &= ~BIT(7);
> >
> > ????
>
> I'm logging driving_vbus below with dev_dbg(), so that it's easier to
> see what going on..is that really necessary ? Don't we expose it through sysfs already ? -- balbi
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