Re: [PATCH 3/6] twl4030_charger: allow charging whenever VBUS is present.
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On Wed, Apr 25, 2012 at 10:33 AM, NeilBrown <neilb@xxxxxxx> wrote: > We currently refuse to charge if the USB ID pin is grounded, even > though VBUS might be present. > However some chargers do pull the ID pin low through a resistor which > might be as low as 47Kohm (openmoko charger). > > The documentation is unclear but some experimental evidence suggests > that when the charge pump provides VBUS that doesn't get reflected in > HW_CONDITIONS, so we should be safe to ignore the ID pin. On pandora I see the opposite, STS_VBUS is set regardless of who drives it, so this will break pandora.. > > Signed-off-by: NeilBrown <neilb@xxxxxxx> > --- > > drivers/power/twl4030_charger.c | 6 +----- > 1 file changed, 1 insertion(+), 5 deletions(-) > > diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c > index 0511610..684662a 100644 > --- a/drivers/power/twl4030_charger.c > +++ b/drivers/power/twl4030_charger.c > @@ -155,11 +155,7 @@ static int twl4030_bci_have_vbus(struct twl4030_bci *bci) > > dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts); > > - /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ > - if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID)) > - return 1; > - > - return 0; > + return (hwsts & TWL4030_STS_VBUS); > } > > /* > > -- Gražvydas -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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