diff options
Diffstat (limited to 'drivers/extcon/extcon-intel-cht-wc.c')
| -rw-r--r-- | drivers/extcon/extcon-intel-cht-wc.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c index f1c43af..e22df5f 100644 --- a/drivers/extcon/extcon-intel-cht-wc.c +++ b/drivers/extcon/extcon-intel-cht-wc.c @@ -64,6 +64,9 @@ #define CHT_WC_PWRSRC_ID_GND BIT(3) #define CHT_WC_PWRSRC_ID_FLOAT BIT(4) +#define CHT_WC_VBUS_GPIO_CTLO 0x6e2d +#define CHT_WC_VBUS_GPIO_CTLO_OUTPUT BIT(0) + enum cht_wc_usb_id { USB_ID_OTG, USB_ID_GND, @@ -170,6 +173,23 @@ static void cht_wc_extcon_set_phymux(struct cht_wc_extcon_data *ext, u8 state) dev_err(ext->dev, "Error writing phyctrl: %d\n", ret); } +static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext, + bool enable) +{ + int ret, val; + + val = enable ? CHT_WC_VBUS_GPIO_CTLO_OUTPUT : 0; + + /* + * The 5V boost converter is enabled through a gpio on the PMIC, since + * there currently is no gpio driver we access the gpio reg directly. + */ + ret = regmap_update_bits(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, + CHT_WC_VBUS_GPIO_CTLO_OUTPUT, val); + if (ret) + dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret); +} + /* Small helper to sync EXTCON_CHG_USB_SDP and EXTCON_USB state */ static void cht_wc_extcon_set_state(struct cht_wc_extcon_data *ext, unsigned int cable, bool state) @@ -280,6 +300,21 @@ static int cht_wc_extcon_probe(struct platform_device *pdev) if (IS_ERR(ext->edev)) return PTR_ERR(ext->edev); + /* + * When a host-cable is detected the BIOS enables an external 5v boost + * converter to power connected devices there are 2 problems with this: + * 1) This gets seen by the external battery charger as a valid Vbus + * supply and it then tries to feed Vsys from this creating a + * feedback loop which causes aprox. 300 mA extra battery drain + * (and unless we drive the external-charger-disable pin high it + * also tries to charge the battery causing even more feedback). + * 2) This gets seen by the pwrsrc block as a SDP USB Vbus supply + * Since the external battery charger has its own 5v boost converter + * which does not have these issues, we simply turn the separate + * external 5v boost converter off and leave it off entirely. + */ + cht_wc_extcon_set_5v_boost(ext, false); + /* Enable sw control */ ret = cht_wc_extcon_sw_control(ext, true); if (ret) |
