Sometimes (firmware bug?) the V5 boost GPIO is not configured as output
by the BIOS, leading to the 5V boost convertor being permanently on,

Explicitly set the direction and drv flags rather then inheriting them
from the firmware to fix this.

Fixes: 585cb239f4de ("extcon: intel-cht-wc: Disable external 5v boost ...")
Cc: sta...@vger.kernel.org
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
Changes in v2:
-Add Fixes tag and Cc: stable
---
 drivers/extcon/extcon-intel-cht-wc.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-intel-cht-wc.c 
b/drivers/extcon/extcon-intel-cht-wc.c
index 7c4bc8c44c3f..b7e9ea377d70 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -66,6 +66,8 @@
 
 #define CHT_WC_VBUS_GPIO_CTLO          0x6e2d
 #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT   BIT(0)
+#define CHT_WC_VBUS_GPIO_CTLO_DRV_OD   BIT(4)
+#define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT  BIT(5)
 
 enum cht_wc_usb_id {
        USB_ID_OTG,
@@ -183,14 +185,15 @@ static void cht_wc_extcon_set_5v_boost(struct 
cht_wc_extcon_data *ext,
 {
        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);
+       val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT;
+       if (enable)
+               val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT;
+
+       ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val);
        if (ret)
                dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret);
 }
-- 
2.14.3

Reply via email to