summaryrefslogtreecommitdiffstats
path: root/drivers/extcon
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2017-04-05 00:04:52 +0200
committerChanwoo Choi <cw00.choi@samsung.com>2017-04-06 10:55:26 +0900
commitc42a880c3139cde603c5c83950ca7613aef7eedc (patch)
treeeb1f6070b8181ee1aa30915286006b374466840d /drivers/extcon
parent585cb239f4de6c11349e900dd8b4d8cf0825e802 (diff)
downloadlinux-c42a880c3139cde603c5c83950ca7613aef7eedc.tar.bz2
extcon: intel-cht-wc: Ignore failure to detect charger-type on host mode exit
When we leave host-mode because the id-pin is no longer connected to ground, the 5v boost converter is normally still on, so we will see Vbus, but it is not from a charger (normally) so the charger-type detection will fail. This commit silences the cht_wc_extcon_get_charger() false-positive errors when we're leaving host mode. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-intel-cht-wc.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index e22df5f2bea5..91a0023074af 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -96,6 +96,7 @@ struct cht_wc_extcon_data {
struct regmap *regmap;
struct extcon_dev *edev;
unsigned int previous_cable;
+ bool usb_host;
};
static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts)
@@ -112,7 +113,8 @@ static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts)
return USB_ID_FLOAT;
}
-static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext)
+static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext,
+ bool ignore_errors)
{
int ret, usbsrc, status;
unsigned long timeout;
@@ -135,6 +137,9 @@ static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext)
} while (time_before(jiffies, timeout));
if (status != CHT_WC_USBSRC_STS_SUCCESS) {
+ if (ignore_errors)
+ return EXTCON_CHG_USB_SDP; /* Save fallback */
+
if (status == CHT_WC_USBSRC_STS_FAIL)
dev_warn(ext->dev, "Could not detect charger type\n");
else
@@ -203,6 +208,8 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
{
int ret, pwrsrc_sts, id;
unsigned int cable = EXTCON_NONE;
+ /* Ignore errors in host mode, as the 5v boost converter is on then */
+ bool ignore_get_charger_errors = ext->usb_host;
ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
if (ret) {
@@ -223,7 +230,7 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
goto set_state;
}
- ret = cht_wc_extcon_get_charger(ext);
+ ret = cht_wc_extcon_get_charger(ext, ignore_get_charger_errors);
if (ret >= 0)
cable = ret;
@@ -238,8 +245,8 @@ set_state:
ext->previous_cable = cable;
}
- extcon_set_state_sync(ext->edev, EXTCON_USB_HOST,
- id == USB_ID_GND || id == USB_RID_A);
+ ext->usb_host = ((id == USB_ID_GND) || (id == USB_RID_A));
+ extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host);
}
static irqreturn_t cht_wc_extcon_isr(int irq, void *data)