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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>
zero-colors
Hans de Goede 2017-04-05 00:04:52 +02:00 committed by Chanwoo Choi
parent 585cb239f4
commit c42a880c31
1 changed files with 11 additions and 4 deletions
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15
drivers/extcon/extcon-intel-cht-wc.c
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@ -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)