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Message-Id: <20170403112630.30625-3-hdegoede@redhat.com>
Date: Mon, 3 Apr 2017 13:26:30 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: Hans de Goede <hdegoede@...hat.com>, Takashi Iwai <tiwai@...e.de>,
linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] 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@...hat.com>
---
drivers/extcon/extcon-intel-cht-wc.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index 8651f63..0e1f2c7 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -98,6 +98,7 @@ 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)
@@ -114,7 +115,8 @@ 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;
@@ -137,6 +139,9 @@ 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
@@ -206,6 +211,8 @@ 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) {
@@ -226,7 +233,7 @@ 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;
@@ -241,8 +248,8 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext)
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)
--
2.9.3
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