linux-kernel - [PATCH v2] extcon: int3496: process id-pin first so that we start with the right status

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Date:   Tue,  6 Feb 2018 09:10:51 +0100
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>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH v2] extcon: int3496: process id-pin first so that we start with the right status

Some other drivers may be waiting for our extcon to show-up (exiting their
probe methods with -EPROBE_DEFER until we show up).

These drivers will typically get the cable state directly after getting
the extcon, this commit changes the int3496 code to process the id-pin
before registering the extcon, so that other drivers see the correct state
right away.

Fixes: 2f556bdb9f2e ("extcon: int3496: Add Intel INT3496 ACPI ... driver")
Cc: stable@...r.kernel.org
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/extcon/extcon-intel-int3496.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
index c8691b5a9cb0..b23ee9d993a3 100644
--- a/drivers/extcon/extcon-intel-int3496.c
+++ b/drivers/extcon/extcon-intel-int3496.c
@@ -131,6 +131,10 @@ static int int3496_probe(struct platform_device *pdev)
 	if (IS_ERR(data->gpio_usb_mux))
 		dev_info(dev, "can't request USB MUX GPIO\n");
 
+	/* process id-pin first so that we start with the right status */
+	queue_delayed_work(system_wq, &data->work, 0);
+	flush_delayed_work(&data->work);
+
 	/* register extcon device */
 	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
 	if (IS_ERR(data->edev))
@@ -153,9 +157,6 @@ static int int3496_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	/* queue initial processing of id-pin */
-	queue_delayed_work(system_wq, &data->work, 0);
-
 	platform_set_drvdata(pdev, data);
 
 	return 0;
-- 
2.14.3