phy: mapphone-mdm6600: Fix timeouts by adding wake-up handling

We have an interrupt handler for the wake-up GPIO pin, but we're missing
the code to wake-up the system. This can cause timeouts receiving data
for the UART that shares the wake-up GPIO pin with the USB PHY.

All we need to do is just wake the system and kick the autosuspend
timeout to fix the issue.

Fixes: 5d1ebbd ("phy: mapphone-mdm6600: Add USB PHY driver for MDM6600 on Droid 4")
Cc: Marcel Partap <[email protected]>
Cc: Merlijn Wajer <[email protected]>
Cc: Michael Scott <[email protected]>
Cc: NeKit <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Kishon Vijay Abraham I <[email protected]>

Author: tmlind

drivers/phy/motorola/phy-mapphone-mdm6600.c

@@ -244,10 +244,24 @@ static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 {
 	struct phy_mdm6600 *ddata = data;
 	struct gpio_desc *mode_gpio1;
+	int error, wakeup;
 
 	mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
-	dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
-		gpiod_get_value(mode_gpio1));
+	wakeup = gpiod_get_value(mode_gpio1);
+	if (!wakeup)
+		return IRQ_NONE;
+
+	dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n", wakeup);
+	error = pm_runtime_get_sync(ddata->dev);
+	if (error < 0) {
+		pm_runtime_put_noidle(ddata->dev);
+
+		return IRQ_NONE;
+	}
+
+	/* Just wake-up and kick the autosuspend timer */
+	pm_runtime_mark_last_busy(ddata->dev);
+	pm_runtime_put_autosuspend(ddata->dev);
 
 	return IRQ_HANDLED;
 }