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

[Tony Lindgren]

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: 5d1ebbda0318 ("phy: mapphone-mdm6600: Add USB PHY driver for MDM6600 on 
Droid 4")
Cc: Marcel Partap <mpar...@gmx.net>
Cc: Merlijn Wajer <merl...@wizzup.org>
Cc: Michael Scott <hashcod...@gmail.com>
Cc: NeKit <nekit1...@gmail.com>
Cc: Pavel Machek <pa...@ucw.cz>
Cc: Sebastian Reichel <s...@kernel.org>
Signed-off-by: Tony Lindgren <t...@atomide.com>
---
 drivers/phy/motorola/phy-mapphone-mdm6600.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c 
b/drivers/phy/motorola/phy-mapphone-mdm6600.c
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -243,10 +243,24 @@ 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;
 }
-- 
2.23.0