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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Marcel Partap <mpartap@gmx.net>,
        Merlijn Wajer <merlijn@wizzup.org>,
        Michael Scott <hashcode0f@gmail.com>,
        NeKit <nekit1000@gmail.com>, Pavel Machek <pavel@ucw.cz>,
        Sebastian Reichel <sre@kernel.org>,
        Tony Lindgren <tony@atomide.com>,
        Kishon Vijay Abraham I <kishon@ti.com>
Subject: [PATCH 5.5 151/189] phy: mapphone-mdm6600: Fix timeouts by adding wake-up handling
Date:   Tue, 10 Mar 2020 13:39:48 +0100
Message-Id: <20200310123655.153465134@linuxfoundation.org>
In-Reply-To: <20200310123639.608886314@linuxfoundation.org>
References: <20200310123639.608886314@linuxfoundation.org>
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From: Tony Lindgren <tony@atomide.com>

commit be4e3c737eebd75815633f4b8fd766defaf0f1fc upstream.

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 <mpartap@gmx.net>
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Michael Scott <hashcode0f@gmail.com>
Cc: NeKit <nekit1000@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/phy/motorola/phy-mapphone-mdm6600.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

--- 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_t
 {
 	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;
 }