linux-kernel - [PATCH v4 4/5] mei: gsc: add runtime pm handlers

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Date:   Thu, 27 Jan 2022 13:21:02 +0200
From:   Alexander Usyskin <alexander.usyskin@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Tomas Winkler <tomas.winkler@...el.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Vitaly Lubart <vitaly.lubart@...el.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/5] mei: gsc: add runtime pm handlers

From: Tomas Winkler <tomas.winkler@...el.com>

Implement runtime handlers for mei-gsc, to track
idle state of the device properly.

CC: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
---
V4: drop debug prints
---
 drivers/misc/mei/gsc-me.c | 67 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index cf427f6fdec9..dac482ddab51 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -152,7 +152,72 @@ static int __maybe_unused mei_gsc_pm_resume(struct device *device)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(mei_gsc_pm_ops, mei_gsc_pm_suspend, mei_gsc_pm_resume);
+static int __maybe_unused mei_gsc_pm_runtime_idle(struct device *device)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+
+	if (!dev)
+		return -ENODEV;
+	if (mei_write_is_idle(dev))
+		pm_runtime_autosuspend(device);
+
+	return -EBUSY;
+}
+
+static int  __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+	struct mei_me_hw *hw;
+	int ret;
+
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_write_is_idle(dev)) {
+		hw = to_me_hw(dev);
+		hw->pg_state = MEI_PG_ON;
+		ret = 0;
+	} else {
+		ret = -EAGAIN;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	return ret;
+}
+
+static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device)
+{
+	struct mei_device *dev = dev_get_drvdata(device);
+	struct mei_me_hw *hw;
+	irqreturn_t irq_ret;
+
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	hw = to_me_hw(dev);
+	hw->pg_state = MEI_PG_OFF;
+
+	mutex_unlock(&dev->device_lock);
+
+	irq_ret = mei_me_irq_thread_handler(1, dev);
+	if (irq_ret != IRQ_HANDLED)
+		dev_err(dev->dev, "thread handler fail %d\n", irq_ret);
+
+	return 0;
+}
+
+static const struct dev_pm_ops mei_gsc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mei_gsc_pm_suspend,
+				mei_gsc_pm_resume)
+	SET_RUNTIME_PM_OPS(mei_gsc_pm_runtime_suspend,
+			   mei_gsc_pm_runtime_resume,
+			   mei_gsc_pm_runtime_idle)
+};
 
 static const struct auxiliary_device_id mei_gsc_id_table[] = {
 	{
-- 
2.32.0