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Subject[PATCH 4/5] mei: gsc: add runtime pm handlers
Date
From: Tomas Winkler <tomas.winkler@intel.com>

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

CC: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
drivers/misc/mei/gsc-me.c | 80 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index c6bf869d910b..51b00e5ea122 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -167,7 +167,85 @@ 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_dbg(device, "rpm: me: runtime_idle\n");
+
+ 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;
+ struct mei_me_hw *hw;
+ int ret;
+
+ dev_dbg(device, "rpm: me: runtime suspend\n");
+
+ dev = dev_get_drvdata(device);
+ 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);
+
+ dev_dbg(device, "rpm: me: runtime suspend ret=%d\n", ret);
+
+ return ret;
+}
+
+static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device)
+{
+ struct mei_device *dev;
+ struct mei_me_hw *hw;
+ irqreturn_t irq_ret;
+
+ dev_dbg(device, "rpm: me: runtime resume\n");
+
+ dev = dev_get_drvdata(device);
+ 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);
+
+ dev_dbg(device, "rpm: me: runtime resume ret = 0\n");
+
+ 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 platform_device_id gsc_devtypes[] = {
{
--
2.32.0
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