mei: gsc: add runtime pm handlers

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>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220419193314.526966-5-daniele.ceraolospurio@intel.com

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index c91bf44..c8145e9 100644 (file)
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -159,7 +159,72 @@ 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[] = {
        {