mei: me: add runtime pm framework
Add runtime pm framework for ME devices.
The runtime pm handlers are used to run
me power gating isolation protocol
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 95889e2..fcbf270 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -33,6 +33,8 @@
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
+#include <linux/pm_runtime.h>
+
#include <linux/mei.h>
#include "mei_dev.h"
@@ -212,6 +214,9 @@
goto release_irq;
}
+ pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(&pdev->dev);
+
err = mei_register(dev);
if (err)
goto release_irq;
@@ -220,6 +225,9 @@
schedule_delayed_work(&dev->timer_work, HZ);
+ if (mei_pg_is_enabled(dev))
+ pm_runtime_put_noidle(&pdev->dev);
+
dev_dbg(&pdev->dev, "initialization successful.\n");
return 0;
@@ -259,6 +267,9 @@
if (!dev)
return;
+ if (mei_pg_is_enabled(dev))
+ pm_runtime_get_noresume(&pdev->dev);
+
hw = to_me_hw(dev);
@@ -343,12 +354,89 @@
return 0;
}
+#endif /* CONFIG_PM_SLEEP */
-static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
+#ifdef CONFIG_PM_RUNTIME
+static int mei_me_pm_runtime_idle(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+ if (mei_write_is_idle(dev))
+ pm_schedule_suspend(device, MEI_ME_RPM_TIMEOUT * 2);
+
+ return -EBUSY;
+}
+
+static int mei_me_pm_runtime_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+ int ret;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ if (mei_write_is_idle(dev))
+ ret = mei_me_pg_set_sync(dev);
+ else
+ ret = -EAGAIN;
+
+ mutex_unlock(&dev->device_lock);
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
+
+ return ret;
+}
+
+static int mei_me_pm_runtime_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+ int ret;
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ ret = mei_me_pg_unset_sync(dev);
+
+ mutex_unlock(&dev->device_lock);
+
+ dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
+
+ return ret;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops mei_me_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
+ mei_me_pci_resume)
+ SET_RUNTIME_PM_OPS(
+ mei_me_pm_runtime_suspend,
+ mei_me_pm_runtime_resume,
+ mei_me_pm_runtime_idle)
+};
+
#define MEI_ME_PM_OPS (&mei_me_pm_ops)
#else
#define MEI_ME_PM_OPS NULL
-#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_PM */
/*
* PCI driver structure
*/