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Date: Tue, 18 Mar 2014 22:52:03 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, rjw@...ysocki.net, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
Alexander Usyskin <alexander.usyskin@...el.com>,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 09/13] mei: txe: add runtime pm framework
From: Alexander Usyskin <alexander.usyskin@...el.com>
Add runtime pm framework for TXE devices.
The runtime pm handlers are used to run
txe power gating isolation protocol.
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/hw-txe.h | 2 +
drivers/misc/mei/pci-txe.c | 101 +++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 99 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/mei/hw-txe.h b/drivers/misc/mei/hw-txe.h
index 799f9f2..e8dd2d1 100644
--- a/drivers/misc/mei/hw-txe.h
+++ b/drivers/misc/mei/hw-txe.h
@@ -22,6 +22,8 @@
#include "hw.h"
#include "hw-txe-regs.h"
+#define MEI_TXI_RPM_TIMEOUT 500 /* ms */
+
/* Flatten Hierarchy interrupt cause */
#define TXE_INTR_READINESS_BIT 0 /* HISR_INT_0_STS */
#define TXE_INTR_READINESS HISR_INT_0_STS
diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
index ad3adb0..31d86e7 100644
--- a/drivers/misc/mei/pci-txe.c
+++ b/drivers/misc/mei/pci-txe.c
@@ -27,6 +27,7 @@
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
+#include <linux/pm_runtime.h>
#include <linux/mei.h>
@@ -137,12 +138,17 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto release_irq;
}
+ pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(&pdev->dev);
+
err = mei_register(dev);
if (err)
goto release_irq;
pci_set_drvdata(pdev, dev);
+ pm_runtime_put_noidle(&pdev->dev);
+
return 0;
release_irq:
@@ -187,6 +193,8 @@ static void mei_txe_remove(struct pci_dev *pdev)
return;
}
+ pm_runtime_get_noresume(&pdev->dev);
+
hw = to_txe_hw(dev);
mei_stop(dev);
@@ -265,15 +273,100 @@ static int mei_txe_pci_resume(struct device *device)
return err;
}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int mei_txe_pm_runtime_idle(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct mei_device *dev;
+
+ dev_dbg(&pdev->dev, "rpm: txe: runtime_idle\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+ if (mei_write_is_idle(dev))
+ pm_schedule_suspend(device, MEI_TXI_RPM_TIMEOUT * 2);
+
+ return -EBUSY;
+}
+static int mei_txe_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: txe: runtime suspend\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
-static SIMPLE_DEV_PM_OPS(mei_txe_pm_ops,
- mei_txe_pci_suspend,
- mei_txe_pci_resume);
+ mutex_lock(&dev->device_lock);
+
+ if (mei_write_is_idle(dev))
+ ret = mei_txe_aliveness_set_sync(dev, 0);
+ else
+ ret = -EAGAIN;
+
+ /*
+ * If everything is okay we're about to enter PCI low
+ * power state (D3) therefor we need to disable the
+ * interrupts towards host.
+ * However if device is not wakeable we do not enter
+ * D-low state and we need to keep the interrupt kicking
+ */
+ if (!ret && pci_dev_run_wake(pdev))
+ mei_disable_interrupts(dev);
+
+ dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
+
+ mutex_unlock(&dev->device_lock);
+ return ret;
+}
+
+static int mei_txe_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: txe: runtime resume\n");
+
+ dev = pci_get_drvdata(pdev);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ mei_enable_interrupts(dev);
+
+ ret = mei_txe_aliveness_set_sync(dev, 1);
+
+ mutex_unlock(&dev->device_lock);
+
+ dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
+
+ return ret;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops mei_txe_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
+ mei_txe_pci_resume)
+ SET_RUNTIME_PM_OPS(
+ mei_txe_pm_runtime_suspend,
+ mei_txe_pm_runtime_resume,
+ mei_txe_pm_runtime_idle)
+};
#define MEI_TXE_PM_OPS (&mei_txe_pm_ops)
#else
#define MEI_TXE_PM_OPS NULL
-#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_PM */
+
/*
* PCI driver structure
*/
--
1.8.5.3
--
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