lkml.org 
[lkml]   [2011]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/5] spi_dw_pci: Add runtime power management
Date
From: Dirk Brandewie <dirk.brandewie@gmail.com>

This patch adds runtime power management to the PCI variant of the
designware SPI host controller driver.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
---
drivers/spi/spi-dw-pci.c | 59 +++++++++++++++++++++++++++++++++++++++++++++-
drivers/spi/spi-dw.c | 4 ++-
2 files changed, 61 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c
index eb35fa5..d661c2a 100644
--- a/drivers/spi/spi-dw-pci.c
+++ b/drivers/spi/spi-dw-pci.c
@@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>

#include "spi-dw.h"
@@ -91,6 +92,11 @@ static int __devinit spi_pci_probe(struct pci_dev *pdev,

/* PCI hook and SPI hook use the same drv data */
pci_set_drvdata(pdev, dwpci);
+
+ pm_suspend_ignore_children(&pdev->dev, true);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
+
return 0;

err_unmap:
@@ -110,6 +116,9 @@ static void __devexit spi_pci_remove(struct pci_dev *pdev)

pci_set_drvdata(pdev, NULL);
spi_dw_remove_host(&dwpci->dws);
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+
iounmap(dwpci->dws.regs);
pci_release_region(pdev, 0);
kfree(dwpci);
@@ -143,16 +152,61 @@ static int spi_resume(struct pci_dev *pdev)
return ret;
return spi_dw_resume_host(&dwpci->dws);
}
+
+static int spi_dw_pci_runtime_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
+ int ret;
+
+ dev_dbg(dev, "PCI runtime suspend called\n");
+
+ ret = spi_dw_stop_queue(&dwpci->dws);
+ if (ret == 0)
+ spi_dw_enable(&dwpci->dws);
+
+ return ret;
+}
+
+static int spi_dw_pci_runtime_resume(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
+
+ dev_dbg(dev, "pci_runtime_resume called\n");
+ return spi_dw_resume_host(&dwpci->dws);
+}
+
+static int spi_dw_pci_runtime_idle(struct device *dev)
+{
+ int err;
+
+ dev_dbg(dev, "pci_runtime_idle called\n");
+
+ err = pm_schedule_suspend(dev, 500);
+ if (err != 0)
+ return 0;
+ return -EBUSY;
+}
+
#else
#define spi_suspend NULL
#define spi_resume NULL
+#define spi_dw_pci_runtime_suspend NULL
+#define spi_dw_pci_runtime_resume NULL
+#define spi_dw_pci_runtime_idle NULL
#endif

static const struct pci_device_id pci_ids[] __devinitdata = {
- /* Intel MID platform SPI controller 0 */
+ /* Intel Moorestown platform SPI controller 0 */
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
{},
};
+static const struct dev_pm_ops dw_spi_pm_ops = {
+ .runtime_suspend = spi_dw_pci_runtime_suspend,
+ .runtime_resume = spi_dw_pci_runtime_resume,
+ .runtime_idle = spi_dw_pci_runtime_idle,
+};

static struct pci_driver dw_spi_driver = {
.name = DRIVER_NAME,
@@ -161,6 +215,9 @@ static struct pci_driver dw_spi_driver = {
.remove = __devexit_p(spi_pci_remove),
.suspend = spi_suspend,
.resume = spi_resume,
+ .driver = {
+ .pm = &dw_spi_pm_ops,
+ },
};

static int __init mrst_spi_init(void)
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 20f94fa..1210460 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -22,6 +22,7 @@
#include <linux/highmem.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>

#include "spi-dw.h"
@@ -438,7 +439,7 @@ static void pump_messages(struct work_struct *work)
struct slave_cfg *controller;
int err = 0;

-
+ pm_runtime_get_sync(dws->parent_dev);
message = get_message(dws);

while (message && dws->run != QUEUE_STOPPED) {
@@ -473,6 +474,7 @@ static void pump_messages(struct work_struct *work)
}
if (dws->run == QUEUE_STOPPED)
drain_message_queue(dws);
+ pm_runtime_put_sync(dws->parent_dev);
}

/* spi_device use this to queue in their spi_msg */
--
1.7.3.4


\
 
 \ /
  Last update: 2011-06-15 19:27    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site