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authorChew, Chiau Ee <chiau.ee.chew@intel.com>2014-03-15 02:02:39 +0800
committerVinod Koul <vinod.koul@intel.com>2014-03-26 11:52:03 +0530
commit4501fe61b286e35be5b372a4f1ffcf5881ceeaed (patch)
tree6f00ea53d3e504b8538032937464bce50a7473d6 /drivers/dma/dw
parent000871ce0336572f5b126a4d7f1ec13fc9adfda2 (diff)
dma: dw: Add suspend and resume handling for PCI mode DW_DMAC.
This is to disable/enable DW_DMAC hw during late suspend/early resume. Since DMA is providing service to other clients (eg: SPI, HSUART), we need to ensure DMA suspends after the clients and resume before the clients are active. Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw')
-rw-r--r--drivers/dma/dw/pci.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
index 755cc6b54453..fec59f1a77bb 100644
--- a/drivers/dma/dw/pci.c
+++ b/drivers/dma/dw/pci.c
@@ -75,6 +75,36 @@ static void dw_pci_remove(struct pci_dev *pdev)
dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
}
+#ifdef CONFIG_PM_SLEEP
+
+static int dw_pci_suspend_late(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct dw_dma_chip *chip = pci_get_drvdata(pci);
+
+ return dw_dma_suspend(chip);
+};
+
+static int dw_pci_resume_early(struct device *dev)
+{
+ struct pci_dev *pci = to_pci_dev(dev);
+ struct dw_dma_chip *chip = pci_get_drvdata(pci);
+
+ return dw_dma_resume(chip);
+};
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define dw_pci_suspend_late NULL
+#define dw_pci_resume_early NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops dw_pci_dev_pm_ops = {
+ .suspend_late = dw_pci_suspend_late,
+ .resume_early = dw_pci_resume_early,
+};
+
static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
/* Medfield */
{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
@@ -95,6 +125,9 @@ static struct pci_driver dw_pci_driver = {
.id_table = dw_pci_id_table,
.probe = dw_pci_probe,
.remove = dw_pci_remove,
+ .driver = {
+ .pm = &dw_pci_dev_pm_ops,
+ },
};
module_pci_driver(dw_pci_driver);