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dma: dw: Add suspend and resume handling for PCI mode DW_DMAC.

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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>
This commit is contained in:
Chew, Chiau Ee 2014-03-15 02:02:39 +08:00 committed by Vinod Koul
parent 000871ce03
commit 4501fe61b2
1 changed files with 33 additions and 0 deletions
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33
drivers/dma/dw/pci.c
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@ -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);