diff options
| author | Chew, Chiau Ee <chiau.ee.chew@intel.com> | 2014-03-15 02:02:39 +0800 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2014-03-26 11:52:03 +0530 |
| commit | 4501fe61b286e35be5b372a4f1ffcf5881ceeaed (patch) | |
| tree | 6f00ea53d3e504b8538032937464bce50a7473d6 /drivers/dma | |
| parent | 000871ce0336572f5b126a4d7f1ec13fc9adfda2 (diff) | |
| download | linux-4501fe61b286e35be5b372a4f1ffcf5881ceeaed.tar.bz2 | |
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')
| -rw-r--r-- | drivers/dma/dw/pci.c | 33 |
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); |