From: "Chew, Chiau Ee" <chiau.ee.c...@intel.com> 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.c...@intel.com> Acked-by: Andy Shevchenko <andriy.shevche...@linux.intel.com> Acked-by: Viresh Kumar <viresh.ku...@linaro.org> Signed-off-by: Vinod Koul <vinod.k...@intel.com> (cherry picked from commit 4501fe61b286e35be5b372a4f1ffcf5881ceeaed) Signed-off-by: Chang Rebecca Swee Fun <rebecca.swee.fun.ch...@intel.com> --- drivers/dma/dw/pci.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c index e89fc24..806bcb2 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 }, @@ -92,6 +122,9 @@ 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); -- 1.9.1 -- _______________________________________________ linux-yocto mailing list linux-yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/linux-yocto