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Commit 4501fe61 authored by Chew, Chiau Ee's avatar Chew, Chiau Ee Committed by Vinod Koul
Browse files

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: default avatarChew, Chiau Ee <chiau.ee.chew@intel.com>
Acked-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 000871ce

drivers/dma/dw/pci.c

+33 −0
Original line number Diff line number Diff line
@@ -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);