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>

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>
Chew, Chiau Ee · Vinod Koul · Eric Lee · Eric Lee · Eric Lee · Eric Lee
1 parent 000871ce03
Showing 1 changed file with 33 additions and 0 deletions Side-by-side Diff
drivers/dma/dw/pci.c
@@ -75,6 +75,36 @@
 		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 @@
 	.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);
...	...	@@ -75,6 +75,36 @@
75	75	dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
76	76	}
77	77
	78	+#ifdef CONFIG_PM_SLEEP
	79	+
	80	+static int dw_pci_suspend_late(struct device *dev)
	81	+{
	82	+ struct pci_dev *pci = to_pci_dev(dev);
	83	+ struct dw_dma_chip *chip = pci_get_drvdata(pci);
	84	+
	85	+ return dw_dma_suspend(chip);
	86	+};
	87	+
	88	+static int dw_pci_resume_early(struct device *dev)
	89	+{
	90	+ struct pci_dev *pci = to_pci_dev(dev);
	91	+ struct dw_dma_chip *chip = pci_get_drvdata(pci);
	92	+
	93	+ return dw_dma_resume(chip);
	94	+};
	95	+
	96	+#else /* !CONFIG_PM_SLEEP */
	97	+
	98	+#define dw_pci_suspend_late NULL
	99	+#define dw_pci_resume_early NULL
	100	+
	101	+#endif /* !CONFIG_PM_SLEEP */
	102	+
	103	+static const struct dev_pm_ops dw_pci_dev_pm_ops = {
	104	+ .suspend_late = dw_pci_suspend_late,
	105	+ .resume_early = dw_pci_resume_early,
	106	+};
	107	+
78	108	static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
79	109	/* Medfield */
80	110	{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
...	...	@@ -95,6 +125,9 @@
95	125	.id_table = dw_pci_id_table,
96	126	.probe = dw_pci_probe,
97	127	.remove = dw_pci_remove,
	128	+ .driver = {
	129	+ .pm = &dw_pci_dev_pm_ops,
	130	+ },
98	131	};
99	132
100	133	module_pci_driver(dw_pci_driver);