dma: cppi41: add support for suspend and resume (f97b98d6) · Commits · 戴 / test

This patch adds support for suspend/resume functionality to the cppi41 DMA driver. The steps necessary to make the system resume properly were figured out by trial-and-error. The code as it stands now is the minimum that has to be done to put the musb host system on an AM33xx system into an operable state after resume. Signed-off-by:

Daniel Mack <zonque@gmail.com> Signed-off-by:

Vinod Koul <vinod.koul@intel.com>

drivers/dma/cppi41.c

+29 −0

Original line number	Diff line number	Diff line
		@@ -1045,12 +1045,41 @@ static int cppi41_dma_remove(struct platform_device *pdev)
		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static int cppi41_suspend(struct device *dev)
		{
		struct cppi41_dd *cdd = dev_get_drvdata(dev);

		cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
		disable_sched(cdd);

		return 0;
		}

		static int cppi41_resume(struct device *dev)
		{
		struct cppi41_dd *cdd = dev_get_drvdata(dev);
		int i;

		for (i = 0; i < DESCS_AREAS; i++)
		cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));

		init_sched(cdd);
		cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);

		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);

		static struct platform_driver cpp41_dma_driver = {
		.probe = cppi41_dma_probe,
		.remove = cppi41_dma_remove,
		.driver = {
		.name = "cppi41-dma-engine",
		.owner = THIS_MODULE,
		.pm = &cppi41_pm_ops,
		.of_match_table = of_match_ptr(cppi41_dma_ids),
		},
		};

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