bus: brcmstb_gisb: save and restore GISB timeout (203bb85e) · Commits · 戴 / test

drivers/bus/brcmstb_gisb.c

+36 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		#include <linux/list.h>
		#include <linux/of.h>
		#include <linux/bitops.h>
		#include <linux/pm.h>

		#include <asm/bug.h>
		#include <asm/signal.h>
		@@ -48,6 +49,7 @@ struct brcmstb_gisb_arb_device {
		struct list_head next;
		u32 valid_mask;
		const char master_names[sizeof(u32) BITS_PER_BYTE];
		u32 saved_timeout;
		};

		static LIST_HEAD(brcmstb_gisb_arb_device_list);
		@@ -264,6 +266,39 @@ static int brcmstb_gisb_arb_probe(struct platform_device *pdev)
		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static int brcmstb_gisb_arb_suspend(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);

		gdev->saved_timeout = ioread32(gdev->base + ARB_TIMER);

		return 0;
		}

		/* Make sure we provide the same timeout value that was configured before, and
		* do this before the GISB timeout interrupt handler has any chance to run.
		*/
		static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);

		iowrite32(gdev->saved_timeout, gdev->base + ARB_TIMER);

		return 0;
		}
		#else
		#define brcmstb_gisb_arb_suspend NULL
		#define brcmstb_gisb_arb_resume_noirq NULL
		#endif

		static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = {
		.suspend = brcmstb_gisb_arb_suspend,
		.resume_noirq = brcmstb_gisb_arb_resume_noirq,
		};

		static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
		{ .compatible = "brcm,gisb-arb" },
		{ },
		@@ -275,6 +310,7 @@ static struct platform_driver brcmstb_gisb_arb_driver = {
		.name = "brcm-gisb-arb",
		.owner = THIS_MODULE,
		.of_match_table = brcmstb_gisb_arb_of_match,
		.pm = &brcmstb_gisb_arb_pm_ops,
		},
		};

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