[PATCH v2 2/3] OMAP: bus-level PM: enable use of runtime PM API for suspend/resume
From: Kevin Hilman <hidden>
Date: 2010-06-24 23:43:10
Also in:
linux-omap
Subsystem:
arm port, omap power management support, omap2+ support, the rest · Maintainers:
Russell King, Kevin Hilman, Aaro Koskinen, Andreas Kemnade, Roger Quadros, Tony Lindgren, Linus Torvalds
Hook into the platform bus methods for suspend and resume and use the runtime PM API to allow the OMAP runtime PM core (based on omap_device) to automatically idle and enable the device on suspend and resume. This allows device drivers to get rid of direct management of their clocks in their suspend/resume paths, and let omap_device do it for them . We currently use the _noirq (late suspend, early resume) versions of the suspend/resume methods to ensure that the device is not disabled too early for any drivers also using the _noirq methods. NOTE: only works for devices with omap_hwmod support. Signed-off-by: Kevin Hilman <redacted> --- arch/arm/mach-omap2/pm_bus.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm_bus.c b/arch/arm/mach-omap2/pm_bus.c
index 9719a9f..5e453dc 100644
--- a/arch/arm/mach-omap2/pm_bus.c
+++ b/arch/arm/mach-omap2/pm_bus.c@@ -68,3 +68,51 @@ int platform_pm_runtime_idle(struct device *dev) }; #endif /* CONFIG_PM_RUNTIME */ +#ifdef CONFIG_SUSPEND +int platform_pm_suspend_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->suspend_noirq) + ret = drv->pm->suspend_noirq(dev); + } + + /* + * The DPM core has done a 'get' to prevent runtime PM + * transitions during system PM. This put is to balance + * out that get so that this device can now be runtime + * suspended. + */ + pm_runtime_put_sync(dev); + + return ret; +} + +int platform_pm_resume_noirq(struct device *dev) +{ + struct device_driver *drv = dev->driver; + int ret = 0; + + /* + * This 'get' is to balance the 'put' in the above suspend_noirq + * method so that the runtime PM usage counting is in the same + * state it was when suspend was called. + */ + pm_runtime_get_sync(dev); + + if (!drv) + return 0; + + if (drv->pm) { + if (drv->pm->resume_noirq) + ret = drv->pm->resume_noirq(dev); + } + + return ret; +} +#endif /* CONFIG_SUSPEND */
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1.7.0.2