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authorTony Lindgren <tony@atomide.com>2016-02-12 08:56:52 -0800
committerTony Lindgren <tony@atomide.com>2016-02-12 08:56:52 -0800
commit08c78e9d61a857c9077240e7ddb67550c6f96d06 (patch)
treeac71be08409c23eb6e2861e6c43aadcb9288e1a0
parentbf26927b2c0780609e6e5361d177cf10107065f3 (diff)
downloadop-kernel-dev-08c78e9d61a857c9077240e7ddb67550c6f96d06.zip
op-kernel-dev-08c78e9d61a857c9077240e7ddb67550c6f96d06.tar.gz
ARM: OMAP2+: Improve omap_device error for driver writers
Drivers using pm_runtime_use_autosuspend() may not get disabled after -EPROBE_DEFER. On the following device driver probe, hardware state is different from the PM runtime state causing omap_device to produce the following error: omap_device_enable() called from invalid state 1 And with omap_device and omap hardware being picky for PM, this will block any deeper idle states in hardware. Let's add a proper error message so driver writers can easily fix their drivers for PM. In general, the solution is to fix the drivers to follow the PM runtime documentation: 1. For sections of code that needs the device disabled, use pm_runtime_put_sync_suspend() if pm_runtime_set_autosuspend() has been set. 2. For driver exit code, use pm_runtime_dont_use_autosuspend() before pm_runtime_put_sync() if pm_runtime_use_autosuspend() has been set. Let's not return with 0 from _od_runtime_resume() as that will eventually lead into new drivers with broken PM runtime that will block deeper idle states on omaps. Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Nishanth Menon <nm@ti.com> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Tero Kristo <t-kristo@ti.com> Acked-by: Kevin Hilman <khilman@baylibre.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
-rw-r--r--arch/arm/mach-omap2/omap_device.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 0437537..ebd8369 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -602,8 +602,10 @@ static int _od_runtime_resume(struct device *dev)
int ret;
ret = omap_device_enable(pdev);
- if (ret)
+ if (ret) {
+ dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
return ret;
+ }
return pm_generic_runtime_resume(dev);
}
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