lkml.org 
[lkml]   [2013]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCHv3 5/5] arm: omap2+: omap_device: remove no_idle_on_suspend
Hi Kevin,
On Thursday 25 April 2013 03:45 AM, Kevin Hilman wrote:
> Sourav Poddar<sourav.poddar@ti.com> writes:
>
>> Remove "no_idle_on_suspend" check, since respective
>> driver should be able to prevent idling of a
>> device whenever required.
>>
>> Driver's can get same behavior by just returning -EBUSY
>> from their ->runtime_suspend only during suspend.
>>
>> Cc: Santosh Shilimkar<santosh.shilimkar@ti.com>
>> Cc: Felipe Balbi<balbi@ti.com>
>> Cc: Rajendra nayak<rnayak@ti.com>
>> Cc: Grygorii Strashko<grygorii.strashko@ti.com>
>> Signed-off-by: Sourav Poddar<sourav.poddar@ti.com>
>> Reviewed-by: Felipe Balbi<balbi@ti.com>
>> ---
>> arch/arm/mach-omap2/omap_device.c | 12 +++---------
>> arch/arm/mach-omap2/omap_device.h | 10 ----------
>> 2 files changed, 3 insertions(+), 19 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
>> index 381be7a..2043d71 100644
>> --- a/arch/arm/mach-omap2/omap_device.c
>> +++ b/arch/arm/mach-omap2/omap_device.c
>> @@ -170,9 +170,6 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
>> r->name = dev_name(&pdev->dev);
>> }
>>
>> - if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
>> - omap_device_disable_idle_on_suspend(pdev);
>> -
>> pdev->dev.pm_domain =&omap_device_pm_domain;
>>
>> odbfd_exit1:
>> @@ -620,11 +617,9 @@ static int _od_suspend_noirq(struct device *dev)
>> ret = pm_generic_suspend_noirq(dev);
>>
>> if (!ret&& !pm_runtime_status_suspended(dev)) {
>> - if (pm_generic_runtime_suspend(dev) == 0) {
>> - if (!(od->flags& OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
>> - omap_device_idle(pdev);
>> + if (pm_generic_runtime_suspend(dev) == 0)
>> + omap_device_idle(pdev);
>> od->flags |= OMAP_DEVICE_SUSPENDED;
>> - }
> Look closely at the if statement, followed by more than one line, and
> the braces removed.
>
> That means that od->flag will be set, even when omap_device_idle() was
> not called. Which in turn means that upon resume, omap_device_enable()
> will be called on a device that has not had omap_device_idle() called,
> which means there would be WARNs coming from omap_device due to the
> mismatch.
>
True, my bad. Will modify the code to bypass
"od->flags |= OMAP_DEVICE_SUSPENDED"
> Hmm... this does not instill confidence that this code has been tested.
>
Sorry for the above glitch, I tested this code. I checked that the
system is able to resume from suspend state, but completely missed the
following statement in the log..
"[ 47.922424] omap_uart omap_uart.2: omap_device: omap_device_enable()
called from invalid state 1"

> Kevin
>
>
>> }
>>
>> return ret;
>> @@ -638,8 +633,7 @@ static int _od_resume_noirq(struct device *dev)
>> if ((od->flags& OMAP_DEVICE_SUSPENDED)&&
>> !pm_runtime_status_suspended(dev)) {
>> od->flags&= ~OMAP_DEVICE_SUSPENDED;
>> - if (!(od->flags& OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
>> - omap_device_enable(pdev);
>> + omap_device_enable(pdev);
>> pm_generic_runtime_resume(dev);
>> }
>>
>> diff --git a/arch/arm/mach-omap2/omap_device.h b/arch/arm/mach-omap2/omap_device.h
>> index 044c31d..17ca1ae 100644
>> --- a/arch/arm/mach-omap2/omap_device.h
>> +++ b/arch/arm/mach-omap2/omap_device.h
>> @@ -38,7 +38,6 @@ extern struct dev_pm_domain omap_device_pm_domain;
>>
>> /* omap_device.flags values */
>> #define OMAP_DEVICE_SUSPENDED BIT(0)
>> -#define OMAP_DEVICE_NO_IDLE_ON_SUSPEND BIT(1)
>>
>> /**
>> * struct omap_device - omap_device wrapper for platform_devices
>> @@ -101,13 +100,4 @@ static inline struct omap_device *to_omap_device(struct platform_device *pdev)
>> {
>> return pdev ? pdev->archdata.od : NULL;
>> }
>> -
>> -static inline
>> -void omap_device_disable_idle_on_suspend(struct platform_device *pdev)
>> -{
>> - struct omap_device *od = to_omap_device(pdev);
>> -
>> - od->flags |= OMAP_DEVICE_NO_IDLE_ON_SUSPEND;
>> -}
>> -
>> #endif



\
 
 \ /
  Last update: 2013-04-25 09:01    [W:0.108 / U:0.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site