linux-kernel - Re: [PATCH] ARM: pxa: fix suspend on PXA3XX

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Date:	Thu, 27 Jan 2011 22:46:54 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Sven Neumann <s.neumann@...mfeld.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Daniel Mack <daniel@...aq.de>
Subject: Re: [PATCH] ARM: pxa: fix suspend on PXA3XX

On Wed, Jan 26, 2011 at 4:10 PM, Sven Neumann <s.neumann@...mfeld.com> wrote:
> On Wed, 2011-01-26 at 05:06 +0800, Eric Miao wrote:
>> How about this instead?
>>
>> diff --git a/arch/arm/mach-pxa/pm.c b/arch/arm/mach-pxa/pm.c
>> index 978e1b2..1807c9a 100644
>> --- a/arch/arm/mach-pxa/pm.c
>> +++ b/arch/arm/mach-pxa/pm.c
>> @@ -33,7 +33,7 @@ int pxa_pm_enter(suspend_state_t state)
>>  #endif
>>
>>       /* skip registers saving for standby */
>> -     if (state != PM_SUSPEND_STANDBY) {
>> +     if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
>>               pxa_cpu_pm_fns->save(sleep_save);
>>               /* before sleeping, calculate and save a checksum */
>>               for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
>> @@ -44,7 +44,7 @@ int pxa_pm_enter(suspend_state_t state)
>>       pxa_cpu_pm_fns->enter(state);
>>       cpu_init();
>>
>> -     if (state != PM_SUSPEND_STANDBY) {
>> +     if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
>>               /* after sleeping, validate the checksum */
>>               for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
>>                       checksum += sleep_save[i];
>>
>
> Not sure if that will work as well. With this change the code is
> skipping more than just the calls to pxa_cpu_pm_fns->save() and
> pxa_cpu_pm_fns->restore(). In particular it doesn't call
> pxa_cpu_pm_fns->enter(state).
>

Nah, that ->enable() is called if the checksum is incorrect. Please compare
with the original code?

>
> Thanks,
> Sven
>
>
>
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