Re: RFC: Proper suspend-to-ram implementation of Ingenic SoCs

[Zhou Yanjie <zhouyanjie@wanyeetech.com>]

Hi Paul,

On 2022/7/14 上午12:08, Paul Cercueil wrote:
> Hi Mike,
> [...]
>
>> If I comment the "wait" instruction, it will exit the suspend process 
>> immediately. And yes, I don't think it suspended properly.
>
> Ok. I was suggesting to try that since it would show if the crash 
> happens when a particular device gets suspended.
>
> Are you certain that your wakeup IRQ is unmasked?
>
> [...]
>
>>>>>  I'm afraid the above didn't work for me. Have you tested 
>>>>> suspend-to-ram in person on a X series SoC?
>>>
>>>  I didn't test on X-series, I mostly work with JZ. But that part of 
>>> the design didn't change since the JZ4740.
>>>
>>>  Cheers,
>>>  -Paul
>>>
>>>
>>
>>
>> To be honest, I never owned a board with a JZ series SoC. And sorry 
>> for assuming the suspend-to-ram is unusable on all Ingenic SoCs. 
>> IIRC, all the JZ series SoCs have external DRAM, while the X series 
>> SoCs have internal DRAM. Also Ingenic advertised the power saving 
>> features of the X series SoCs heavily. Things might be different 
>> since it may involve additional power management.
>
> Even if the 3.x method you were describing works, the currently 
> upstream method should work as well, and if it doesn't, we probably 
> should try to figure why.
>
> I remember doing some tests on the JZ4770 some years ago, and I would 
> get a power consumption of 7mA when suspended - that's for the whole 
> board, measured at the 3.7V battery, so about 0.026 W. The only things 
> powered ON then are the RAM chips and the SoC's RTC module.
>
>> At the time of writing the last sentence of the email, Dr. Zhou just 
>> pointed out that it may has something to do with the secure boot 
>> feature introduced in the X series SoC, although the feature is not 
>> enabled. I already mailed my X1000E & X1501 boards to Dr. Zhou for 
>> further tests. You may want to get a X1000(E) board (e.g. halley2) 
>> and test this by yourself.
>
> I do have a Cu1000-Neo board, but I have never used it, I wouldn't 
> know how to test this.
>

The CU1000-Neo board does not lead out the wakeup pins, maybe it can be 
tested with GKD350 (X1830)?


Thanks and best regards!


> Cheers,
> -Paul
>