[PATCH v2, 1/1] mtd: devices: m25p80: Add PM suspend resume support

[Marek Vasut]

On 01/20/2017 07:50 PM, Kamal Dasu wrote:
> On Fri, Jan 20, 2017 at 12:22 PM, Marek Vasut <marex at denx.de> wrote:
>> On 01/20/2017 05:33 PM, Kamal Dasu wrote:
>>> Marek,
>>>
>>>>>
>>>>> OK, so I'm fine with leaving the patch as is for now but I would like Marek
>>>>> review just to be sure we didn't miss something: Marek, any comments?
>>>>>
>>>>> I just have one more comment below but it's only a detail.
>>>>
>>>> What would happen if you have a FS attached on this SPI NOR (like UBIFS)
>>>> and you suspend with this patch ? Will it survive ?
>>>>
>>>>
>>>
>>> I have tried with both jffs2 rw and ubifs rw rootfs on spi-nor
>>> booting from spi-nor partitions while  active filesystem operations
>>> were going on over suspend/resume cycles. And it survives.
>>
>> Can you elaborate on your test a bit ?
>>
> 
> The power management test  puts  board in standby mode,  during
> standby the DRAM is in refresh and power to the spi-nor is removed.
> After a set timeout the board wakes up again and resumes from where it
> left off. This pm test is run while a cp command is invoked where a
> file is transferred to the rw rootfs. The test loops through said
> number of iterations of suspend and resumes cycles. The copy
> operations is eventually done over a few cycles. Once the test is
> completed  filesystem should have no corruptions, the copied files
> should compare and rootfs should be intact.  This test was repeated
> with jffs2 as well as ubifs rootfs flashed on spi-nor device.

Would be much nicer if you could just share the script you used.


-- 
Best regards,
Marek Vasut