[PATCH v2 0/6] Switch to generic syscon regmap based drivers

[Anand Moon]

Hi Javier,

On 21 October 2015 at 16:16, Alim Akhtar <alim.akhtar at samsung.com> wrote:
>
>
> On 10/21/2015 04:12 PM, Markus Reichl wrote:
>>
>> Am 21.10.2015 um 12:16 schrieb Javier Martinez Canillas:
>>>
>>> Hello Alim,
>>>
>>> On 10/21/2015 08:09 AM, Alim Akhtar wrote:
>>>
>>> [snip]
>>>
>>>>>>>>
>>>>>>>> Hi Alim,
>>>>>>>>
>>>>>>>> I have installed your patch set above with git am on top of
>>>>>>>> 4.3.0-rc6-00108-gce1fad2 torvalds/linux of today
>>>>>>>> with make exynos_defconfig on Odroid U3.
>>>>>>>>
>>>>>>> which exynos soc Odroid U3 uses?
>>>>>>>
>>>>>> OK, I can see its uses exynos4412 and exynos4412-odroidu3.dts does
>>>>>> include exynos4.dtsi,
>>>>>> so these should have worked.
>>>>>>
>>>>>>>> "halt -p" worked (power 0.0W).
>>>>>>>> "reboot" got stuck at 0.5W.
>>>>>>>>
>>>>>>> reboot stuck mean system does not reboot any more?
>>>>>
>>>>>
>>>>> It freezes when going for reboot.
>>>>> Have to power off/on to boot again.
>>>>>
>>>>> Btw I use an mmc, not an sd-card.
>>>>> No other HW connected, just LAN-cable.
>>>>> Bootloader is u-boot v2015.10.
>>>>> o
>>>>
>>>> Have checked on 4.3.0-rc6-00006-gd03c139e7e77, still works on peach
>>>> boards.
>>>> Sorry I don't have Odroid U3 with me, may be Javier or Krzysztof might
>>>> help here to check whats wrong. To me its looks more of a board specific
>>>> issue for now.
>>>>
>>>
>>> Krzysztof has an Odroid XU3 lite and I have an Odroid XU4, both uses an
>>> Exynos5422 so we can't check what's wrong with Odroid U3 (Exynos4412).
>>>
>>> Having said that I think I know what is the issue here. Markus said that
>>> he is using an eMMC instead of an uSD (which is what I used and my guess
>>> is that Krzysztof did too).
>>>
>>> Now, there is a subtle difference between the old PMU restart handler
>>> and the syscon-reboot one, and that is the restart handler priorities:
>>>
>>> notifier                    priority
>>> ------------------------------------
>>> pmu_restart_notify          128
>>> mmc_pwrseq_emmc_reset_nb    129
>>> syscon_restart_handle       192
>>>
>>> So, without Alim's patches, first the eMMC reset handler will be called
>>> and then the PMU restart handler but after his series, the syscon reset
>>> handler has a higher priority so the eMMC reset will never be called.
>>>
>>> But the problem is that the eMMC card has to be properly reset on system
>>> restart to allow the SoC iROM to be able to read the bootloader from the
>>> eMMC since the iROM doesn't have restart logic and the card shouldn't be
>>> left in an unknown state.
>>>
>>> So the problem here is not that the system is not being reset (that I
>>> think that works) but that on reboot, the system is not able to boot
>>> again since the ROM is not able to read the second stage bootloader.
>>>
>>> Markus,
>>>
>>> Can you please test following patch [0] on top of Alim's series? If that
>>> works then it should either be part of Alim's series or the patches will
>>> have to wait until that patch lands into mainline. I don't have an eMMC
>>> to test it in XU4 but I'm pretty confident that it will solve the issue.
>>
>>
>> Hi Javier,
>>
>> your patch fixes the issue, reboot works now on U3.
>>
> Good to know that.
> Thanks
>>
>> Tested-by: Markus Reichl <m.reichl at fivetechno.de>
>>
>> Thanks,
>> --
>> Markus
>>
>>
>>>
>>> Best regards,
>>>
>>

Tested on OdroidXU3 emmc. Reboot success.

Tested-by: Anand Moon <linux.amoon at gmail.com>

-Anand Moon
>>
>>
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