AW: hang check triggered at low temperatures

[Sven Schmitt]

Hi Lucas,

>Hi Sven,
>
>Am Montag, den 04.06.2018, 06:31 +0000 schrieb Sven Schmitt:
>> Hello,
>>
>> we have discovered a sneaky, temperature based problem in the imx6
>> etnaviv driver.
>>
>> If the chip temperature falls bellow 10 degrees celsius and display
>> update rate raises above 200ms the etnaviv gpu hang check is
>> triggered reproducible [1].
>> We have the suspicion that the runtime pm autosuspend mechanism
>> (configured to 200ms [2]) is the root of the problem.
>> Disabling CONFIG_PM heals the bug.
>
>My guess would be that this isn't directly related to the GPU or it's
>driver, but a bug in the power gating. To confirm/dismiss my suspicion
>you may change imx6_pm_domain_power_off() in drivers/soc/imx/gpc.c to
>always return -EBUSY early to prevent the domain from being power
>gated.

You're right. I've set "err009619_present = true" in "struct imx_gpc_dt_data imx6q_dt_data" which has the same effect.
Is this a appropriate solution for the problem?

Regards,
Sven