[PATCH 3/4] mfd: max77620: override PSCI poweroff handler on Pixel C

[Diogo Ivo]

On 5/21/26 11:43, Thierry Reding wrote:
> On Thu, May 21, 2026 at 11:23:11AM +0200, Diogo Ivo wrote:
>>
>>
>> On 5/21/26 09:52, Thierry Reding wrote:
>>> On Thu, May 14, 2026 at 04:47:21PM +0200, Diogo Ivo wrote:
>>>> On Pixel C, shutdown must be handled by the MAX77620 PMIC rather
>>>> than the PSCI SYSTEM_OFF call, whose firmware implementation is:
>>>>
>>>> __dead2 void tegra_system_off(void)
>>>> {
>>>>           ERROR("Tegra System Off: operation not handled.\n");
>>>>           panic();
>>>> }
>>>
>>> Ugh... sounds very familiar. We have similar stub implementations on
>>> Jetson TX1 and/or Nano, if I remember correctly. Luckily newer platforms
>>> seem to have proper implementations for these.
>>
>> Yes, on my TX1 I was encountering the same problem. However in that case
>> is it possible to update the firmware with a proper implementation?
> 
> I tried, but there were complications, both technical and logistical
> because of the point in the product lifecycle. At this point I don't
> think it will happen, unfortunately.

Ah, I see. Then in that case this approach seems like a viable option
for those platforms :)

Best regards,
Diogo

> Thierry