Re: [PATCH v3 12/17] arm64: dts: nvidia: Add EL2 virtual timer interrupt

[Jon Hunter <jonathanh@nvidia.com>]

Hi Marc,

On 30/06/2026 11:54, Marc Zyngier wrote:

...

>> Sorry for the delay. I gave this a test because I observed the warning
>> that was added on the Tegra194 and Tegra234 platforms. This change
>> fixes the warning for Tegra234, but on Tegra194 the platforms I tested
>> hang on boot. It appears to be similar to the issue that Marek saw on
>> his platforms and so I am wondering if Tegra194 also doesn't have this
>> wired up?
> 
> I think you are in a better position than me to find out. It also
> could be a firmware issue not making the PPI a Group-1 interrupt, and
> therefore not allow Linux to configure the interrupt.

Yes absolutely. I will see what I can find out.

>> Was there any resolution to the issue reported by Marek?
>>
>> FYI, the Tegra194 SoC has the 'NVIDIA Carmel ARM v8.2' CPUs [0].
> 
> There is no resolution so far. Florian was going to check what the
> deal is with the Broadcom-related systems, but hasn't come back with
> an answer yet.
> 
> The possibilities are as follows:
> 
> - remove the interrupt for the EL2 virtual timer and live with the
>    warning
> 
> - add a patch such as [1], which should document the reason why this
>    is now working (and fallback to the EL2 physical timer)
> 
> I'm happy either way, as long as we know exactly what we are dealing
> with on each affected platform.

I would like to get the warning fixed for Tegra234. Do you want to split 
that part out of your patch and then I can test and we can at least fix 
for that device while I see whats up with Tegra194?

Jon

-- 
nvpublic