Re: [PATCH v1] pmdomain: mediatek: Fix MT8183 hang on boot

[Brady Norander <brady.norander@mainlining.org>]

On 7/22/26 09:27, Dmitry Osipenko wrote:
> Depending on firmware, part of the MFG domains may be left ON at boot
> leaving only some MFG cores powered, to let the ACP to prefetch the GPU
> region when the display controller is brought up. This doesn't play well
> with an eventual delay in probing Panfrost when the display controller is
> fully set up, as that would make genpd's sync_state() to power off the
> domain while ACP tries to prefetch: this is causing an AXI stall,
> effectively freezing the AP indefinitely. In order to prevent this from
> happening, the sync_state() functionality must be obliterated on all of
> the MFG domains: while this guarantees a power leakage if the bootloader
> boots the kernel with MFG PDs partially powered on, this is the only way
> to ensure stable operation of the SoC during boot on devices with such
> firmware because, of course, those will never officially receive a
> firmware update.
> 
> Fixes Kappa Chromebook hanging during system boot.

I also saw this same issue on my MT8192 Hayato Chromebook, and I also 
saw an issue on my MT8183 and MT8186 Chromebooks where the audio was 
broken. I fixed all of those issues by setting the GENPD_FLAG_NO_STAY_ON 
flag on all domains. I held off from submitting that change as I was 
unsure if it was the "correct" way to handle it, but perhaps it is. 
Either way, this issue is not specific to only MT8183.