[REGRESSION] mt8183-kukui: dts: changes in dts caused display to no longer initialize - Was: Re: mt8183-kukui: drm/mediatek: dts: Invalid display hw pipeline when probing mediatek-drm

[AngeloGioacchino Del Regno]

Il 13/02/26 10:27, Thorsten Leemhuis ha scritto:
> On 2/9/26 12:42, AngeloGioacchino Del Regno wrote:
>> Il 06/02/26 17:58, Denis Gessert ha scritto:
>>> Thanks for the quick response. I compiled 6.18.9 with this patch
>>> (without reverting the previous commit) and it boots successfully.
>>
>> Well, I missed all those replies to this thread, and sent a redundant reply
>> saying .. well, the same as Thorsten (hey, thanks for being faster than
>> me!).
> 
> Happens. :-D
> 
>> Happy to see further confirmation that the patch that we both mentioned is
>> actually fixing the issue.
> 
> The big question remains: Now that this landed in mainline, should we as
> the stable team to pick this up for 6.18.y and 6.19.y to get it resolved
> there quickly? They might pick it up on their own due to the Fixes tag,
> but that is not guaranteed.
> 

Yes, please, that'd be great.

Cheers,
Angelo

> Ciao, Thorsten
> 
>>> Am Fr., 6. Feb. 2026 um 15:55 Uhr schrieb Thorsten Leemhuis
>>> <regressions at leemhuis.info>:
>>>>
>>>> On 2/6/26 12:33, Denis Gessert wrote:
>>>>>
>>>>> I found this email chain while troubleshooting why my Levovo Duet
>>>>> (with the MT8183 chip) would not boot using any 6.18.* kernel.
>>>>>
>>>>> I can confirm that on my device the current stable 6.18.8 does not
>>>>> boot unless I revert the commit
>>>>>
>>>>> commit e72d63fa0563f8a6e98c10fed3a9ce74dc0536e6 (HEAD)
>>>>> Author: AngeloGioacchino Del Regno
>>>>> <angelogioacchino.delregno at collabora.com>
>>>>> Date:   Thu Jul 24 10:39:08 2025 +0200
>>>>>
>>>>>       arm64: dts: mediatek: mt8183: Migrate to display controller OF
>>>>> graph
>>>>>
>>>>> mentioned below. With the reverted commit the device boots as intended.
>>>>
>>>> There is a fix for it from Otto here that I guess should help
>>>> https://lore.kernel.org/lkml/20260106-mt8183-display-graph-v2-1-
>>>> e7e56054eef5 at abscue.de/
>>>>
>>>> Side note: lacks a stable tag and maybe should have been merged this
>>>> cycle instead of the next. But given that 6.19 is immanent it might be
>>>> good if this could be backported to 6.19.y once it landed in mainline.
>>>>
>>>>> PS: Apologies for the potential double-mail.
>>>> No worries, happens.
>>>>
>>>> Ciao, Thortsten
>>
>>
>>
>