Re: [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

Re: [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

[Thorsten Leemhuis]

On 2/16/26 11:46, AngeloGioacchino Del Regno wrote:
> 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.
>>> 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.

Hi stable team! Could you please pick up be0b304eeb8c5f ("arm64: dts:
mediatek: mt8183: Add missing endpoint IDs to display graph") [merged
v6.19-post, committed by Angelo, who ACKed this request; see quote
above] for 6.18.y and 6.19.y? It fixes a regression in e72d63fa0563
("arm64: dts: mediatek: mt8183: Migrate to display controller OF
graph"). tia! Ciao, Thorsten

>>>> Am Fr., 6. Feb. 2026 um 15:55 Uhr schrieb Thorsten Leemhuis
>>>> <regressions@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@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@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
>>>
>>>
>>>
>>
> 
> 
> 

Re: [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

[Greg KH]

On Tue, Feb 17, 2026 at 09:18:00AM +0100, Thorsten Leemhuis wrote:
> On 2/16/26 11:46, AngeloGioacchino Del Regno wrote:
> > 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.
> >>> 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.
> 
> Hi stable team! Could you please pick up be0b304eeb8c5f ("arm64: dts:
> mediatek: mt8183: Add missing endpoint IDs to display graph") [merged
> v6.19-post, committed by Angelo, who ACKed this request; see quote
> above] for 6.18.y and 6.19.y? It fixes a regression in e72d63fa0563
> ("arm64: dts: mediatek: mt8183: Migrate to display controller OF
> graph"). tia! Ciao, Thorsten

Now queued up, thanks.

greg k-h