Request for Information on the current drm radeon Atomic Mode Settings

[Deucher, Alexander]

[Public]

The radeon driver does not support atomic modesetting.  It was largely written before atomic existed.  Converting it to atomic would be a substantial undertaking that would potentially regress a lot of really old chips.  Radeon supports hardware that is 25+ years old at this point.

Alex

From: Mauro Rossi <issor.oruam at gmail.com>
Sent: Friday, May 17, 2024 7:28 AM
To: amd-gfx list <amd-gfx at lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; lee at kernel.org; Michael Goffioul <michael.goffioul at gmail.com>; Jon West <electrikjesus at gmail.com>; youling 257 <youling257 at gmail.com>
Subject: Re: Request for Information on the current drm radeon Atomic Mode Settings

Cc: correct email address of Lee Jones, just For Your Information

Updated [2] link URL because HWC3 in Celadon was moved to project Celadon drm-hwcomposer local branch on yesterday

The request for information on drm radeon atomic modesettings is confirmed

Mauro

On Fri, May 17, 2024 at 8:31 AM Mauro Rossi <issor.oruam at gmail.com<mailto:issor.oruam at gmail.com>> wrote:
Hi all,

with Android 14 QPR2 there were substantial changes in graphic stack's Android HAL (Hardware Abstraction Layer),
essentially it became mandatory that hwcomposer HAL module supports AIDL Android Interface Definition Language,

at the moment drm_hwcomposer does not support AIDL [1]

Project Celadon has an HWC3 AIDL implemented [2], as a patch on top of hardware/interface AOSP project, there is an opportunity to use it also for non Intel GPUs.

drm amdpu in kernel already supports ADF Atomic Display Framework, I would like to ask the current status of Atomic Display Framework in drm radeon, because Atomic Mode Settings seems partially implemented since 2010-2012, but ADF capabilities are not exposed to user space.

Please, I also need some basic (high level) information about the outstanding changes that would be required to support it, in order to be able to use HWC3 -> drm_hwcomposer with r600, r300 chipsets.

Thanks for your informations

Mauro
android-x86 team/Bliss-OS community

[1] https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer/-/issues/80
[2] https://github.com/projectceladon/vendor-intel-utils/blob/master/aosp_diff/preliminary/hardware/interfaces/11_0001-Enable-graphics.composer3-AIDL-HAL-service.patch

[2] https://github.com/projectceladon/drm-hwcomposer/commit/1160cdfb53daebf59f3704ec9586c66385e63747
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