Re: [PATCH v3 2/2] arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850

[Alexey Klimov]

On Sat Sep 5, 2026 at 6:09 PM BST, Thomas Turner wrote:
> Add nodes for GPU (Mali Bifrost) to Exynos850. Does not provide support
> for temperature throttling, DVFS, power domains, governor support,

One of the sensors exposed via ACPM is "linked" to the GPU/G3D as far as
I know. The driver part was sent already and three sensors work there
(two cpu clusters and GPU).

I've never tested yet the DVFS of G3D via ACPM. Maybe it is worth a try
on A21s. But it should work the same way as clusters clocks.

> boosting and voltage control. Once PMIC is properly implemented, support
> will hopefully increase. However, the panfrost driver probes, the
> Mali-G52 GPU initializes and the core clock is set-up.
>
> Testing for this patch was done on a device not currently supported by
> linux, the Galaxy A21s. After enabling this node for that device
> locally, I was able to test and confirm basic GPU functionality. As of
> now, this patch has no users which have tested GPU capabilities and so
> the node has been set to "disabled".
>
> Here are some logs I pulled:
>
> panfrost 11500000.gpu: clock rate = 377000000
> panfrost 11500000.gpu: mali-g52 id 0x7212 major 0x0 minor 0x0 status 0x0
> panfrost 11500000.gpu: features: 00000000,00000df7, issues: 00000000,00000400
> panfrost 11500000.gpu: Features: L2:0x07100206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
> panfrost 11500000.gpu: shader_present=0x1 l2_present=0x1
> panfrost 11500000.gpu: [drm] Using Transparent Hugepage
> [drm] Initialized panfrost 1.6.0 for 11500000.gpu on minor 0
>
> OpenGL core profile vendor: Mesa
> OpenGL core profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL core profile version: 3.1 (Core Profile) Mesa 26.1.6
> OpenGL core profile shading language version: 1.40
> OpenGL compatibility profile vendor: Mesa
> OpenGL compatibility profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL compatibility profile version: 3.1 (Core Profile) Mesa 26.1.6
> OpenGL compatibility profile shading language version: 1.40
> OpenGL ES profile vendor: Mesa
> OpenGL ES profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL ES profile version: OpenGL ES 3.1 Mesa 26.1.6
> OpenGL ES profile shading language version: OpenGL ES GLSL ES 3.10
>
> Signed-off-by: Thomas Turner <tturner@xxxxxxxxxxxxx>

So, I've got A21s and installed pmOS to test all that.
My logs are slightly different but graphics is definitely alive:
[    0.200787] [drm] Initialized simpledrm 1.0.0 for fa000000.framebuffer on minor 0
[    0.215130] Console: switching to colour frame buffer device 90x100
[    0.225540] simple-framebuffer fa000000.framebuffer: [drm] fb0: simpledrmdrmfb frame buffer device
[    0.226134] panfrost 11500000.gpu: clock rate = 377000000
[    0.230960] panfrost 11500000.gpu: mali-g52 id 0x7212 major 0x0 minor 0x0 status 0x0
[    0.230981] panfrost 11500000.gpu: features: 00000000,00000df7, issues: 00000000,00000400
[    0.230991] panfrost 11500000.gpu: Features: L2:0x07100206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
[    0.231002] panfrost 11500000.gpu: shader_present=0x1 l2_present=0x1
[    0.232329] panfrost 11500000.gpu: [drm] Using Transparent Hugepage
[    0.232726] [drm] Initialized panfrost 1.6.0 for 11500000.gpu on minor 1

Also, when this is applied with status="okay" on Winlink board then
panfrost itself seems to be alive and drm initialises despite missing
regulator as indicated in my other email in v2 of this series, hence:

Reviewed-and-tested-by: Alexey Klimov <alexey.klimov@xxxxxxxxxx>

Thanks for working on this.
Best regareds,
Alexey