[PATCH v4 0/2] Exynos850 GPU support

[PATCH v4 0/2] Exynos850 GPU support

[Thomas Turner]

This patch series documents and provides basic GPU support for the
Exynos850 SoC, making use of the Mali G52 GPU through the panfrost
driver. Only basic support is provided here and as such lots of features
are missing. This series only adds the GPU node for the Exynos850 SoC
dtsi, but keeps it disabled, so it stays disabled currently on E850-96
board (The only user of the Exynos850 SoC dtsi upstream).

Thomas Turner (2):
  dt-bindings: gpu: arm,mali-bifrost: add exynos850-mali compatible
  arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850

 .../devicetree/bindings/gpu/arm,mali-bifrost.yaml   |  1 +
 arch/arm64/boot/dts/exynos/exynos850.dtsi           | 13 +++++++++++++
 2 files changed, 14 insertions(+)

-- 
2.47.3

[PATCH v4 1/2] dt-bindings: gpu: arm,mali-bifrost: add exynos850-mali compatible

[Thomas Turner]

Exynos850 SoC uses the ARM Mali G52 GPU, document its compatible
string with the appropriate fallback.

Signed-off-by: Thomas Turner <tturner@lineageos.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
---
Changes in v4:
  - no changes

Changes in v3:
  - Add Acked-by tag

Changes in v2:
  - Introduce this patch

 Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
index 9db9f84ad964..ece2b637cd41 100644
--- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
@@ -34,6 +34,7 @@ properties:
               - rockchip,rk3562-mali
               - rockchip,rk3568-mali
               - rockchip,rk3576-mali
+              - samsung,exynos850-mali
           - const: arm,mali-bifrost # Mali Bifrost GPU model/revision is fully discoverable
       - items:
           - enum:
-- 
2.47.3

[PATCH v4 2/2] arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850

[Thomas Turner]

Add nodes for GPU (Mali Bifrost) to Exynos850. Does not provide support
for temperature throttling, DVFS, power domains, governor support,
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@lineageos.org>
Reviewed-and-tested-by: Alexey Klimov <alexey.klimov@linaro.org>
---
Changes in v4:
  - Add Reviewed-and-tested-by tag

Changes in v3:
  - Re-word commit message to be less ambiguous
  - Provide some logs in the commit message
  - Add a blank line before status property

Changes in v2:
  - Add a patch addressing the samsung,exynos850-mali compatible string

 arch/arm64/boot/dts/exynos/exynos850.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
index 911643008b9f..721b2b2c4ffb 100644
--- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
@@ -310,6 +310,19 @@ cmu_g3d: clock-controller@11400000 {
 			clock-names = "oscclk", "dout_g3d_switch";
 		};
 
+		gpu: gpu@11500000 {
+			compatible = "samsung,exynos850-mali", "arm,mali-bifrost";
+			reg = <0x11500000 0x5000>;
+			interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "job", "mmu", "gpu";
+			clocks = <&cmu_g3d CLK_GOUT_G3D_GPU_CLK>;
+			clock-names = "core";
+
+			status = "disabled";
+		};
+
 		cmu_apm: clock-controller@11800000 {
 			compatible = "samsung,exynos850-cmu-apm";
 			reg = <0x11800000 0x8000>;
-- 
2.47.3

Re: [PATCH v4 2/2] arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850

[Sam Protsenko]

On Wed, Sep 9, 2026 at 2:45 PM Thomas Turner <tturner@lineageos.org> wrote:
>
> Add nodes for GPU (Mali Bifrost) to Exynos850. Does not provide support
> for temperature throttling, DVFS, power domains, governor support,
> 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@lineageos.org>
> Reviewed-and-tested-by: Alexey Klimov <alexey.klimov@linaro.org>
> ---
> Changes in v4:
>   - Add Reviewed-and-tested-by tag
>

If adding the tags is the only change in v4 patch series, there was no
need to submit v4. When maintainers apply your patches they collect
all tags from the latest patch version themselves. So you only need to
collect the tags from the previous version review if you want to
submit the next version for some actual reasons (not just for merely
collecting the tags). Sorry if I forgot to explain it clearly.

> Changes in v3:
>   - Re-word commit message to be less ambiguous
>   - Provide some logs in the commit message
>   - Add a blank line before status property
>
> Changes in v2:
>   - Add a patch addressing the samsung,exynos850-mali compatible string
>
>  arch/arm64/boot/dts/exynos/exynos850.dtsi | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> index 911643008b9f..721b2b2c4ffb 100644
> --- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> @@ -310,6 +310,19 @@ cmu_g3d: clock-controller@11400000 {
>                         clock-names = "oscclk", "dout_g3d_switch";
>                 };
>
> +               gpu: gpu@11500000 {
> +                       compatible = "samsung,exynos850-mali", "arm,mali-bifrost";
> +                       reg = <0x11500000 0x5000>;
> +                       interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>,
> +                                    <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>,
> +                                    <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
> +                       interrupt-names = "job", "mmu", "gpu";
> +                       clocks = <&cmu_g3d CLK_GOUT_G3D_GPU_CLK>;
> +                       clock-names = "core";
> +
> +                       status = "disabled";
> +               };
> +
>                 cmu_apm: clock-controller@11800000 {
>                         compatible = "samsung,exynos850-cmu-apm";
>                         reg = <0x11800000 0x8000>;
> --
> 2.47.3
>