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Sun, 06 Sep 2026 17:28:37 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 07 Sep 2026 01:28:36 +0100 Message-Id: From: "Alexey Klimov" To: "Thomas Turner" , , , , , Cc: , , , , , Subject: Re: [PATCH v3 2/2] arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850 X-Mailer: aerc 0.21.0 References: <20260905170914.1640-1-tturner@lineageos.org> <20260905170914.1640-3-tturner@lineageos.org> In-Reply-To: <20260905170914.1640-3-tturner@lineageos.org> 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 =3D 377000000 > panfrost 11500000.gpu: mali-g52 id 0x7212 major 0x0 minor 0x0 status 0x0 > panfrost 11500000.gpu: features: 00000000,00000df7, issues: 00000000,0000= 0400 > panfrost 11500000.gpu: Features: L2:0x07100206 Shader:0x00000000 Tiler:0x= 00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7 > panfrost 11500000.gpu: shader_present=3D0x1 l2_present=3D0x1 > 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 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 o= n minor 0 [ 0.215130] Console: switching to colour frame buffer device 90x100 [ 0.225540] simple-framebuffer fa000000.framebuffer: [drm] fb0: simpledr= mdrmfb frame buffer device [ 0.226134] panfrost 11500000.gpu: clock rate =3D 377000000 [ 0.230960] panfrost 11500000.gpu: mali-g52 id 0x7212 major 0x0 minor 0x= 0 status 0x0 [ 0.230981] panfrost 11500000.gpu: features: 00000000,00000df7, issues: = 00000000,00000400 [ 0.230991] panfrost 11500000.gpu: Features: L2:0x07100206 Shader:0x0000= 0000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7 [ 0.231002] panfrost 11500000.gpu: shader_present=3D0x1 l2_present=3D0x1 [ 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=3D"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 Thanks for working on this. Best regareds, Alexey