Hi Maíra,
[add Phil & Dave]
Am 12.04.24 um 15:25 schrieb Maíra Canal:
RPi 0-3 is packed with a GPU that provides 3D rendering capabilities to
the RPi. Currently, the downstream kernel uses an overlay to enable the
GPU and use GPU hardware acceleration. When deploying a mainline kernel
to the RPi 0-3, we end up without any GPU hardware acceleration
(essentially, we can't use the OpenGL driver).
Therefore, enable the V3D core for the RPi 0-3 in the mainline kernel.
thanks for trying to improve the combination Raspberry Pi OS + Mainline
Kernel. I think i'm able to reproduce the issue with Raspberry Pi 3 B +
on Buster. From the kernel side everything looks good:
[ 11.054833] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
[ 11.055118] vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
[ 11.055340] vc4-drm soc:gpu: bound 3f004000.txp (ops vc4_txp_ops [vc4])
[ 11.055521] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops
vc4_crtc_ops [vc4])
[ 11.055695] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops
vc4_crtc_ops [vc4])
[ 11.055874] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops
vc4_crtc_ops [vc4])
[ 11.056020] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
[ 11.063277] Bluetooth: hci0: BCM4345C0
'brcm/BCM4345C0.raspberrypi,3-model-b-plus.hcd' Patch
[ 11.070466] [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
[ 11.174803] Console: switching to colour frame buffer device 240x75
[ 11.205125] vc4-drm soc:gpu: [drm] fb0: vc4drmfb frame buffer device
But in Raspberry Pi OS there is a systemd script which is trying to
check for the V3D driver /usr/lib/systemd/scripts/gldriver_test.sh
Within the first check "raspi-config nonint is_kms" is called, which
always seems to fail. If i run strace on this command it seems to check
for /proc/device-tree/soc/v3d@7ec00000/status which doesn't exists in
the Mainline device tree.
Maybe there is a chance to improve the userspace tool?
Signed-off-by: Maíra Canal <mcanal@xxxxxxxxxx>
---
I decided to add the status property to the `bcm2835-common.dtsi`, but
there are two other options:
1. To add the status property to the `bcm2835-rpi-common.dtsi` file
2. To add the status property to each individual RPi model, e.g.
`bcm2837-rpi-3-b.dts`.
Let me know which option is more suitable, and if `bcm2835-common.dtsi`
is not the best option, I can send a v2.
Best Regards,
- Maíra
arch/arm/boot/dts/broadcom/bcm2835-common.dtsi | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/broadcom/bcm2835-common.dtsi b/arch/arm/boot/dts/broadcom/bcm2835-common.dtsi
index 9261b67dbee1..851a6bce1939 100644
--- a/arch/arm/boot/dts/broadcom/bcm2835-common.dtsi
+++ b/arch/arm/boot/dts/broadcom/bcm2835-common.dtsi
@@ -139,6 +139,7 @@ v3d: v3d@7ec00000 {
compatible = "brcm,bcm2835-v3d";
reg = <0x7ec00000 0x1000>;
interrupts = <1 10>;
+ status = "okay";
};
vc4: gpu {
