Star64: GPU firmware loading on Armbian

[mara]

GPU firmware loading fails on armbian:

Code:

[    0.698528] PVR_K:(Fatal):    1: All RGX Firmware image loads failed for 'rgx.fw.36.50.54.182' (PVRSRV_ERROR_NOT_FOUND) [1599]
[    0.698565] PVR_K:(Error):    1: RGXInit: InitFirmware failed (275) [1556]
[    0.698592] PVR_K:(Error):    1: RGXInit() failed (PVRSRV_ERROR_NOT_FOUND) in PVRSRVCommonDeviceInitialise() [2156]
[    0.698626] PVR_K:(Error):    1: PVRSRVDeviceFinalise() failed (PVRSRV_ERROR_NOT_INITIALISED) in PVRSRVCommonDeviceInitialise() [2170]
[    0.698664] [drm:pvr_drm_load] *ERROR* device (____ptrval____) initialisation failed (err=-19)

This is probably a first step in having GPU support in Xorg and Wayland.

Apply this kernel patch

Code:

schaecsn@pc:~/risc/linux# git diff drivers/gpu/drm/img/img-rogue/Kconfig
diff --git a/drivers/gpu/drm/img/img-rogue/Kconfig b/drivers/gpu/drm/img/img-rogue/Kconfig
index 5b793bb9da0e..6f84a2643e02 100644
--- a/drivers/gpu/drm/img/img-rogue/Kconfig
+++ b/drivers/gpu/drm/img/img-rogue/Kconfig
@@ -1,5 +1,5 @@
config DRM_IMG_ROGUE
-      bool "DRM support for PowerVR GPU"
+      tristate "DRM support for PowerVR GPU"
        select DRM_IMG
        default n
        help

Configure the gpu driver as a module

Code:

schaecsn@pc:~/riscv/linux$ scripts/config -m CONFIG_DRM_IMG_ROGUE

Rebuild the kernel and modules and install them.

The driver needs to be compiled as a kernel module. Unsophisticated guess: that moves out the initialization of the gpu from initrd into systemd-land. That is why the firmware does not need to be in initrd but can reside on the /-filesystem.

The two firmware blobs rgx.fw.36.50.54.182  rgx.sh.36.50.54.182 need to be moved into /lib/firmware/ directory. They come from starfive-'s github repro https://media.githubusercontent.com/medi...866.tar.gz

Code:

schaecsn@star64:~$ sudo mv img-gpu-powervr-bin-1.17.6210866/target/lib/firmware/* /lib/firmware/

A reboot shows successful firmware load

Code:

[  26.414834] PVR_K:  362: Read BVNC 36.50.54.182 from HW device registers
[  26.414879] PVR_K:  362: RGX Device registered BVNC 36.50.54.182 with 1 core in the system
[  26.422574] PVR_K:  362: RGX Firmware image 'rgx.fw.36.50.54.182' loaded
[  26.442903] PVR_K:  362: Shader binary image 'rgx.sh.36.50.54.182' loaded

Th next step in having GPU support in Xorg and Wayland is probably installing the libs, bin, and headers from said img-gpu-powervr-bin-1.17.6210866.tar.gz "[this] is a GPU library packages from Imagination and provide GPU firmware, libOpenCL, vulkan, gles2, gles3. This library is not open source, only provide with binary library." I have not tried that.

This is where you are going to have lots of "fun" - GPU support requires tons of patches to various userland apps, including mesa, wayland, apps etc to correctly use the GPU. The challenge is the patches starfive distribute are for older versions of userspace, namely mesa, that don't apply to current mainline (same issue for VPU as well). I tried to build GPU acceleration initially on debian, but ran in version dependency nightmares... newer apps wont compile against older mesa versions etc etc etc. I gave up and went with yocto as its not as "fussy" about version dependencies and is easier to overcome

Xorg is going to be very "challenging", and i've not started on it yet, as wayland is easier go get running with GPU.

The setup in the form of a firmware module is loaded, but there is no output to the monitor, even to the console

Code:

[   38.232439] mailbox_test mailbox_client: Successfully registered
[   41.669558] @@ dev ptr:ffffffe0bfedac00/1500/1
[   41.669717] PVR_K:  272: Read BVNC 36.50.54.182 from HW device registers
[   41.669766] PVR_K:  272: RGX Device registered BVNC 36.50.54.182 with 1 core in the system
[   41.705177] PVR_K:  272: RGX Firmware image 'rgx.fw.36.50.54.182' loaded
[   41.728503] PVR_K:  272: Shader binary image 'rgx.sh.36.50.54.182' loaded
[   41.730429] [drm] Initialized pvr 1.19.6345021 20170530 for 18000000.gpu on minor 1
[   42.423200] device-mapper: ioctl: 4.45.0-ioctl (2021-03-22) initialised: dm-devel@redhat.