Is linux 5.10 support possible?

[thenightterorx]

I want to see how this device would fare on a sbc called the "milk-v duo," but that board currently only supports linux 5.10.4.
I know very little about c programming, so even just a pointer (no pun intended) would help a lot.

lee@archlinux ~/ms912x (main)> make -C /lib/modules/5.10.194-1-lts510/build/ M=$PWD CC [M] /home/lee/ms912x/ms912x_transfer.o In file included from /home/lee/ms912x/ms912x_transfer.c:7: /home/lee/ms912x/ms912x.h:113:47: warning: ‘struct dma_buf_map’ declared inside parameter list will not be visible outside of this definition or declaration 113 | const struct dma_buf_map *map, | ^~~~~~~~~~~ /home/lee/ms912x/ms912x_transfer.c:160:47: warning: ‘struct dma_buf_map’ declared inside parameter list will not be visible outside of this definition or declaration 160 | const struct dma_buf_map *map, | ^~~~~~~~~~~ /home/lee/ms912x/ms912x_transfer.c:159:6: error: conflicting types for ‘ms912x_fb_send_rect’; have ‘void(struct drm_framebuffer *, const struct dma_buf_map *, struct drm_rect *)’ 159 | void ms912x_fb_send_rect(struct drm_framebuffer *fb, | ^~~~~~~~~~~~~~~~~~~ /home/lee/ms912x/ms912x.h:112:6: note: previous declaration of ‘ms912x_fb_send_rect’ with type ‘void(struct drm_framebuffer *, const struct dma_buf_map *, struct drm_rect *)’ 112 | void ms912x_fb_send_rect(struct drm_framebuffer *fb, | ^~~~~~~~~~~~~~~~~~~ /home/lee/ms912x/ms912x_transfer.c: In function ‘ms912x_fb_send_rect’: /home/lee/ms912x/ms912x_transfer.c:164:26: error: invalid use of undefined type ‘const struct dma_buf_map’ 164 | void *vaddr = map->vaddr; | ^~ /home/lee/ms912x/ms912x_transfer.c:195:15: error: implicit declaration of function ‘drm_gem_fb_begin_cpu_access’; did you mean ‘dma_buf_begin_cpu_access’? [-Werror=implicit-function-declaration] 195 | ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | dma_buf_begin_cpu_access /home/lee/ms912x/ms912x_transfer.c:237:9: error: implicit declaration of function ‘drm_gem_fb_end_cpu_access’; did you mean ‘dma_buf_end_cpu_access’? [-Werror=implicit-function-declaration] 237 | drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); | ^~~~~~~~~~~~~~~~~~~~~~~~~ | dma_buf_end_cpu_access cc1: some warnings being treated as errors make[1]: *** [scripts/Makefile.build:286: /home/lee/ms912x/ms912x_transfer.o] Error 1 make: *** [Makefile:1832: /home/lee/ms912x] Error 2

[rhgndf]

Branch kernel-5.10 might work. I had crashes with the branch, but this might be still useful for you.

[thenightterorx]

I am getting this when trying to build the latest:
CC [M] /home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_registers.o
CC [M] /home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_connector.o
CC [M] /home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_transfer.o
/home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_transfer.c: In function ‘ms912x_fb_send_rect’:
/home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_transfer.c:154:23: error: ‘map’ undeclared (first use in this function); did you mean ‘vmap’?
154 | void *vaddr = map->vaddr;
| ^~~
| vmap
/home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_transfer.c:154:23: note: each undeclared identifier is reported only once for each function it appears in
make[1]: *** [scripts/Makefile.build:286: /home/lee/modules/5.10/ms912x-kernel-5.10/ms912x_transfer.o] Error 1
make: *** [Makefile:1832: /home/lee/modules/5.10/ms912x-kernel-5.10] Error 2