Hello everyone, Recently I got a SBSA ARM64 workstation, and try to use it as my daily drive machine after installing an AMD RX6400 graphics card. Since the newer AMD GPUs require DCN (Display Core Next) support to work properly, DCN is not supported on ARM64 platforms. Because some code in DCN needs to use FPU, and aarch64 has no soft floating-point toolchain. Displaycore developers have started isolating code that needs to use FPU, and most of the code has been isolated. In the process of trying to enable DCN support for the ARM64 platform, I found that there are two remaining code blocks that are not isolated. Due to -mgeneral-regs-only is enabled by default to compile the kernel on the ARM64 platform, these two code blocks will cause the compilation to fail after enabling DCN support. I have submitted two patches to isolate the remaining two code blocks that need to use the FPU. Links: https://patchwork.freedesktop.org/patch/508813/ Links: https://patchwork.freedesktop.org/patch/508816/ After merging these two patches, we can enable DCN support for ARM64 platform. I removed -mgeneral-regs-only CFLAG in the dml/Makefile for the code that needs to use hardware FPU, and add a control mechanism in amdgpu_dm/dc_fpu.c for ARM Neon. Change Since V2: - Drop CONFIG_DRM_AMD_DC_DCN check when initializing the dml_rcflags for ARM64 - Drop CONFIG_ARM64 and CONFIG_DRM_AMD_DC_DCN check for the per-file cflags list entirely Change Since V1: - replace $(dml_rcflags_arm64) with $(dml_rcflags) in dml/Makefile Ao Zhong (1): drm/amd/display: add DCN support for ARM64 drivers/gpu/drm/amd/display/Kconfig | 2 +- .../gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 6 ++++++ drivers/gpu/drm/amd/display/dc/dml/Makefile | 20 +++++++++++++++---- 3 files changed, 23 insertions(+), 5 deletions(-) -- 2.37.4
