Hi Dan, [ Cc += linuxppc-dev ] Dan Horák <dan@xxxxxxxx> writes: > Commit d11219ad53dc disabled the DCN driver for all platforms that > define PPC64 due long build issues during "make allmodconfig" using > cross-compilation. Cross-compilation defaults to the ppc64_defconfig > and thus big-endian toolchain configuration. The ppc64le platform uses a > different ABI and doesn't suffer from the build issues. Unfortunately it's a bit messier than that. The build error occurs when the compiler is built to use a 64-bit long double type. The ppc64le ABI document says that long double should be 128-bits, but there are ppc64le compilers out there that are configured to use 64-bit long double, notably the kernel.org crosstool compilers. So just testing for CPU_LITTLE_ENDIAN means we'll still get build errors on those compilers. But I think we can detect the long double size and key off that. Can you test the patch below works for you? cheers diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 7aa12e88c580..e9f8cd50af99 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -281,6 +281,9 @@ config PPC # Please keep this list sorted alphabetically. # +config PCC_LONG_DOUBLE_128 + def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1) + config PPC_BARRIER_NOSPEC bool default y diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig index b4029c0d5d8c..ec6771e87e73 100644 --- a/drivers/gpu/drm/amd/display/Kconfig +++ b/drivers/gpu/drm/amd/display/Kconfig @@ -6,7 +6,7 @@ config DRM_AMD_DC bool "AMD DC - Enable new display engine" default y select SND_HDA_COMPONENT if SND_HDA_CORE - select DRM_AMD_DC_DCN if (X86 || PPC64) && !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS) + select DRM_AMD_DC_DCN if (X86 || PPC_LONG_DOUBLE_128) && !(KCOV_INSTRUMENT_ALL && KCOV_ENABLE_COMPARISONS) help Choose this option if you want to use the new display engine support for AMDGPU. This adds required support for Vega and
