[PATCH] drm/amdgpu/display: fix CFLAGS setup for DCN30

[Nirmoy]

Acked-by: Nirmoy Das <nirmoy.das at amd.com>

On 9/22/20 5:36 PM, Alex Deucher wrote:
> Properly handle clang and older versions of gcc.
>
> Fixes: e77165bf7b02a3 ("drm/amd/display: Add DCN3 blocks to Makefile")
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>   drivers/gpu/drm/amd/display/dc/dcn30/Makefile | 18 ++++++++++++++++--
>   1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> index 025637a83c3b..bd2a068f9863 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> @@ -31,9 +31,21 @@ DCN30 = dcn30_init.o dcn30_hubbub.o dcn30_hubp.o dcn30_dpp.o dcn30_optc.o \
>   	dcn30_dio_link_encoder.o dcn30_resource.o
>   
>   
> -CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mhard-float -msse -mpreferred-stack-boundary=4
> -
> +ifdef CONFIG_X86
>   CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o := -mhard-float -msse
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mhard-float -msse
> +endif
> +
> +ifdef CONFIG_PPC64
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o := -mhard-float -maltivec
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mhard-float -maltivec
> +endif
> +
> +ifdef CONFIG_ARM64
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o := -mgeneral-regs-only
> +CFLAGS_REMOVE_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mgeneral-regs-only
> +endif
> +
>   ifdef CONFIG_CC_IS_GCC
>   ifeq ($(call cc-ifversion, -lt, 0701, y), y)
>   IS_OLD_GCC = 1
> @@ -45,8 +57,10 @@ ifdef IS_OLD_GCC
>   # GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
>   # (8B stack alignment).
>   CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o += -mpreferred-stack-boundary=4
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o += -mpreferred-stack-boundary=4
>   else
>   CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o += -msse2
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o += -msse2
>   endif
>   
>   AMD_DAL_DCN30 = $(addprefix $(AMDDALPATH)/dc/dcn30/,$(DCN30))