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| author | Alex Deucher <alexander.deucher@amd.com> | 2021-01-04 19:24:20 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-01-05 19:35:53 +0300 |
| commit | 88d5cb2517a7190d0f51cabbdb2a1e7594bfec21 (patch) | |
| tree | aaf1e43a882ee9b2d6b336eb2eb8b5aae203589f /drivers/gpu/drm/amd/display/dc/calcs | |
| parent | 3e7bc83e312e666c648ccda84c745f909fae2256 (diff) | |
| download | linux-88d5cb2517a7190d0f51cabbdb2a1e7594bfec21.tar.xz | |
drm/amdgpu/display: drop DCN support for aarch64
From Ard:
"Simply disabling -mgeneral-regs-only left and right is risky, given that
the standard AArch64 ABI permits the use of FP/SIMD registers anywhere,
and GCC is known to use SIMD registers for spilling, and may invent
other uses of the FP/SIMD register file that have nothing to do with the
floating point code in question. Note that putting kernel_neon_begin()
and kernel_neon_end() around the code that does use FP is not sufficient
here, the problem is in all the other code that may be emitted with
references to SIMD registers in it.
So the only way to do this properly is to put all floating point code in
a separate compilation unit, and only compile that unit with
-mgeneral-regs-only."
Disable support until the code can be properly refactored to support this
properly on aarch64.
Acked-by: Will Deacon <will@kernel.org>
Reported-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/calcs')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/calcs/Makefile | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile index 64f515d74410..f3c00f479e1c 100644 --- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile +++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile @@ -33,10 +33,6 @@ ifdef CONFIG_PPC64 calcs_ccflags := -mhard-float -maltivec endif -ifdef CONFIG_ARM64 -calcs_rcflags := -mgeneral-regs-only -endif - ifdef CONFIG_CC_IS_GCC ifeq ($(call cc-ifversion, -lt, 0701, y), y) IS_OLD_GCC = 1 |