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drm/amd/display: Allow building DC with clang on LoongArch

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Clang on LoongArch (18+) appears to be unaffected by the bug causing
excessive stack usage in calculate_bandwidth(). But when building DC_FP
support the stack frame size can be as large as 2816 bytes, which causes
the FRAME_WARN build warnings. So on LoongArch we allow building DC with
clang, but disable DC_FP by default.

The help message is also updated.

Tested-by: Rui Wang <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Huacai Chen
2024-11-15 23:02:25 +08:00
committed by Alex Deucher
parent 2bc96c9507
commit 4217ef9ab7
1 changed files with 8 additions and 7 deletions
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15
drivers/gpu/drm/amd/display/Kconfig
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@@ -7,20 +7,21 @@ menu "Display Engine Configuration"
config DRM_AMD_DC
bool "AMD DC - Enable new display engine"
default y
depends on BROKEN || !CC_IS_CLANG || ARM64 || RISCV || SPARC64 || X86_64
depends on BROKEN || !CC_IS_CLANG || ARM64 || LOONGARCH || RISCV || SPARC64 || X86_64
select SND_HDA_COMPONENT if SND_HDA_CORE
# !CC_IS_CLANG: https://github.com/ClangBuiltLinux/linux/issues/1752
select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && !(CC_IS_CLANG && (ARM64 || RISCV))
select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && !(CC_IS_CLANG && (ARM64 || LOONGARCH || RISCV))
help
Choose this option if you want to use the new display engine
support for AMDGPU. This adds required support for Vega and
Raven ASICs.
calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64 || ARM64)
architectures built with Clang (all released versions), whereby the stack
frame gets blown up to well over 5k. This would cause an immediate kernel
panic on most architectures. We'll revert this when the following bug report
has been resolved: https://github.com/llvm/llvm-project/issues/41896.
calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64 ||
ARM64 || LOONGARCH || RISCV) architectures built with Clang (all released
versions), whereby the stack frame gets blown up to well over 5k. This
would cause an immediate kernel panic on most architectures. We'll revert
this when the following bug report has been resolved:
https://github.com/llvm/llvm-project/issues/41896.
config DRM_AMD_DC_FP
def_bool n