From 15557da1c2814585d8184ecb327d43cca93dced0 Mon Sep 17 00:00:00 2001 From: Xiaoguang Xing Date: Wed, 4 Sep 2024 13:01:03 +0800 Subject: [PATCH] drm/amd/display: Support DRM_AMD_DC_FP on RISC-V RISC-V uses kernel_fpu_begin()/kernel_fpu_end() like several other architectures. Enabling hardware FP requires overriding the ISA string for the relevant compilation units. Signed-off-by: Samuel Holland Signed-off-by: Icenowy Zheng Signed-off-by: Han Gao --- drivers/gpu/drm/amd/display/Kconfig | 1 + drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 6 ++++-- drivers/gpu/drm/amd/display/dc/dml/Makefile | 6 ++++++ 3 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig index 901d1961b7392..90489b55efa74 100644 --- a/drivers/gpu/drm/amd/display/Kconfig +++ b/drivers/gpu/drm/amd/display/Kconfig @@ -9,6 +9,7 @@ config DRM_AMD_DC select SND_HDA_COMPONENT if SND_HDA_CORE # !CC_IS_CLANG: https://github.com/ClangBuiltLinux/linux/issues/1752 select DRM_AMD_DC_FP if (X86 || LOONGARCH || (PPC64 && ALTIVEC) || (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG)) + select DRM_AMD_DC_DCN if RISCV && FPU help Choose this option if you want to use the new display engine support for AMDGPU. This adds required support for Vega and diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c index 172aa10a8800f..53a7122ba98d5 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c @@ -35,6 +35,8 @@ #include #elif defined(CONFIG_LOONGARCH) #include +#elif defined(CONFIG_RISCV) +#include #endif /** @@ -90,7 +92,7 @@ void dc_fpu_begin(const char *function_name, const int line) *pcpu += 1; if (*pcpu == 1) { -#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH) +#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH) || defined(CONFIG_RISCV) migrate_disable(); kernel_fpu_begin(); #elif defined(CONFIG_PPC64) @@ -130,7 +132,7 @@ void dc_fpu_end(const char *function_name, const int line) pcpu = get_cpu_ptr(&fpu_recursion_depth); *pcpu -= 1; if (*pcpu <= 0) { -#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH) +#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH) || defined(CONFIG_RISCV) kernel_fpu_end(); migrate_enable(); #elif defined(CONFIG_PPC64) diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile index 0ba9a7997d561..3cdd0c9ba8ffc 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile @@ -43,6 +43,12 @@ dml_ccflags := -mfpu=64 dml_rcflags := -msoft-float endif +ifdef CONFIG_RISCV +include $(srctree)/arch/riscv/Makefile.isa +# Remove V from the ISA string, like in arch/riscv/Makefile, but keep F and D. +dml_ccflags := -march=$(subst v,,$(riscv-march-y)) +endif + ifdef CONFIG_CC_IS_GCC ifneq ($(call gcc-min-version, 70100),y) IS_OLD_GCC = 1