Re: [V3] drm/amdgpu/display: Enable DC_FP for LoongArch

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Hi,

On 2023/5/8 11:09, Huacai Chen wrote:
LoongArch now provides kernel_fpu_begin() and kernel_fpu_end() that are
used like the x86 counterparts in commit 2b3bd32ea3a22ea2d ("LoongArch:
Provide kernel fpu functions"), so we can enable DC_FP on LoongArch for
supporting more DCN devices.

Signed-off-by: WANG Xuerui <kernel@xxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>


Tested-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>


---
V2: Update commit message to add the commit which provides kernel fpu
     functions.
V3: Update commit message again and rebase on the latest code.

  drivers/gpu/drm/amd/display/Kconfig            | 2 +-
  drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 6 ++++--
  drivers/gpu/drm/amd/display/dc/dml/Makefile    | 5 +++++
  3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig
index 2d8e55e29637..49df073962d5 100644
--- a/drivers/gpu/drm/amd/display/Kconfig
+++ b/drivers/gpu/drm/amd/display/Kconfig
@@ -8,7 +8,7 @@ config DRM_AMD_DC
  	depends on BROKEN || !CC_IS_CLANG || X86_64 || SPARC64 || ARM64
  	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 || (PPC64 && ALTIVEC) || (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG))
+	select DRM_AMD_DC_FP if (X86 || LOONGARCH || (PPC64 && ALTIVEC) || (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG))
  	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 c42aa947c969..172aa10a8800 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
@@ -33,6 +33,8 @@
  #include <asm/cputable.h>
  #elif defined(CONFIG_ARM64)
  #include <asm/neon.h>
+#elif defined(CONFIG_LOONGARCH)
+#include <asm/fpu.h>
  #endif
/**
@@ -88,7 +90,7 @@ void dc_fpu_begin(const char *function_name, const int line)
  	*pcpu += 1;
if (*pcpu == 1) {
-#if defined(CONFIG_X86)
+#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
  		migrate_disable();
  		kernel_fpu_begin();
  #elif defined(CONFIG_PPC64)
@@ -128,7 +130,7 @@ 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)
+#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
  		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 01db035589c5..77cf5545c94c 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -38,6 +38,11 @@ ifdef CONFIG_ARM64
  dml_rcflags := -mgeneral-regs-only
  endif
+ifdef CONFIG_LOONGARCH
+dml_ccflags := -mfpu=64
+dml_rcflags := -msoft-float
+endif
+
  ifdef CONFIG_CC_IS_GCC
  ifneq ($(call gcc-min-version, 70100),y)
  IS_OLD_GCC = 1

--
Jingfeng




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