drm/amdgpu/display: Enable DC_FP for LoongArch

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@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig
index 06b4382..b015c7d 100644 (file)
--- 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
        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 || (ARM64 && KERNEL_MODE_NEON && !CC_IS_CLANG))
+       select DRM_AMD_DC_FP if (X86 || LOONGARCH || PPC64 || (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
        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 c42aa94..172aa10 100644 (file)
--- 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>
 #include <asm/cputable.h>
 #elif defined(CONFIG_ARM64)
 #include <asm/neon.h>

+#elif defined(CONFIG_LOONGARCH)
+#include <asm/fpu.h>

 #endif
 
 /**
 #endif
 
 /**


@@ -88,7 +90,7 @@ void dc_fpu_begin(const char *function_name, const int line)
        *pcpu += 1;
 
        if (*pcpu == 1) {
        *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)
                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) {
        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)
                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 01db035..77cf554 100644 (file)
--- 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
 
 dml_rcflags := -mgeneral-regs-only
 endif
 

+ifdef CONFIG_LOONGARCH
+dml_ccflags := -mfpu=64
+dml_rcflags := -msoft-float
+endif
+

 ifdef CONFIG_CC_IS_GCC
 ifneq ($(call gcc-min-version, 70100),y)
 IS_OLD_GCC = 1
 ifdef CONFIG_CC_IS_GCC
 ifneq ($(call gcc-min-version, 70100),y)
 IS_OLD_GCC = 1