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authorNick Desaulniers <ndesaulniers@google.com>2019-07-22 15:31:05 -0700
committerAlex Deucher <alexander.deucher@amd.com>2019-07-30 23:18:33 -0500
commit0f0727d971f6fdf8f1077180d495ddb9928f0c8b (patch)
treec8a1ce04004038ef7e4ff58a72b472923050f66b /drivers/gpu/drm/amd/display/dc
parent4cab85afe9d7903936ef86ef143e37440cb8fc98 (diff)
drm/amd/display: readd -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines
arch/x86/Makefile disables SSE and SSE2 for the whole kernel. The AMDGPU drivers modified in this patch re-enable SSE but not SSE2. Turn on SSE2 to support emitting double precision floating point instructions rather than calls to non-existent (usually available from gcc_s or compiler_rt) floating point helper routines for Clang. This was originally landed in: commit 10117450735c ("drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines") but reverted in: commit 193392ed9f69 ("Revert "drm/amd/display: add -msse2 to prevent Clang from emitting libcalls to undefined SW FP routines"") due to bugreports from GCC builds. Add guards to only do so for Clang. Link: https://bugs.freedesktop.org/show_bug.cgi?id=109487 Link: https://github.com/ClangBuiltLinux/linux/issues/327 Suggested-by: Sedat Dilek <sedat.dilek@gmail.com> Suggested-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc')
-rw-r--r--drivers/gpu/drm/amd/display/dc/calcs/Makefile4
-rw-r--r--drivers/gpu/drm/amd/display/dc/dcn20/Makefile4
-rw-r--r--drivers/gpu/drm/amd/display/dc/dml/Makefile4
-rw-r--r--drivers/gpu/drm/amd/display/dc/dsc/Makefile4
4 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
index 95f332ee3e7e..16614d73a5fc 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@ -32,6 +32,10 @@ endif
calcs_ccflags := -mhard-float -msse $(cc_stack_align)
+ifdef CONFIG_CC_IS_CLANG
+calcs_ccflags += -msse2
+endif
+
CFLAGS_dcn_calcs.o := $(calcs_ccflags)
CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
CFLAGS_dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
index e9721a906592..f57a3b281408 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
@@ -18,6 +18,10 @@ endif
CFLAGS_dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
+ifdef CONFIG_CC_IS_CLANG
+CFLAGS_dcn20_resource.o += -msse2
+endif
+
AMD_DAL_DCN20 = $(addprefix $(AMDDALPATH)/dc/dcn20/,$(DCN20))
AMD_DISPLAY_FILES += $(AMD_DAL_DCN20)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index 1735fc1e2eb1..95fd2beca80c 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -32,6 +32,10 @@ endif
dml_ccflags := -mhard-float -msse $(cc_stack_align)
+ifdef CONFIG_CC_IS_CLANG
+dml_ccflags += -msse2
+endif
+
CFLAGS_display_mode_lib.o := $(dml_ccflags)
ifdef CONFIG_DRM_AMD_DC_DCN2_0
diff --git a/drivers/gpu/drm/amd/display/dc/dsc/Makefile b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
index e019cd9447e8..17db603f2d1f 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
@@ -9,6 +9,10 @@ endif
dsc_ccflags := -mhard-float -msse $(cc_stack_align)
+ifdef CONFIG_CC_IS_CLANG
+dsc_ccflags += -msse2
+endif
+
CFLAGS_rc_calc.o := $(dsc_ccflags)
CFLAGS_rc_calc_dpi.o := $(dsc_ccflags)
CFLAGS_codec_main_amd.o := $(dsc_ccflags)