The patch titled
Subject: drm/amd/display: only use hard-float, not altivec on powerpc
has been added to the -mm mm-nonmm-unstable branch. Its filename is
drm-amd-display-only-use-hard-float-not-altivec-on-powerpc.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/drm-amd-display-only-use-hard-float-not-altivec-on-powerpc.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Subject: drm/amd/display: only use hard-float, not altivec on powerpc
Date: Fri, 29 Mar 2024 00:18:27 -0700
The compiler flags enable altivec, but that is not required; hard-float is
sufficient for the code to build and function.
Drop altivec from the compiler flags and adjust the enable/disable code to
only enable FPU use.
Link: https://lkml.kernel.org/r/20240329072441.591471-13-samuel.holland@xxxxxxxxxx
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nicolas Schier <nicolas@xxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: WANG Xuerui <git@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 12 ++----------
drivers/gpu/drm/amd/display/dc/dml/Makefile | 2 +-
drivers/gpu/drm/amd/display/dc/dml2/Makefile | 2 +-
3 files changed, 4 insertions(+), 12 deletions(-)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c~drm-amd-display-only-use-hard-float-not-altivec-on-powerpc
+++ a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
@@ -92,11 +92,7 @@ void dc_fpu_begin(const char *function_n
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_begin();
#elif defined(CONFIG_PPC64)
- if (cpu_has_feature(CPU_FTR_VSX_COMP))
- enable_kernel_vsx();
- else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
- enable_kernel_altivec();
- else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
+ if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
enable_kernel_fp();
#elif defined(CONFIG_ARM64)
kernel_neon_begin();
@@ -125,11 +121,7 @@ void dc_fpu_end(const char *function_nam
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_end();
#elif defined(CONFIG_PPC64)
- if (cpu_has_feature(CPU_FTR_VSX_COMP))
- disable_kernel_vsx();
- else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
- disable_kernel_altivec();
- else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
+ if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
disable_kernel_fp();
#elif defined(CONFIG_ARM64)
kernel_neon_end();
--- a/drivers/gpu/drm/amd/display/dc/dml2/Makefile~drm-amd-display-only-use-hard-float-not-altivec-on-powerpc
+++ a/drivers/gpu/drm/amd/display/dc/dml2/Makefile
@@ -30,7 +30,7 @@ dml2_ccflags := $(dml2_ccflags-y) -msse
endif
ifdef CONFIG_PPC64
-dml2_ccflags := -mhard-float -maltivec
+dml2_ccflags := -mhard-float
endif
ifdef CONFIG_ARM64
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile~drm-amd-display-only-use-hard-float-not-altivec-on-powerpc
+++ a/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -31,7 +31,7 @@ dml_ccflags := $(dml_ccflags-y) -msse
endif
ifdef CONFIG_PPC64
-dml_ccflags := -mhard-float -maltivec
+dml_ccflags := -mhard-float
endif
ifdef CONFIG_ARM64
_
Patches currently in -mm which might be from mpe@xxxxxxxxxxxxxx are
drm-amd-display-only-use-hard-float-not-altivec-on-powerpc.patch
