linux-kernel - [PATCH] drm/amd/display: Add missing hard-float compile flags for PPC64 builds

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Message-Id: <20220618232737.2036722-1-linux@roeck-us.net>
Date:   Sat, 18 Jun 2022 16:27:37 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Harry Wentland <harry.wentland@....com>
Cc:     Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Daniel Axtens <dja@...ens.net>
Subject: [PATCH] drm/amd/display: Add missing hard-float compile flags for PPC64 builds

ppc:allmodconfig builds fail with the following error.

powerpc64-linux-ld:
	drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o
		uses hard float,
	drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o
		uses soft float
powerpc64-linux-ld:
	failed to merge target specific data of file
	drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.o
powerpc64-linux-ld:
	drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o
		uses hard float,
	drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o
		uses soft float
powerpc64-linux-ld:
	failed to merge target specific data of
	file drivers/gpu/drm/amd/amdgpu/../display/dc/dcn315/dcn315_resource.o
powerpc64-linux-ld:
	drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o
		uses hard float,
	drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o
		uses soft float
powerpc64-linux-ld:
	failed to merge target specific data of file
	drivers/gpu/drm/amd/amdgpu/../display/dc/dcn316/dcn316_resource.o

The problem was introduced with commit 41b7a347bf14 ("powerpc: Book3S
64-bit outline-only KASAN support") which adds support for KASAN. This
commit in turn enables DRM_AMD_DC_DCN because KCOV_INSTRUMENT_ALL and
KCOV_ENABLE_COMPARISONS are no longer enabled. As result, new files are
compiled which lack the selection of hard-float.

Fixes: 41b7a347bf14 ("powerpc: Book3S 64-bit outline-only KASAN support")
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Daniel Axtens <dja@...ens.net>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/gpu/drm/amd/display/dc/dcn31/Makefile  | 4 ++++
 drivers/gpu/drm/amd/display/dc/dcn315/Makefile | 4 ++++
 drivers/gpu/drm/amd/display/dc/dcn316/Makefile | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/Makefile b/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
index ec041e3cda30..74be02114ae4 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
@@ -15,6 +15,10 @@ DCN31 = dcn31_resource.o dcn31_hubbub.o dcn31_hwseq.o dcn31_init.o dcn31_hubp.o
 	dcn31_apg.o dcn31_hpo_dp_stream_encoder.o dcn31_hpo_dp_link_encoder.o \
 	dcn31_afmt.o dcn31_vpg.o
 
+ifdef CONFIG_PPC64
+CFLAGS_$(AMDDALPATH)/dc/dcn31/dcn31_resource.o := -mhard-float -maltivec
+endif
+
 AMD_DAL_DCN31 = $(addprefix $(AMDDALPATH)/dc/dcn31/,$(DCN31))
 
 AMD_DISPLAY_FILES += $(AMD_DAL_DCN31)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn315/Makefile b/drivers/gpu/drm/amd/display/dc/dcn315/Makefile
index 59381d24800b..1395c1ced8c5 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn315/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn315/Makefile
@@ -25,6 +25,10 @@
 
 DCN315 = dcn315_resource.o
 
+ifdef CONFIG_PPC64
+CFLAGS_$(AMDDALPATH)/dc/dcn315/dcn315_resource.o := -mhard-float -maltivec
+endif
+
 AMD_DAL_DCN315 = $(addprefix $(AMDDALPATH)/dc/dcn315/,$(DCN315))
 
 AMD_DISPLAY_FILES += $(AMD_DAL_DCN315)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn316/Makefile b/drivers/gpu/drm/amd/display/dc/dcn316/Makefile
index 819d44a9439b..c3d2dd78f1e2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn316/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn316/Makefile
@@ -25,6 +25,10 @@
 
 DCN316 = dcn316_resource.o
 
+ifdef CONFIG_PPC64
+CFLAGS_$(AMDDALPATH)/dc/dcn316/dcn316_resource.o := -mhard-float -maltivec
+endif
+
 AMD_DAL_DCN316 = $(addprefix $(AMDDALPATH)/dc/dcn316/,$(DCN316))
 
 AMD_DISPLAY_FILES += $(AMD_DAL_DCN316)
-- 
2.35.1