From e3b47c1b84964c62b3e1fa782f1ffa4be0ae62f9 Mon Sep 17 00:00:00 2001
From: Peter Seiderer <ps.report@gmx.net>
Date: Mon, 9 Mar 2020 13:01:14 +0100
Subject: [PATCH] vc4: add meson option to disable optional neon support

Not all toolchains are able to compile the runtime
optional vc4 neon support, so add an meson option
to force disabling it at compile time.

[Upstream: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4114]
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[rebased for 20.2.0]
---
 meson_options.txt                    | 7 +++++++
 src/gallium/drivers/vc4/meson.build  | 4 ++--
 src/gallium/drivers/vc4/vc4_tiling.h | 4 ++--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/meson_options.txt b/meson_options.txt
index a39596a6f19..0f6b6c62b55 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -124,6 +124,13 @@ option(
   choices : ['auto', 'true', 'false', 'enabled', 'disabled'],
   description : 'enable gallium va frontend.',
 )
+option(
+  'gallium-vc4-neon',
+  type : 'combo',
+  value : 'auto',
+  choices : ['auto', 'disabled'],
+  description : 'enable gallium vc4 optional neon support.',
+)
 option(
   'va-libs-path',
   type : 'string',
diff --git a/src/gallium/drivers/vc4/meson.build b/src/gallium/drivers/vc4/meson.build
index 5ce5af5f6b4..e3f7d8d62ae 100644
--- a/src/gallium/drivers/vc4/meson.build
+++ b/src/gallium/drivers/vc4/meson.build
@@ -84,7 +84,7 @@ files_libvc4 = files(
 vc4_c_args = []
 
 libvc4_neon = []
-if host_machine.cpu_family() == 'arm'
+if host_machine.cpu_family() == 'arm' and get_option('gallium-vc4-neon') != 'disabled'
   libvc4_neon = static_library(
     'vc4_neon',
     'vc4_tiling_lt_neon.c',
@@ -93,7 +93,7 @@ if host_machine.cpu_family() == 'arm'
     ],
     c_args : '-mfpu=neon',
   )
-  vc4_c_args += '-DUSE_ARM_ASM'
+  vc4_c_args += '-DVC4_TILING_LT_NEON'
 endif
 
 if dep_simpenrose.found()
diff --git a/src/gallium/drivers/vc4/vc4_tiling.h b/src/gallium/drivers/vc4/vc4_tiling.h
index 66767e7f1f8..7446f1c3d0c 100644
--- a/src/gallium/drivers/vc4/vc4_tiling.h
+++ b/src/gallium/drivers/vc4/vc4_tiling.h
@@ -89,7 +89,7 @@ vc4_load_lt_image(void *dst, uint32_t dst_stride,
                   void *src, uint32_t src_stride,
                   int cpp, const struct pipe_box *box)
 {
-#ifdef USE_ARM_ASM
+#ifdef VC4_TILING_LT_NEON
         if (util_cpu_caps.has_neon) {
                 vc4_load_lt_image_neon(dst, dst_stride, src, src_stride,
                                        cpp, box);
@@ -105,7 +105,7 @@ vc4_store_lt_image(void *dst, uint32_t dst_stride,
                    void *src, uint32_t src_stride,
                    int cpp, const struct pipe_box *box)
 {
-#ifdef USE_ARM_ASM
+#ifdef VC4_TILING_LT_NEON
         if (util_cpu_caps.has_neon) {
                 vc4_store_lt_image_neon(dst, dst_stride, src, src_stride,
                                         cpp, box);
-- 
2.25.1