diff options
| author |   Huacai Chen <chenhuacai@loongson.cn> | 2022-05-31 18:04:10 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-06-03 20:09:27 +0800 |
| commit | 439057ec3b748b1ff61855d09859f369493e22d8 (patch) | |
| tree | 488f331128a8ba653855b4434dcf1825b12804bb /drivers/gpu/drm/drm_vm.c | |
| parent | LoongArch: Add ELF-related definitions (diff) | |
| download | linux-dev-439057ec3b748b1ff61855d09859f369493e22d8.tar.xz linux-dev-439057ec3b748b1ff61855d09859f369493e22d8.zip | |
LoongArch: Add writecombine support for drm
LoongArch maintains cache coherency in hardware, but its WUC attribute
(Weak-ordered UnCached, which is similar to WC) is out of the scope of
cache coherency machanism. This means WUC can only used for write-only
memory regions.
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'drivers/gpu/drm/drm_vm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c index e957d4851dc0..f024dc93939e 100644 --- a/drivers/gpu/drm/drm_vm.c +++ b/drivers/gpu/drm/drm_vm.c @@ -69,7 +69,7 @@ static pgprot_t drm_io_prot(struct drm_local_map *map, pgprot_t tmp = vm_get_page_prot(vma->vm_flags); #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \ - defined(__mips__) + defined(__mips__) || defined(__loongarch__) if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) tmp = pgprot_noncached(tmp); else |