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drm/simpledrm: Synchronize access to GEM BOs

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Synchronize CPU access to GEM BOs with other drivers when updating the
screen buffer. Imported buffers might otherwise contain stale data.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922130944.27138-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2022-09-22 15:09:44 +02:00
parent 52a504e868
commit 4b5a51e45f
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/tiny/simpledrm.c
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@@ -480,10 +480,14 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane
struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
int idx;
int ret, idx;
ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
if (ret)
return;
if (!drm_dev_enter(dev, &idx))
return;
goto out_drm_gem_fb_end_cpu_access;
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
@@ -499,6 +503,8 @@ static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane
}
drm_dev_exit(idx);
out_drm_gem_fb_end_cpu_access:
drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
}
static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,