Commit 4b5a51e4 authored by Thomas Zimmermann's avatar Thomas Zimmermann
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drm/simpledrm: Synchronize access to GEM BOs 



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

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922130944.27138-6-tzimmermann@suse.de
parent 52a504e8

drivers/gpu/drm/tiny/simpledrm.c

+8 −2
Original line number Diff line number Diff line
@@ -480,11 +480,15 @@ 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;



	if (!drm_dev_enter(dev, &idx))

	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);

	if (ret)

		return;



	if (!drm_dev_enter(dev, &idx))

		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) {

		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(sdev->screen_base);
@@ -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,