[PATCH] drm/virtio: add overlay plane format support
COOLING8d
From: Baorui.Liu <hidden>
Date: 2026-09-24 14:23:06
Also in:
dri-devel, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest, virtio gpu driver · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds, David Airlie, Gerd Hoffmann, Dmitry Osipenko
From: Sophia Gong <redacted> Advertise additional pixel formats for virtio-gpu overlay planes so a userspace compositor can use KMS overlay composition instead of falling back to GPU composition. Handle DRM_PLANE_TYPE_OVERLAY in virtio_gpu_plane_init() with a dedicated format list, and reuse the primary plane update path for overlay scanout. Signed-off-by: Sophia Gong <redacted> Signed-off-by: Baorui.Liu <redacted> --- drivers/gpu/drm/virtio/virtgpu_plane.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 29e4b458ae57..23ca880692f1 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c@@ -41,6 +41,21 @@ static const uint32_t virtio_gpu_cursor_formats[] = { DRM_FORMAT_HOST_ARGB8888, }; +static const uint32_t virtio_gpu_overlay_formats[] = { + DRM_FORMAT_XRGB8888, + DRM_FORMAT_ARGB8888, + DRM_FORMAT_BGRX8888, + DRM_FORMAT_BGRA8888, + DRM_FORMAT_RGBX8888, + DRM_FORMAT_RGBA8888, + DRM_FORMAT_XBGR8888, + DRM_FORMAT_ABGR8888, + DRM_FORMAT_XRGB2101010, + DRM_FORMAT_BGRX1010102, + DRM_FORMAT_NV12, + DRM_FORMAT_P010, +}; + uint32_t virtio_gpu_translate_format(uint32_t drm_fourcc) { uint32_t format;
@@ -572,6 +587,13 @@ static const struct drm_plane_helper_funcs virtio_gpu_cursor_helper_funcs = { .atomic_update = virtio_gpu_cursor_plane_update, }; +static const struct drm_plane_helper_funcs virtio_gpu_overlay_helper_funcs = { + .prepare_fb = virtio_gpu_plane_prepare_fb, + .cleanup_fb = virtio_gpu_plane_cleanup_fb, + .atomic_check = virtio_gpu_plane_atomic_check, + .atomic_update = virtio_gpu_primary_plane_update, +}; + struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev, enum drm_plane_type type, int index)
@@ -586,6 +608,10 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev, formats = virtio_gpu_cursor_formats; nformats = ARRAY_SIZE(virtio_gpu_cursor_formats); funcs = &virtio_gpu_cursor_helper_funcs; + } else if (type == DRM_PLANE_TYPE_OVERLAY) { + formats = virtio_gpu_overlay_formats; + nformats = ARRAY_SIZE(virtio_gpu_overlay_formats); + funcs = &virtio_gpu_overlay_helper_funcs; } else { formats = virtio_gpu_formats; nformats = ARRAY_SIZE(virtio_gpu_formats);
--
2.25.1