Add DRM_FORMAT_HOST_ARGB8888 to the list of supported formats for
virtio-gpu primary planes. Without this, glmark2-drm fails at
startup because it selects ARGB visual configs by default, which
don't match the XRGB-only plane capabilities. This causes
drmModeSetCrtc to fail with EINVAL.

The virtio_gpu_translate_format() function already handles
ARGB8888 translation to VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM,
so this just exposes the existing capability to userspace.

Signed-off-by: Dorinda Bassey <[email protected]>
---
 drivers/gpu/drm/virtio/virtgpu_plane.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c 
b/drivers/gpu/drm/virtio/virtgpu_plane.c
index b422eba42a5f..5f0bc1b1931b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -37,6 +37,7 @@
 
 static const uint32_t virtio_gpu_formats[] = {
        DRM_FORMAT_HOST_XRGB8888,
+       DRM_FORMAT_HOST_ARGB8888,
 };
 
 static const uint32_t virtio_gpu_cursor_formats[] = {
-- 
2.55.0

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