virtio-gpu: add atomic_commit function

Do modesets first, then call drm_atomic_helper_commit_planes with
active_only = true.  That way the outputs doesn't get disabled
temporarly on atomic commits.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index d4305da..c5d33e0 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -466,10 +466,30 @@ virtio_gpu_user_framebuffer_create(struct drm_device *dev,
        return &virtio_gpu_fb->base;
 }
 
+static int vgdev_atomic_commit(struct drm_device *dev,
+                              struct drm_atomic_state *state,
+                              bool nonblock)
+{
+       if (nonblock)
+               return -EBUSY;
+
+       drm_atomic_helper_swap_state(dev, state);
+       drm_atomic_helper_wait_for_fences(dev, state);
+
+       drm_atomic_helper_commit_modeset_disables(dev, state);
+       drm_atomic_helper_commit_modeset_enables(dev, state);
+       drm_atomic_helper_commit_planes(dev, state, true);
+
+       drm_atomic_helper_wait_for_vblanks(dev, state);
+       drm_atomic_helper_cleanup_planes(dev, state);
+       drm_atomic_state_free(state);
+       return 0;
+}
+
 static const struct drm_mode_config_funcs virtio_gpu_mode_funcs = {
        .fb_create = virtio_gpu_user_framebuffer_create,
        .atomic_check = drm_atomic_helper_check,
-       .atomic_commit = drm_atomic_helper_commit,
+       .atomic_commit = vgdev_atomic_commit,
 };
 
 int virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 0a54f43..ecd1c43 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -33,6 +33,7 @@
 
 #include <drm/drmP.h>
 #include <drm/drm_gem.h>
+#include <drm/drm_atomic.h>
 #include <drm/drm_crtc_helper.h>
 #include <ttm/ttm_bo_api.h>
 #include <ttm/ttm_bo_driver.h>