When going through a disable/enable cycle without changing the framebuffer
the optimization added by commit 3954ff10e06e causes the screen stay
blank. Add a bool to force an update to fix that.
Cc: 1882851@xxxxxxxxxxxxxxxxxx
Fixes: 3954ff10e06e ("drm/virtio: skip set_scanout if framebuffer didn't change")
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
drivers/gpu/drm/virtio/virtgpu_display.c | 1 +
drivers/gpu/drm/virtio/virtgpu_plane.c | 4 +++-
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 7879ff58236f..6d5410d5dd84 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -138,6 +138,7 @@ struct virtio_gpu_output {
int cur_x;
int cur_y;
bool enabled;
+ bool need_update;
};
#define drm_crtc_to_virtio_gpu_output(x) \
container_of(x, struct virtio_gpu_output, crtc)
diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index 2b7e6ae65546..44e9c7b874f5 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -99,6 +99,7 @@ static void virtio_gpu_crtc_atomic_enable(struct drm_crtc *crtc,
struct virtio_gpu_output *output = drm_crtc_to_virtio_gpu_output(crtc);
output->enabled = true;
+ output->need_update = true;
}
static void virtio_gpu_crtc_atomic_disable(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
index 52d24179bcec..5948031a9ce8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -163,7 +163,8 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
plane->state->src_w != old_state->src_w ||
plane->state->src_h != old_state->src_h ||
plane->state->src_x != old_state->src_x ||
- plane->state->src_y != old_state->src_y) {
+ plane->state->src_y != old_state->src_y ||
+ output->need_update) {
DRM_DEBUG("handle 0x%x, crtc %dx%d+%d+%d, src %dx%d+%d+%d\n",
bo->hw_res_handle,
plane->state->crtc_w, plane->state->crtc_h,
@@ -178,6 +179,7 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
plane->state->src_h >> 16,
plane->state->src_x >> 16,
plane->state->src_y >> 16);
+ output->need_update = false;
}
virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle,
--
2.18.4
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