[Intel-gfx] [PATCH 15/25] drm/tilcdc: Use standard drm_atomic_helper_commit

[Daniel Vetter]

Gives us proper nonblocking support for free, and a pile of other
things. The tilcdc code is simply old enough that it was never
converted over, but was stuck forever with the copypasta from when it
was initially merged.

The riskiest thing with this conversion is maybe that there's an issue
with the vblank handling or vblank event handling, which will upset
the modern commit support in atomic helpers. But from a cursory review
drm_crtc_vblank_on/off is called in the right places, and the event
handling also seems to exist (albeit with much hand-rolling and
probably some races, could perhaps be converted over to
drm_crtc_arm_vblank_event without any real loss).

Motivated by me not having to hand-roll the dma-fence annotations for
this.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
Cc: Jyri Sarha <jsarha at ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_drv.c | 47 +----------------------------
 1 file changed, 1 insertion(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 0d74a6443263..4f5fc3e87383 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -87,55 +87,10 @@ static int tilcdc_atomic_check(struct drm_device *dev,
 	return ret;
 }
 
-static int tilcdc_commit(struct drm_device *dev,
-		  struct drm_atomic_state *state,
-		  bool async)
-{
-	int ret;
-
-	ret = drm_atomic_helper_prepare_planes(dev, state);
-	if (ret)
-		return ret;
-
-	ret = drm_atomic_helper_swap_state(state, true);
-	if (ret) {
-		drm_atomic_helper_cleanup_planes(dev, state);
-		return ret;
-	}
-
-	/*
-	 * Everything below can be run asynchronously without the need to grab
-	 * any modeset locks at all under one condition: It must be guaranteed
-	 * that the asynchronous work has either been cancelled (if the driver
-	 * supports it, which at least requires that the framebuffers get
-	 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
-	 * before the new state gets committed on the software side with
-	 * drm_atomic_helper_swap_state().
-	 *
-	 * This scheme allows new atomic state updates to be prepared and
-	 * checked in parallel to the asynchronous completion of the previous
-	 * update. Which is important since compositors need to figure out the
-	 * composition of the next frame right after having submitted the
-	 * current layout.
-	 */
-
-	drm_atomic_helper_commit_modeset_disables(dev, state);
-
-	drm_atomic_helper_commit_planes(dev, state, 0);
-
-	drm_atomic_helper_commit_modeset_enables(dev, state);
-
-	drm_atomic_helper_wait_for_vblanks(dev, state);
-
-	drm_atomic_helper_cleanup_planes(dev, state);
-
-	return 0;
-}
-
 static const struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = drm_gem_fb_create,
 	.atomic_check = tilcdc_atomic_check,
-	.atomic_commit = tilcdc_commit,
+	.atomic_commit = drm_atomic_helper_commit,
 };
 
 static void modeset_init(struct drm_device *dev)
-- 
2.27.0