drm/nv50-nvc0: request and wait on notification of modeset completion

This should prevent a number of races from occuring, the most obvious of
which will be exposed when we start making use of the "display sync" evo
channel for page flipping.  The DS channel will reject any command stream
that doesn't completely agree with the current "master" state.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 53 insertions, 24 deletions

diff --git a/drivers/gpu/drm/nouveau/nv50_crtc.c b/drivers/gpu/drm/nouveau/nv50_crtc.c
index bc5fa36677c1..a94aff57cc06 100644
--- a/drivers/gpu/drm/nouveau/nv50_crtc.c
+++ b/drivers/gpu/drm/nouveau/nv50_crtc.c
@@ -443,6 +443,42 @@ nv50_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 }
 
+static int
+nv50_crtc_wait_complete(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
+	struct nv50_display *disp = nv50_display(dev);
+	struct nouveau_channel *evo = disp->master;
+	u64 start;
+	int ret;
+
+	ret = RING_SPACE(evo, 6);
+	if (ret)
+		return ret;
+	BEGIN_RING(evo, 0, 0x0084, 1);
+	OUT_RING  (evo, 0x80000000);
+	BEGIN_RING(evo, 0, 0x0080, 1);
+	OUT_RING  (evo, 0);
+	BEGIN_RING(evo, 0, 0x0084, 1);
+	OUT_RING  (evo, 0x00000000);
+
+	nv_wo32(disp->ntfy, 0x000, 0x00000000);
+	FIRE_RING (evo);
+
+	start = ptimer->read(dev);
+	do {
+		nv_wr32(dev, 0x61002c, 0x370);
+		nv_wr32(dev, 0x000140, 1);
+
+		if (nv_ro32(disp->ntfy, 0x000))
+			return 0;
+	} while (ptimer->read(dev) - start < 2000000000ULL);
+
+	return -EBUSY;
+}
+
 static void
 nv50_crtc_prepare(struct drm_crtc *crtc)
 {
@@ -459,23 +495,13 @@ static void
 nv50_crtc_commit(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
-	struct nouveau_channel *evo = nv50_display(dev)->master;
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
-	int ret;
 
 	NV_DEBUG_KMS(dev, "index %d\n", nv_crtc->index);
 
 	nv50_crtc_blank(nv_crtc, false);
 	drm_vblank_post_modeset(dev, nv_crtc->index);
-
-	ret = RING_SPACE(evo, 2);
-	if (ret) {
-		NV_ERROR(dev, "no space while committing crtc\n");
-		return;
-	}
-	BEGIN_RING(evo, 0, NV50_EVO_UPDATE, 1);
-	OUT_RING  (evo, 0);
-	FIRE_RING (evo);
+	nv50_crtc_wait_complete(crtc);
 }
 
 static bool
@@ -488,7 +514,7 @@ nv50_crtc_mode_fixup(struct drm_crtc *crtc, struct drm_display_mode *mode,
 static int
 nv50_crtc_do_mode_set_base(struct drm_crtc *crtc,
 			   struct drm_framebuffer *passed_fb,
-			   int x, int y, bool update, bool atomic)
+			   int x, int y, bool atomic)
 {
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
 	struct drm_device *dev = nv_crtc->base.dev;
@@ -598,15 +624,6 @@ nv50_crtc_do_mode_set_base(struct drm_crtc *crtc,
 		nv50_crtc_lut_load(crtc);
 	}
 
-	if (update) {
-		ret = RING_SPACE(evo, 2);
-		if (ret)
-			return ret;
-		BEGIN_RING(evo, 0, NV50_EVO_UPDATE, 1);
-		OUT_RING(evo, 0);
-		FIRE_RING(evo);
-	}
-
 	return 0;
 }
 
@@ -696,14 +713,20 @@ nv50_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
 	nv_crtc->set_dither(nv_crtc, nv_connector->use_dithering, false);
 	nv_crtc->set_scale(nv_crtc, nv_connector->scaling_mode, false);
 
-	return nv50_crtc_do_mode_set_base(crtc, old_fb, x, y, false, false);
+	return nv50_crtc_do_mode_set_base(crtc, old_fb, x, y, false);
 }
 
 static int
 nv50_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 			struct drm_framebuffer *old_fb)
 {
-	return nv50_crtc_do_mode_set_base(crtc, old_fb, x, y, true, false);
+	int ret;
+
+	ret = nv50_crtc_do_mode_set_base(crtc, old_fb, x, y, false);
+	if (ret)
+		return ret;
+
+	return nv50_crtc_wait_complete(crtc);
 }
 
 static int
@@ -711,7 +734,13 @@ nv50_crtc_mode_set_base_atomic(struct drm_crtc *crtc,
 			       struct drm_framebuffer *fb,
 			       int x, int y, enum mode_set_atomic state)
 {
-	return nv50_crtc_do_mode_set_base(crtc, fb, x, y, true, true);
+	int ret;
+
+	ret = nv50_crtc_do_mode_set_base(crtc, fb, x, y, true);
+	if (ret)
+		return ret;
+
+	return nv50_crtc_wait_complete(crtc);
 }
 
 static const struct drm_crtc_helper_funcs nv50_crtc_helper_funcs = {