drm/nouveau/kms/nv50: transition to atomic interfaces internally

This commit implements the atomic commit interfaces, and implements the
legacy modeset and page flipping interfaces on top of them.

There's two major changes in behavior from before:

- We're now making use of interlocks between core and satellite EVO
  channels, which greatly improves our ability to keep their states
  synchronised.
- DPMS is now implemented as a full modeset to either tear down the
  entire pipe (or bring it back up).  This choice was made mostly
  to ease the initial implementation, but I'm also not sure what we
  gain by bring backing the old behaviour.  We shall see.

This does NOT currently expose the atomic ioctl by default, due to
limited testing having been performed.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -280,7 +280,7 @@ nouveau_framebuffer_new(struct drm_device *dev,
 	return ret;
 }
 
-static struct drm_framebuffer *
+struct drm_framebuffer *
 nouveau_user_framebuffer_create(struct drm_device *dev,
 				struct drm_file *file_priv,
 				const struct drm_mode_fb_cmd2 *mode_cmd)

drivers/gpu/drm/nouveau/nouveau_display.h

@@ -106,4 +106,7 @@ nouveau_backlight_exit(struct drm_device *dev) {
 }
 #endif
 
+struct drm_framebuffer *
+nouveau_user_framebuffer_create(struct drm_device *, struct drm_file *,
+				const struct drm_mode_fb_cmd2 *);
 #endif

drivers/gpu/drm/nouveau/nv50_display.c

@@ -49,6 +49,7 @@
 #include "nouveau_encoder.h"
 #include "nouveau_crtc.h"
 #include "nouveau_fence.h"
+#include "nouveau_fbcon.h"
 #include "nv50_display.h"
 
 #define EVO_DMA_NR 9
@@ -70,6 +71,37 @@
 /******************************************************************************
  * Atomic state
  *****************************************************************************/
+#define nv50_atom(p) container_of((p), struct nv50_atom, state)
+
+struct nv50_atom {
+	struct drm_atomic_state state;
+
+	struct list_head outp;
+	bool lock_core;
+	bool flush_disable;
+};
+
+struct nv50_outp_atom {
+	struct list_head head;
+
+	struct drm_encoder *encoder;
+	bool flush_disable;
+
+	union {
+		struct {
+			bool ctrl:1;
+		};
+		u8 mask;
+	} clr;
+
+	union {
+		struct {
+			bool ctrl:1;
+		};
+		u8 mask;
+	} set;
+};
+
 #define nv50_head_atom(p) container_of((p), struct nv50_head_atom, state)
 
 struct nv50_head_atom {
@@ -179,6 +211,15 @@ struct nv50_head_atom {
 	} set;
 };
 
+static inline struct nv50_head_atom *
+nv50_head_atom_get(struct drm_atomic_state *state, struct drm_crtc *crtc)
+{
+	struct drm_crtc_state *statec = drm_atomic_get_crtc_state(state, crtc);
+	if (IS_ERR(statec))
+		return (void *)statec;
+	return nv50_head_atom(statec);
+}
+
 #define nv50_wndw_atom(p) container_of((p), struct nv50_wndw_atom, state)
 
 struct nv50_wndw_atom {
@@ -639,6 +680,8 @@ struct nv50_disp {
 	struct nv50_mast mast;
 
 	struct nouveau_bo *sync;
+
+	struct mutex mutex;
 };
 
 static struct nv50_disp *
@@ -757,7 +800,6 @@ struct nv50_wndw {
 	u16 sema;
 	u32 data;
 
-	struct nv50_wndw_atom arm;
 	struct nv50_wndw_atom asy;
 };
 
@@ -885,18 +927,15 @@ nv50_wndw_atomic_check(struct drm_plane *plane, struct drm_plane_state *state)
 {
 	struct nouveau_drm *drm = nouveau_drm(plane->dev);
 	struct nv50_wndw *wndw = nv50_wndw(plane);
-	struct nv50_wndw_atom *armw = &wndw->arm;
-	struct nv50_wndw_atom *asyw = &wndw->asy;
+	struct nv50_wndw_atom *armw = nv50_wndw_atom(wndw->plane.state);
+	struct nv50_wndw_atom *asyw = nv50_wndw_atom(state);
 	struct nv50_head_atom *harm = NULL, *asyh = NULL;
 	bool varm = false, asyv = false, asym = false;
 	int ret;
 
-	asyw->clr.mask = 0;
-	asyw->set.mask = 0;
-
 	NV_ATOMIC(drm, "%s atomic_check\n", plane->name);
 	if (asyw->state.crtc) {
-		asyh = &nv50_head(asyw->state.crtc)->asy;
+		asyh = nv50_head_atom_get(asyw->state.state, asyw->state.crtc);
 		if (IS_ERR(asyh))
 			return PTR_ERR(asyh);
 		asym = drm_atomic_crtc_needs_modeset(&asyh->state);
@@ -904,10 +943,10 @@ nv50_wndw_atomic_check(struct drm_plane *plane, struct drm_plane_state *state)
 	}
 
 	if (armw->state.crtc) {
-		harm = &nv50_head(armw->state.crtc)->asy;
+		harm = nv50_head_atom_get(asyw->state.state, armw->state.crtc);
 		if (IS_ERR(harm))
 			return PTR_ERR(harm);
-		varm = nv50_head(harm->state.crtc)->arm.state.active;
+		varm = harm->state.crtc->state->active;
 	}
 
 	if (asyv) {
@@ -936,10 +975,73 @@ nv50_wndw_atomic_check(struct drm_plane *plane, struct drm_plane_state *state)
 		asyw->set.lut = wndw->func->lut && asyv;
 	}
 
-	memcpy(armw, asyw, sizeof(*asyw));
 	return 0;
 }
 
+static void
+nv50_wndw_cleanup_fb(struct drm_plane *plane, struct drm_plane_state *old_state)
+{
+	struct nouveau_framebuffer *fb = nouveau_framebuffer(old_state->fb);
+	struct nouveau_drm *drm = nouveau_drm(plane->dev);
+
+	NV_ATOMIC(drm, "%s cleanup: %p\n", plane->name, old_state->fb);
+	if (!old_state->fb)
+		return;
+
+	nouveau_bo_unpin(fb->nvbo);
+}
+
+static int
+nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
+{
+	struct nouveau_framebuffer *fb = nouveau_framebuffer(state->fb);
+	struct nouveau_drm *drm = nouveau_drm(plane->dev);
+	struct nv50_wndw *wndw = nv50_wndw(plane);
+	struct nv50_wndw_atom *asyw = nv50_wndw_atom(state);
+	struct nv50_head_atom *asyh;
+	struct nv50_dmac_ctxdma *ctxdma;
+	u32 name;
+	u8 kind;
+	int ret;
+
+	NV_ATOMIC(drm, "%s prepare: %p\n", plane->name, state->fb);
+	if (!asyw->state.fb)
+		return 0;
+	kind = (fb->nvbo->tile_flags & 0x0000ff00) >> 8;
+	name = 0xfb000000 | kind;
+
+	ret = nouveau_bo_pin(fb->nvbo, TTM_PL_FLAG_VRAM, true);
+	if (ret)
+		return ret;
+
+	ctxdma = nv50_dmac_ctxdma_new(wndw->dmac, name, fb);
+	if (IS_ERR(ctxdma)) {
+		nouveau_bo_unpin(fb->nvbo);
+		return PTR_ERR(ctxdma);
+	}
+
+	asyw->state.fence = reservation_object_get_excl_rcu(fb->nvbo->bo.resv);
+	asyw->image.handle = ctxdma->object.handle;
+	asyw->image.offset = fb->nvbo->bo.offset;
+
+	if (wndw->func->prepare) {
+		asyh = nv50_head_atom_get(asyw->state.state, asyw->state.crtc);
+		if (IS_ERR(asyh))
+			return PTR_ERR(asyh);
+
+		wndw->func->prepare(wndw, asyh, asyw);
+	}
+
+	return 0;
+}
+
+static const struct drm_plane_helper_funcs
+nv50_wndw_helper = {
+	.prepare_fb = nv50_wndw_prepare_fb,
+	.cleanup_fb = nv50_wndw_cleanup_fb,
+	.atomic_check = nv50_wndw_atomic_check,
+};
+
 static void
 nv50_wndw_atomic_destroy_state(struct drm_plane *plane,
 			       struct drm_plane_state *state)
@@ -998,6 +1100,8 @@ nv50_wndw_destroy(struct drm_plane *plane)
 
 static const struct drm_plane_funcs
 nv50_wndw = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
 	.destroy = nv50_wndw_destroy,
 	.reset = nv50_wndw_reset,
 	.set_property = drm_atomic_helper_plane_set_property,
@@ -1033,6 +1137,7 @@ nv50_wndw_ctor(const struct nv50_wndw_func *func, struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	drm_plane_helper_add(&wndw->plane, &nv50_wndw_helper);
 	return 0;
 }
 
@@ -2165,17 +2270,46 @@ nv50_head_atomic_check(struct drm_crtc *crtc, struct drm_crtc_state *state)
 	struct nouveau_drm *drm = nouveau_drm(crtc->dev);
 	struct nv50_disp *disp = nv50_disp(crtc->dev);
 	struct nv50_head *head = nv50_head(crtc);
-	struct nv50_head_atom *armh = &head->arm;
+	struct nv50_head_atom *armh = nv50_head_atom(crtc->state);
 	struct nv50_head_atom *asyh = nv50_head_atom(state);
+	struct nouveau_conn_atom *asyc = NULL;
+	struct drm_connector_state *conns;
+	struct drm_connector *conn;
+	int i;
 
 	NV_ATOMIC(drm, "%s atomic_check %d\n", crtc->name, asyh->state.active);
-	asyh->clr.mask = 0;
-	asyh->set.mask = 0;
-
 	if (asyh->state.active) {
+		for_each_connector_in_state(asyh->state.state, conn, conns, i) {
+			if (conns->crtc == crtc) {
+				asyc = nouveau_conn_atom(conns);
+				break;
+			}
+		}
+
+		if (armh->state.active) {
+			if (asyc) {
+				if (asyh->state.mode_changed)
+					asyc->set.scaler = true;
+				if (armh->base.depth != asyh->base.depth)
+					asyc->set.dither = true;
+			}
+		} else {
+			asyc->set.mask = ~0;
+			asyh->set.mask = ~0;
+		}
+
 		if (asyh->state.mode_changed)
 			nv50_head_atomic_check_mode(head, asyh);
 
+		if (asyc) {
+			if (asyc->set.scaler)
+				nv50_head_atomic_check_view(armh, asyh, asyc);
+			if (asyc->set.dither)
+				nv50_head_atomic_check_dither(armh, asyh, asyc);
+			if (asyc->set.procamp)
+				nv50_head_atomic_check_procamp(armh, asyh, asyc);
+		}
+
 		if ((asyh->core.visible = (asyh->base.cpp != 0))) {
 			asyh->core.x = asyh->base.x;
 			asyh->core.y = asyh->base.y;
@@ -2234,20 +2368,21 @@ nv50_head_atomic_check(struct drm_crtc *crtc, struct drm_crtc_state *state)
 		asyh->set.curs = asyh->curs.visible;
 	}
 
-	memcpy(armh, asyh, sizeof(*asyh));
-	asyh->state.mode_changed = 0;
+	if (asyh->clr.mask || asyh->set.mask)
+		nv50_atom(asyh->state.state)->lock_core = true;
 	return 0;
 }
 
 /******************************************************************************
  * CRTC
  *****************************************************************************/
+
 static int
 nv50_crtc_set_dither(struct nouveau_crtc *nv_crtc, bool update)
 {
 	struct nv50_mast *mast = nv50_mast(nv_crtc->base.dev);
 	struct nv50_head *head = nv50_head(&nv_crtc->base);
-	struct nv50_head_atom *asyh = &head->asy;
+	struct nv50_head_atom *asyh = nv50_head_atom(nv_crtc->base.state);
 	struct nouveau_connector *nv_connector;
 	struct nouveau_conn_atom asyc;
 	u32 *push;
@@ -2277,7 +2412,7 @@ static int
 nv50_crtc_set_scale(struct nouveau_crtc *nv_crtc, bool update)
 {
 	struct nv50_head *head = nv50_head(&nv_crtc->base);
-	struct nv50_head_atom *asyh = &head->asy;
+	struct nv50_head_atom *asyh = nv50_head_atom(nv_crtc->base.state);
 	struct drm_crtc *crtc = &nv_crtc->base;
 	struct nouveau_connector *nv_connector;
 	struct nouveau_conn_atom asyc;
@@ -2307,7 +2442,7 @@ nv50_crtc_set_color_vibrance(struct nouveau_crtc *nv_crtc, bool update)
 {
 	struct nv50_mast *mast = nv50_mast(nv_crtc->base.dev);
 	struct nv50_head *head = nv50_head(&nv_crtc->base);
-	struct nv50_head_atom *asyh = &head->asy;
+	struct nv50_head_atom *asyh = nv50_head_atom(nv_crtc->base.state);
 	struct nouveau_conn_atom asyc;
 	u32 *push;
 
@@ -2685,15 +2820,143 @@ static const struct drm_crtc_helper_funcs nv50_crtc_hfunc = {
 	.mode_set_base_atomic = nv50_crtc_mode_set_base_atomic,
 	.load_lut = nv50_crtc_lut_load,
 	.disable = nv50_crtc_disable,
+	.atomic_check = nv50_head_atomic_check,
 };
 
+/* This is identical to the version in the atomic helpers, except that
+ * it supports non-vblanked ("async") page flips.
+ */
+static int
+nv50_head_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
+		    struct drm_pending_vblank_event *event, u32 flags)
+{
+	struct drm_plane *plane = crtc->primary;
+	struct drm_atomic_state *state;
+	struct drm_plane_state *plane_state;
+	struct drm_crtc_state *crtc_state;
+	int ret = 0;
+
+	state = drm_atomic_state_alloc(plane->dev);
+	if (!state)
+		return -ENOMEM;
+
+	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+retry:
+	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	if (IS_ERR(crtc_state)) {
+		ret = PTR_ERR(crtc_state);
+		goto fail;
+	}
+	crtc_state->event = event;
+
+	plane_state = drm_atomic_get_plane_state(state, plane);
+	if (IS_ERR(plane_state)) {
+		ret = PTR_ERR(plane_state);
+		goto fail;
+	}
+
+	ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
+	if (ret != 0)
+		goto fail;
+	drm_atomic_set_fb_for_plane(plane_state, fb);
+
+	/* Make sure we don't accidentally do a full modeset. */
+	state->allow_modeset = false;
+	if (!crtc_state->active) {
+		DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n",
+				 crtc->base.id);
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
+		nv50_wndw_atom(plane_state)->interval = 0;
+
+	ret = drm_atomic_nonblocking_commit(state);
+fail:
+	if (ret == -EDEADLK)
+		goto backoff;
+
+	drm_atomic_state_put(state);
+	return ret;
+
+backoff:
+	drm_atomic_state_clear(state);
+	drm_atomic_legacy_backoff(state);
+
+	/*
+	 * Someone might have exchanged the framebuffer while we dropped locks
+	 * in the backoff code. We need to fix up the fb refcount tracking the
+	 * core does for us.
+	 */
+	plane->old_fb = plane->fb;
+
+	goto retry;
+}
+
+static void
+nv50_head_atomic_destroy_state(struct drm_crtc *crtc,
+			       struct drm_crtc_state *state)
+{
+	struct nv50_head_atom *asyh = nv50_head_atom(state);
+	__drm_atomic_helper_crtc_destroy_state(&asyh->state);
+	kfree(asyh);
+}
+
+static struct drm_crtc_state *
+nv50_head_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+	struct nv50_head_atom *armh = nv50_head_atom(crtc->state);
+	struct nv50_head_atom *asyh;
+	if (!(asyh = kmalloc(sizeof(*asyh), GFP_KERNEL)))
+		return NULL;
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &asyh->state);
+	asyh->view = armh->view;
+	asyh->mode = armh->mode;
+	asyh->lut  = armh->lut;
+	asyh->core = armh->core;
+	asyh->curs = armh->curs;
+	asyh->base = armh->base;
+	asyh->ovly = armh->ovly;
+	asyh->dither = armh->dither;
+	asyh->procamp = armh->procamp;
+	asyh->clr.mask = 0;
+	asyh->set.mask = 0;
+	return &asyh->state;
+}
+
+static void
+__drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
+			       struct drm_crtc_state *state)
+{
+	if (crtc->state)
+		crtc->funcs->atomic_destroy_state(crtc, crtc->state);
+	crtc->state = state;
+	crtc->state->crtc = crtc;
+}
+
+static void
+nv50_head_reset(struct drm_crtc *crtc)
+{
+	struct nv50_head_atom *asyh;
+
+	if (WARN_ON(!(asyh = kzalloc(sizeof(*asyh), GFP_KERNEL))))
+		return;
+
+	__drm_atomic_helper_crtc_reset(crtc, &asyh->state);
+}
+
 static const struct drm_crtc_funcs nv50_crtc_func = {
+	.reset = nv50_head_reset,
 	.cursor_set = nv50_crtc_cursor_set,
 	.cursor_move = nv50_crtc_cursor_move,
 	.gamma_set = nv50_crtc_gamma_set,
-	.set_config = nouveau_crtc_set_config,
 	.destroy = nv50_crtc_destroy,
-	.page_flip = nouveau_crtc_page_flip,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = nv50_head_page_flip,
+	.set_property = drm_atomic_helper_crtc_set_property,
+	.atomic_duplicate_state = nv50_head_atomic_duplicate_state,
+	.atomic_destroy_state = nv50_head_atomic_destroy_state,
 };
 
 static int
@@ -2734,7 +2997,9 @@ nv50_crtc_create(struct drm_device *dev, int index)
 	head->_base = base;
 	head->_curs = curs;
 
-	drm_crtc_init(dev, crtc, &nv50_crtc_func);
+	drm_crtc_init_with_planes(dev, crtc, &base->wndw.plane,
+				  &curs->wndw.plane, &nv50_crtc_func,
+				  "head-%d", head->base.index);
 	drm_crtc_helper_add(crtc, &nv50_crtc_hfunc);
 	drm_mode_crtc_set_gamma_size(crtc, 256);
 
@@ -2815,30 +3080,15 @@ nv50_outp_atomic_check_view(struct drm_encoder *encoder,
 	return 0;
 }
 
-static bool
-nv50_encoder_mode_fixup(struct drm_encoder *encoder,
-			const struct drm_display_mode *mode,
-			struct drm_display_mode *adjusted_mode)
+static int
+nv50_outp_atomic_check(struct drm_encoder *encoder,
+		       struct drm_crtc_state *crtc_state,
+		       struct drm_connector_state *conn_state)
 {
-	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
-	struct nouveau_connector *nv_connector;
-
-	nv_connector = nouveau_encoder_connector_get(nv_encoder);
-	if (nv_connector && nv_connector->native_mode) {
-		struct nouveau_conn_atom *asyc
-			= nouveau_conn_atom(nv_connector->base.state);
-		struct drm_crtc_state crtc_state = {
-			.mode = *mode,
-			.adjusted_mode = *adjusted_mode,
-		};
-
-		nv50_outp_atomic_check_view(encoder, &crtc_state, &asyc->state,
-					    nv_connector->native_mode);
-		nv_connector->scaling_full = asyc->scaler.full;
-		drm_mode_copy(adjusted_mode, &crtc_state.adjusted_mode);
-	}
-
-	return true;
+	struct nouveau_connector *nv_connector =
+		nouveau_connector(conn_state->connector);
+	return nv50_outp_atomic_check_view(encoder, crtc_state, conn_state,
+					   nv_connector->native_mode);
 }
 
 /******************************************************************************
@@ -2869,7 +3119,7 @@ nv50_dac_dpms(struct drm_encoder *encoder, int mode)
 }
 
 static void
-nv50_dac_disconnect(struct drm_encoder *encoder)
+nv50_dac_disable(struct drm_encoder *encoder)
 {
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nv50_mast *mast = nv50_mast(encoder->dev);
@@ -2877,8 +3127,6 @@ nv50_dac_disconnect(struct drm_encoder *encoder)
 	u32 *push;
 
 	if (nv_encoder->crtc) {
-		nv50_crtc_prepare(nv_encoder->crtc);
-
 		push = evo_wait(mast, 4);
 		if (push) {
 			if (nv50_vers(mast) < GF110_DISP_CORE_CHANNEL_DMA) {
@@ -2896,16 +3144,14 @@ nv50_dac_disconnect(struct drm_encoder *encoder)
 }
 
 static void
-nv50_dac_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
-		  struct drm_display_mode *adjusted_mode)
+nv50_dac_enable(struct drm_encoder *encoder)
 {
 	struct nv50_mast *mast = nv50_mast(encoder->dev);
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
+	struct drm_display_mode *mode = &nv_crtc->base.state->adjusted_mode;
 	u32 *push;
 
-	nv50_dac_dpms(encoder, DRM_MODE_DPMS_ON);
-
 	push = evo_wait(mast, 8);
 	if (push) {
 		if (nv50_vers(mast) < GF110_DISP_CORE_CHANNEL_DMA) {
@@ -2974,10 +3220,9 @@ nv50_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
 static const struct drm_encoder_helper_funcs
 nv50_dac_help = {
 	.dpms = nv50_dac_dpms,
-	.mode_fixup = nv50_encoder_mode_fixup,
-	.prepare = nv50_dac_disconnect,
-	.mode_set = nv50_dac_mode_set,
-	.disable = nv50_dac_disconnect,
+	.atomic_check = nv50_outp_atomic_check,
+	.enable = nv50_dac_enable,
+	.disable = nv50_dac_disable,
 	.get_crtc = nv50_display_crtc_get,
 	.detect = nv50_dac_detect
 };
@@ -3311,7 +3556,7 @@ nv50_sor_ctrl(struct nouveau_encoder *nv_encoder, u32 mask, u32 data)
 }
 
 static void
-nv50_sor_disconnect(struct drm_encoder *encoder)
+nv50_sor_disable(struct drm_encoder *encoder)
 {
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(nv_encoder->crtc);
@@ -3320,7 +3565,18 @@ nv50_sor_disconnect(struct drm_encoder *encoder)
 	nv_encoder->crtc = NULL;
 
 	if (nv_crtc) {
-		nv50_crtc_prepare(&nv_crtc->base);
+		struct nvkm_i2c_aux *aux = nv_encoder->aux;
+		u8 pwr;
+
+		if (aux) {
+			int ret = nvkm_rdaux(aux, DP_SET_POWER, &pwr, 1);
+			if (ret == 0) {
+				pwr &= ~DP_SET_POWER_MASK;
+				pwr |=  DP_SET_POWER_D3;
+				nvkm_wraux(aux, DP_SET_POWER, &pwr, 1);
+			}
+		}
+
 		nv50_sor_ctrl(nv_encoder, 1 << nv_crtc->index, 0);
 		nv50_audio_disable(encoder, nv_crtc);
 		nv50_hdmi_disable(&nv_encoder->base.base, nv_crtc);
@@ -3328,11 +3584,11 @@ nv50_sor_disconnect(struct drm_encoder *encoder)
 }
 
 static void
-nv50_sor_mode_set(struct drm_encoder *encoder, struct drm_display_mode *umode,
-		  struct drm_display_mode *mode)
+nv50_sor_enable(struct drm_encoder *encoder)
 {
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
+	struct drm_display_mode *mode = &nv_crtc->base.state->adjusted_mode;
 	struct {
 		struct nv50_disp_mthd_v1 base;
 		struct nv50_disp_sor_lvds_script_v0 lvds;
@@ -3428,8 +3684,6 @@ nv50_sor_mode_set(struct drm_encoder *encoder, struct drm_display_mode *umode,
 		break;
 	}
 
-	nv50_sor_dpms(&nv_encoder->base.base, DRM_MODE_DPMS_ON);
-
 	if (nv50_vers(mast) >= GF110_DISP) {
 		u32 *push = evo_wait(mast, 3);
 		if (push) {
@@ -3467,10 +3721,9 @@ nv50_sor_mode_set(struct drm_encoder *encoder, struct drm_display_mode *umode,
 static const struct drm_encoder_helper_funcs
 nv50_sor_help = {
 	.dpms = nv50_sor_dpms,
-	.mode_fixup = nv50_encoder_mode_fixup,
-	.prepare = nv50_sor_disconnect,
-	.mode_set = nv50_sor_mode_set,
-	.disable = nv50_sor_disconnect,
+	.atomic_check = nv50_outp_atomic_check,
+	.enable = nv50_sor_enable,
+	.disable = nv50_sor_disable,
 	.get_crtc = nv50_display_crtc_get,
 };
 
@@ -3572,19 +3825,20 @@ nv50_pior_dpms(struct drm_encoder *encoder, int mode)
 	nvif_mthd(disp->disp, 0, &args, sizeof(args));
 }
 
-static bool
-nv50_pior_mode_fixup(struct drm_encoder *encoder,
-		     const struct drm_display_mode *mode,
-		     struct drm_display_mode *adjusted_mode)
+static int
+nv50_pior_atomic_check(struct drm_encoder *encoder,
+		       struct drm_crtc_state *crtc_state,
+		       struct drm_connector_state *conn_state)
 {
-	if (!nv50_encoder_mode_fixup(encoder, mode, adjusted_mode))
-		return false;
-	adjusted_mode->clock *= 2;
-	return true;
+	int ret = nv50_outp_atomic_check(encoder, crtc_state, conn_state);
+	if (ret)
+		return ret;
+	crtc_state->adjusted_mode.clock *= 2;
+	return 0;
 }
 
 static void
-nv50_pior_disconnect(struct drm_encoder *encoder)
+nv50_pior_disable(struct drm_encoder *encoder)
 {
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nv50_mast *mast = nv50_mast(encoder->dev);
@@ -3592,8 +3846,6 @@ nv50_pior_disconnect(struct drm_encoder *encoder)
 	u32 *push;
 
 	if (nv_encoder->crtc) {
-		nv50_crtc_prepare(nv_encoder->crtc);
-
 		push = evo_wait(mast, 4);
 		if (push) {
 			if (nv50_vers(mast) < GF110_DISP_CORE_CHANNEL_DMA) {
@@ -3608,13 +3860,13 @@ nv50_pior_disconnect(struct drm_encoder *encoder)
 }
 
 static void
-nv50_pior_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
-		   struct drm_display_mode *adjusted_mode)
+nv50_pior_enable(struct drm_encoder *encoder)
 {
 	struct nv50_mast *mast = nv50_mast(encoder->dev);
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
 	struct nouveau_connector *nv_connector;
+	struct drm_display_mode *mode = &nv_crtc->base.state->adjusted_mode;
 	u8 owner = 1 << nv_crtc->index;
 	u8 proto, depth;
 	u32 *push;
@@ -3637,8 +3889,6 @@ nv50_pior_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 		break;
 	}
 
-	nv50_pior_dpms(encoder, DRM_MODE_DPMS_ON);
-
 	push = evo_wait(mast, 8);
 	if (push) {
 		if (nv50_vers(mast) < GF110_DISP_CORE_CHANNEL_DMA) {
@@ -3660,10 +3910,9 @@ nv50_pior_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 static const struct drm_encoder_helper_funcs
 nv50_pior_help = {
 	.dpms = nv50_pior_dpms,
-	.mode_fixup = nv50_pior_mode_fixup,
-	.prepare = nv50_pior_disconnect,
-	.mode_set = nv50_pior_mode_set,
-	.disable = nv50_pior_disconnect,
+	.atomic_check = nv50_pior_atomic_check,
+	.enable = nv50_pior_enable,
+	.disable = nv50_pior_disable,
 	.get_crtc = nv50_display_crtc_get,
 };
 
@@ -3775,11 +4024,10 @@ nv50_fb_ctor(struct drm_framebuffer *fb)
 	nv_fb->r_handle = 0xffff0000 | kind;
 
 	list_for_each_entry(crtc, &drm->dev->mode_config.crtc_list, head) {
-		struct nv50_head *head = nv50_head(crtc);
+		struct nv50_wndw *wndw = nv50_wndw(crtc->primary);
 		struct nv50_dmac_ctxdma *ctxdma;
 
-		ctxdma = nv50_dmac_ctxdma_new(&head->_base->chan.base,
-					      nv_fb->r_handle, nv_fb);
+		ctxdma = nv50_dmac_ctxdma_new(wndw->dmac, nv_fb->r_handle, nv_fb);
 		if (IS_ERR(ctxdma))
 			return PTR_ERR(ctxdma);
 	}
@@ -3787,6 +4035,436 @@ nv50_fb_ctor(struct drm_framebuffer *fb)
 	return 0;
 }
 
+/******************************************************************************
+ * Atomic
+ *****************************************************************************/
+
+static void
+nv50_disp_atomic_commit_core(struct nouveau_drm *drm, u32 interlock)
+{
+	struct nv50_disp *disp = nv50_disp(drm->dev);
+	struct nv50_dmac *core = &disp->mast.base;
+	u32 *push;
+
+	NV_ATOMIC(drm, "commit core %08x\n", interlock);
+
+	if ((push = evo_wait(core, 5))) {
+		evo_mthd(push, 0x0084, 1);
+		evo_data(push, 0x80000000);
+		evo_mthd(push, 0x0080, 2);
+		evo_data(push, interlock);
+		evo_data(push, 0x00000000);
+		nouveau_bo_wr32(disp->sync, 0, 0x00000000);
+		evo_kick(push, core);
+		if (nvif_msec(&drm->device, 2000ULL,
+			if (nouveau_bo_rd32(disp->sync, 0))
+				break;
+			usleep_range(1, 2);
+		) < 0)
+			NV_ERROR(drm, "EVO timeout\n");
+	}
+}
+
+static void
+nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
+{
+	struct drm_device *dev = state->dev;
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	struct drm_plane_state *plane_state;
+	struct drm_plane *plane;
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nv50_disp *disp = nv50_disp(dev);
+	struct nv50_atom *atom = nv50_atom(state);
+	struct nv50_outp_atom *outp, *outt;
+	u32 interlock_core = 0;
+	u32 interlock_chan = 0;
+	int i;
+
+	NV_ATOMIC(drm, "commit %d %d\n", atom->lock_core, atom->flush_disable);
+	drm_atomic_helper_wait_for_fences(dev, state, false);
+	drm_atomic_helper_wait_for_dependencies(state);
+	drm_atomic_helper_update_legacy_modeset_state(dev, state);
+
+	if (atom->lock_core)
+		mutex_lock(&disp->mutex);
+
+	/* Disable head(s). */
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		struct nv50_head_atom *asyh = nv50_head_atom(crtc->state);
+		struct nv50_head *head = nv50_head(crtc);
+
+		NV_ATOMIC(drm, "%s: clr %04x (set %04x)\n", crtc->name,
+			  asyh->clr.mask, asyh->set.mask);
+
+		if (asyh->clr.mask) {
+			nv50_head_flush_clr(head, asyh, atom->flush_disable);
+			interlock_core |= 1;
+		}
+	}
+
+	/* Disable plane(s). */
+	for_each_plane_in_state(state, plane, plane_state, i) {
+		struct nv50_wndw_atom *asyw = nv50_wndw_atom(plane->state);
+		struct nv50_wndw *wndw = nv50_wndw(plane);
+
+		NV_ATOMIC(drm, "%s: clr %02x (set %02x)\n", plane->name,
+			  asyw->clr.mask, asyw->set.mask);
+		if (!asyw->clr.mask)
+			continue;
+
+		interlock_chan |= nv50_wndw_flush_clr(wndw, interlock_core,
+						      atom->flush_disable,
+						      asyw);
+	}
+
+	/* Disable output path(s). */
+	list_for_each_entry(outp, &atom->outp, head) {
+		const struct drm_encoder_helper_funcs *help;
+		struct drm_encoder *encoder;
+
+		encoder = outp->encoder;
+		help = encoder->helper_private;
+
+		NV_ATOMIC(drm, "%s: clr %02x (set %02x)\n", encoder->name,
+			  outp->clr.mask, outp->set.mask);
+
+		if (outp->clr.mask) {
+			help->disable(encoder);
+			interlock_core |= 1;
+			if (outp->flush_disable) {
+				nv50_disp_atomic_commit_core(drm, interlock_chan);
+				interlock_core = 0;
+				interlock_chan = 0;
+			}
+		}
+	}
+
+	/* Flush disable. */
+	if (interlock_core) {
+		if (atom->flush_disable) {
+			nv50_disp_atomic_commit_core(drm, interlock_chan);
+			interlock_core = 0;
+			interlock_chan = 0;
+		}
+	}
+
+	/* Update output path(s). */
+	list_for_each_entry_safe(outp, outt, &atom->outp, head) {
+		const struct drm_encoder_helper_funcs *help;
+		struct drm_encoder *encoder;
+
+		encoder = outp->encoder;
+		help = encoder->helper_private;
+
+		NV_ATOMIC(drm, "%s: set %02x (clr %02x)\n", encoder->name,
+			  outp->set.mask, outp->clr.mask);
+
+		if (outp->set.mask) {
+			help->enable(encoder);
+			interlock_core = 1;
+		}
+
+		list_del(&outp->head);
+		kfree(outp);
+	}
+
+	/* Update head(s). */
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		struct nv50_head_atom *asyh = nv50_head_atom(crtc->state);
+		struct nv50_head *head = nv50_head(crtc);
+
+		NV_ATOMIC(drm, "%s: set %04x (clr %04x)\n", crtc->name,
+			  asyh->set.mask, asyh->clr.mask);
+
+		if (asyh->set.mask) {
+			nv50_head_flush_set(head, asyh);
+			interlock_core = 1;
+		}
+	}
+
+	/* Update plane(s). */
+	for_each_plane_in_state(state, plane, plane_state, i) {
+		struct nv50_wndw_atom *asyw = nv50_wndw_atom(plane->state);
+		struct nv50_wndw *wndw = nv50_wndw(plane);
+
+		NV_ATOMIC(drm, "%s: set %02x (clr %02x)\n", plane->name,
+			  asyw->set.mask, asyw->clr.mask);
+		if ( !asyw->set.mask &&
+		    (!asyw->clr.mask || atom->flush_disable))
+			continue;
+
+		interlock_chan |= nv50_wndw_flush_set(wndw, interlock_core, asyw);
+	}
+
+	/* Flush update. */
+	if (interlock_core) {
+		if (!interlock_chan && atom->state.legacy_cursor_update) {
+			u32 *push = evo_wait(&disp->mast, 2);
+			if (push) {
+				evo_mthd(push, 0x0080, 1);
+				evo_data(push, 0x00000000);
+				evo_kick(push, &disp->mast);
+			}
+		} else {
+			nv50_disp_atomic_commit_core(drm, interlock_chan);
+		}
+	}
+
+	if (atom->lock_core)
+		mutex_unlock(&disp->mutex);
+
+	/* Wait for HW to signal completion. */
+	for_each_plane_in_state(state, plane, plane_state, i) {
+		struct nv50_wndw_atom *asyw = nv50_wndw_atom(plane->state);
+		struct nv50_wndw *wndw = nv50_wndw(plane);
+		int ret = nv50_wndw_wait_armed(wndw, asyw);
+		if (ret)
+			NV_ERROR(drm, "%s: timeout\n", plane->name);
+	}
+
+	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		if (crtc->state->event) {
+			unsigned long flags;
+			spin_lock_irqsave(&crtc->dev->event_lock, flags);
+			drm_crtc_send_vblank_event(crtc, crtc->state->event);
+			spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+			crtc->state->event = NULL;
+		}
+	}
+
+	drm_atomic_helper_commit_hw_done(state);
+	drm_atomic_helper_cleanup_planes(dev, state);
+	drm_atomic_helper_commit_cleanup_done(state);
+	drm_atomic_state_put(state);
+}
+
+static void
+nv50_disp_atomic_commit_work(struct work_struct *work)
+{
+	struct drm_atomic_state *state =
+		container_of(work, typeof(*state), commit_work);
+	nv50_disp_atomic_commit_tail(state);
+}
+
+static int
+nv50_disp_atomic_commit(struct drm_device *dev,
+			struct drm_atomic_state *state, bool nonblock)
+{
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nv50_disp *disp = nv50_disp(dev);
+	struct drm_plane_state *plane_state;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc;
+	bool active = false;
+	int ret, i;
+
+	ret = pm_runtime_get_sync(dev->dev);
+	if (ret < 0 && ret != -EACCES)
+		return ret;
+
+	ret = drm_atomic_helper_setup_commit(state, nonblock);
+	if (ret)
+		goto done;
+
+	INIT_WORK(&state->commit_work, nv50_disp_atomic_commit_work);
+
+	ret = drm_atomic_helper_prepare_planes(dev, state);
+	if (ret)
+		goto done;
+
+	if (!nonblock) {
+		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
+		if (ret)
+			goto done;
+	}
+
+	for_each_plane_in_state(state, plane, plane_state, i) {
+		struct nv50_wndw_atom *asyw = nv50_wndw_atom(plane_state);
+		struct nv50_wndw *wndw = nv50_wndw(plane);
+		if (asyw->set.image) {
+			asyw->ntfy.handle = wndw->dmac->sync.handle;
+			asyw->ntfy.offset = wndw->ntfy;
+			asyw->ntfy.awaken = false;
+			asyw->set.ntfy = true;
+			nouveau_bo_wr32(disp->sync, wndw->ntfy / 4, 0x00000000);
+			wndw->ntfy ^= 0x10;
+		}
+	}
+
+	drm_atomic_helper_swap_state(state, true);
+	drm_atomic_state_get(state);
+
+	if (nonblock)
+		queue_work(system_unbound_wq, &state->commit_work);
+	else
+		nv50_disp_atomic_commit_tail(state);
+
+	drm_for_each_crtc(crtc, dev) {
+		if (crtc->state->enable) {
+			if (!drm->have_disp_power_ref) {
+				drm->have_disp_power_ref = true;
+				return ret;
+			}
+			active = true;
+			break;
+		}
+	}
+
+	if (!active && drm->have_disp_power_ref) {
+		pm_runtime_put_autosuspend(dev->dev);
+		drm->have_disp_power_ref = false;
+	}
+
+done:
+	pm_runtime_put_autosuspend(dev->dev);
+	return ret;
+}
+
+static struct nv50_outp_atom *
+nv50_disp_outp_atomic_add(struct nv50_atom *atom, struct drm_encoder *encoder)
+{
+	struct nv50_outp_atom *outp;
+
+	list_for_each_entry(outp, &atom->outp, head) {
+		if (outp->encoder == encoder)
+			return outp;
+	}
+
+	outp = kzalloc(sizeof(*outp), GFP_KERNEL);
+	if (!outp)
+		return ERR_PTR(-ENOMEM);
+
+	list_add(&outp->head, &atom->outp);
+	outp->encoder = encoder;
+	return outp;
+}
+
+static int
+nv50_disp_outp_atomic_check_clr(struct nv50_atom *atom,
+				struct drm_connector *connector)
+{
+	struct drm_encoder *encoder = connector->state->best_encoder;
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	struct nv50_outp_atom *outp;
+
+	if (!(crtc = connector->state->crtc))
+		return 0;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(&atom->state, crtc);
+	if (crtc->state->active && drm_atomic_crtc_needs_modeset(crtc_state)) {
+		outp = nv50_disp_outp_atomic_add(atom, encoder);
+		if (IS_ERR(outp))
+			return PTR_ERR(outp);
+
+		if (outp->encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
+			outp->flush_disable = true;
+			atom->flush_disable = true;
+		}
+		outp->clr.ctrl = true;
+		atom->lock_core = true;
+	}
+
+	return 0;
+}
+
+static int
+nv50_disp_outp_atomic_check_set(struct nv50_atom *atom,
+				struct drm_connector_state *connector_state)
+{
+	struct drm_encoder *encoder = connector_state->best_encoder;
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	struct nv50_outp_atom *outp;
+
+	if (!(crtc = connector_state->crtc))
+		return 0;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(&atom->state, crtc);
+	if (crtc_state->active && drm_atomic_crtc_needs_modeset(crtc_state)) {
+		outp = nv50_disp_outp_atomic_add(atom, encoder);
+		if (IS_ERR(outp))
+			return PTR_ERR(outp);
+
+		outp->set.ctrl = true;
+		atom->lock_core = true;
+	}
+
+	return 0;
+}
+
+static int
+nv50_disp_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
+{
+	struct nv50_atom *atom = nv50_atom(state);
+	struct drm_connector_state *connector_state;
+	struct drm_connector *connector;
+	int ret, i;
+
+	ret = drm_atomic_helper_check(dev, state);
+	if (ret)
+		return ret;
+
+	for_each_connector_in_state(state, connector, connector_state, i) {
+		ret = nv50_disp_outp_atomic_check_clr(atom, connector);
+		if (ret)
+			return ret;
+
+		ret = nv50_disp_outp_atomic_check_set(atom, connector_state);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void
+nv50_disp_atomic_state_clear(struct drm_atomic_state *state)
+{
+	struct nv50_atom *atom = nv50_atom(state);
+	struct nv50_outp_atom *outp, *outt;
+
+	list_for_each_entry_safe(outp, outt, &atom->outp, head) {
+		list_del(&outp->head);
+		kfree(outp);
+	}
+
+	drm_atomic_state_default_clear(state);
+}
+
+static void
+nv50_disp_atomic_state_free(struct drm_atomic_state *state)
+{
+	struct nv50_atom *atom = nv50_atom(state);
+	drm_atomic_state_default_release(&atom->state);
+	kfree(atom);
+}
+
+static struct drm_atomic_state *
+nv50_disp_atomic_state_alloc(struct drm_device *dev)
+{
+	struct nv50_atom *atom;
+	if (!(atom = kzalloc(sizeof(*atom), GFP_KERNEL)) ||
+	    drm_atomic_state_init(dev, &atom->state) < 0) {
+		kfree(atom);
+		return NULL;
+	}
+	INIT_LIST_HEAD(&atom->outp);
+	return &atom->state;
+}
+
+static const struct drm_mode_config_funcs
+nv50_disp_func = {
+	.fb_create = nouveau_user_framebuffer_create,
+	.output_poll_changed = nouveau_fbcon_output_poll_changed,
+	.atomic_check = nv50_disp_atomic_check,
+	.atomic_commit = nv50_disp_atomic_commit,
+	.atomic_state_alloc = nv50_disp_atomic_state_alloc,
+	.atomic_state_clear = nv50_disp_atomic_state_clear,
+	.atomic_state_free = nv50_disp_atomic_state_free,
+};
+
 /******************************************************************************
  * Init
  *****************************************************************************/
@@ -3872,6 +4550,10 @@ nv50_display_destroy(struct drm_device *dev)
 	kfree(disp);
 }
 
+MODULE_PARM_DESC(atomic, "Expose atomic ioctl (default: disabled)");
+static int nouveau_atomic = 0;
+module_param_named(atomic, nouveau_atomic, int, 0400);
+
 int
 nv50_display_create(struct drm_device *dev)
 {
@@ -3887,6 +4569,8 @@ nv50_display_create(struct drm_device *dev)
 	if (!disp)
 		return -ENOMEM;
 
+	mutex_init(&disp->mutex);
+
 	nouveau_display(dev)->priv = disp;
 	nouveau_display(dev)->dtor = nv50_display_destroy;
 	nouveau_display(dev)->init = nv50_display_init;
@@ -3894,6 +4578,9 @@ nv50_display_create(struct drm_device *dev)
 	nouveau_display(dev)->fb_ctor = nv50_fb_ctor;
 	nouveau_display(dev)->fb_dtor = nv50_fb_dtor;
 	disp->disp = &nouveau_display(dev)->disp;
+	dev->mode_config.funcs = &nv50_disp_func;
+	if (nouveau_atomic)
+		dev->driver->driver_features |= DRIVER_ATOMIC;
 
 	/* small shared memory area we use for notifiers and semaphores */
 	ret = nouveau_bo_new(dev, 4096, 0x1000, TTM_PL_FLAG_VRAM,