diff --git a/drivers/gpu/drm/nouveau/include/nvif/cl5070.h b/drivers/gpu/drm/nouveau/include/nvif/cl5070.h
index e3f5659295e2..542d95145a67 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/cl5070.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/cl5070.h
@@ -27,6 +27,8 @@ struct nv50_disp_scanoutpos_v0 {
 
 struct nv50_disp_mthd_v1 {
 	__u8  version;
+#define NV50_DISP_MTHD_V1_ACQUIRE                                          0x01
+#define NV50_DISP_MTHD_V1_RELEASE                                          0x02
 #define NV50_DISP_MTHD_V1_DAC_LOAD                                         0x11
 #define NV50_DISP_MTHD_V1_SOR_HDA_ELD                                      0x21
 #define NV50_DISP_MTHD_V1_SOR_HDMI_PWR                                     0x22
@@ -39,6 +41,13 @@ struct nv50_disp_mthd_v1 {
 	__u8  pad06[2];
 };
 
+struct nv50_disp_acquire_v0 {
+	__u8  version;
+	__u8  or;
+	__u8  link;
+	__u8  pad03[5];
+};
+
 struct nv50_disp_dac_load_v0 {
 	__u8  version;
 	__u8  load;
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 9a0772ad495a..b998c33af18a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -1533,7 +1533,8 @@ parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
 	if (conf & 0x100000)
 		entry->i2c_upper_default = true;
 
-	entry->hasht = (entry->location << 4) | entry->type;
+	entry->hasht = (entry->extdev << 8) | (entry->location << 4) |
+			entry->type;
 	entry->hashm = (entry->heads << 8) | (link << 6) | entry->or;
 	return true;
 }
diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
index 198e5f27682f..e28d966946a1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
+++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
@@ -42,6 +42,7 @@ struct nouveau_encoder {
 
 	struct dcb_output *dcb;
 	int or;
+	int link;
 
 	struct i2c_adapter *i2c;
 	struct nvkm_i2c_aux *aux;
diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index e6cc1d843c92..e3132a2ce34d 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -2403,6 +2403,51 @@ out:
 /******************************************************************************
  * Output path helpers
  *****************************************************************************/
+static void
+nv50_outp_release(struct nouveau_encoder *nv_encoder)
+{
+	struct nv50_disp *disp = nv50_disp(nv_encoder->base.base.dev);
+	struct {
+		struct nv50_disp_mthd_v1 base;
+	} args = {
+		.base.version = 1,
+		.base.method = NV50_DISP_MTHD_V1_RELEASE,
+		.base.hasht  = nv_encoder->dcb->hasht,
+		.base.hashm  = nv_encoder->dcb->hashm,
+	};
+
+	nvif_mthd(disp->disp, 0, &args, sizeof(args));
+	nv_encoder->or = -1;
+	nv_encoder->link = 0;
+}
+
+static int
+nv50_outp_acquire(struct nouveau_encoder *nv_encoder)
+{
+	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+	struct nv50_disp *disp = nv50_disp(drm->dev);
+	struct {
+		struct nv50_disp_mthd_v1 base;
+		struct nv50_disp_acquire_v0 info;
+	} args = {
+		.base.version = 1,
+		.base.method = NV50_DISP_MTHD_V1_ACQUIRE,
+		.base.hasht  = nv_encoder->dcb->hasht,
+		.base.hashm  = nv_encoder->dcb->hashm,
+	};
+	int ret;
+
+	ret = nvif_mthd(disp->disp, 0, &args, sizeof(args));
+	if (ret) {
+		NV_ERROR(drm, "error acquiring output path: %d\n", ret);
+		return ret;
+	}
+
+	nv_encoder->or = args.info.or;
+	nv_encoder->link = args.info.link;
+	return 0;
+}
+
 static int
 nv50_outp_atomic_check_view(struct drm_encoder *encoder,
 			    struct drm_crtc_state *crtc_state,
@@ -2482,6 +2527,7 @@ nv50_dac_disable(struct drm_encoder *encoder)
 	}
 
 	nv_encoder->crtc = NULL;
+	nv50_outp_release(nv_encoder);
 }
 
 static void
@@ -2493,6 +2539,8 @@ nv50_dac_enable(struct drm_encoder *encoder)
 	struct drm_display_mode *mode = &nv_crtc->base.state->adjusted_mode;
 	u32 *push;
 
+	nv50_outp_acquire(nv_encoder);
+
 	push = evo_wait(mast, 8);
 	if (push) {
 		if (nv50_vers(mast) < GF110_DISP_CORE_CHANNEL_DMA) {
@@ -2592,7 +2640,6 @@ nv50_dac_create(struct drm_connector *connector, struct dcb_output *dcbe)
 	if (!nv_encoder)
 		return -ENOMEM;
 	nv_encoder->dcb = dcbe;
-	nv_encoder->or = ffs(dcbe->or) - 1;
 
 	bus = nvkm_i2c_bus_find(i2c, dcbe->i2c_index);
 	if (bus)
@@ -2759,6 +2806,8 @@ struct nv50_mstm {
 	struct nv50_msto *msto[4];
 
 	bool modified;
+	bool disabled;
+	int links;
 };
 
 struct nv50_mstc {
@@ -2907,7 +2956,10 @@ nv50_msto_enable(struct drm_encoder *encoder)
 	r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, mstc->pbn, slots);
 	WARN_ON(!r);
 
-	if (mstm->outp->dcb->sorconf.link & 1)
+	if (!mstm->links++)
+		nv50_outp_acquire(mstm->outp);
+
+	if (mstm->outp->link & 1)
 		proto = 0x8;
 	else
 		proto = 0x9;
@@ -2939,6 +2991,8 @@ nv50_msto_disable(struct drm_encoder *encoder)
 
 	mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
 	mstm->modified = true;
+	if (!--mstm->links)
+		mstm->disabled = true;
 	msto->disabled = true;
 }
 
@@ -3154,6 +3208,12 @@ nv50_mstm_prepare(struct nv50_mstm *mstm)
 				nv50_msto_prepare(msto);
 		}
 	}
+
+	if (mstm->disabled) {
+		if (!mstm->links)
+			nv50_outp_release(mstm->outp);
+		mstm->disabled = false;
+	}
 }
 
 static void
@@ -3452,6 +3512,7 @@ nv50_sor_disable(struct drm_encoder *encoder)
 		nv_encoder->update(nv_encoder, nv_crtc->index, NULL, 0, 0);
 		nv50_audio_disable(encoder, nv_crtc);
 		nv50_hdmi_disable(&nv_encoder->base.base, nv_crtc);
+		nv50_outp_release(nv_encoder);
 	}
 }
 
@@ -3480,10 +3541,11 @@ nv50_sor_enable(struct drm_encoder *encoder)
 
 	nv_connector = nouveau_encoder_connector_get(nv_encoder);
 	nv_encoder->crtc = encoder->crtc;
+	nv50_outp_acquire(nv_encoder);
 
 	switch (nv_encoder->dcb->type) {
 	case DCB_OUTPUT_TMDS:
-		if (nv_encoder->dcb->sorconf.link & 1) {
+		if (nv_encoder->link & 1) {
 			proto = 0x1;
 			/* Only enable dual-link if:
 			 *  - Need to (i.e. rate > 165MHz)
@@ -3541,7 +3603,7 @@ nv50_sor_enable(struct drm_encoder *encoder)
 		else
 			depth = 0x6;
 
-		if (nv_encoder->dcb->sorconf.link & 1)
+		if (nv_encoder->link & 1)
 			proto = 0x8;
 		else
 			proto = 0x9;
@@ -3600,7 +3662,6 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_output *dcbe)
 	if (!nv_encoder)
 		return -ENOMEM;
 	nv_encoder->dcb = dcbe;
-	nv_encoder->or = ffs(dcbe->or) - 1;
 	nv_encoder->update = nv50_sor_update;
 
 	encoder = to_drm_encoder(nv_encoder);
@@ -3673,6 +3734,7 @@ nv50_pior_disable(struct drm_encoder *encoder)
 	}
 
 	nv_encoder->crtc = NULL;
+	nv50_outp_release(nv_encoder);
 }
 
 static void
@@ -3687,6 +3749,8 @@ nv50_pior_enable(struct drm_encoder *encoder)
 	u8 proto, depth;
 	u32 *push;
 
+	nv50_outp_acquire(nv_encoder);
+
 	nv_connector = nouveau_encoder_connector_get(nv_encoder);
 	switch (nv_connector->base.display_info.bpc) {
 	case 10: depth = 0x6; break;
@@ -3774,7 +3838,6 @@ nv50_pior_create(struct drm_connector *connector, struct dcb_output *dcbe)
 	if (!nv_encoder)
 		return -ENOMEM;
 	nv_encoder->dcb = dcbe;
-	nv_encoder->or = ffs(dcbe->or) - 1;
 	nv_encoder->i2c = ddc;
 	nv_encoder->aux = aux;
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
index b531890b1a6f..0f1c223cc7a8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
@@ -24,7 +24,6 @@
 #include "dp.h"
 #include "conn.h"
 #include "ior.h"
-#include "nv50.h"
 
 #include <subdev/bios.h>
 #include <subdev/bios/init.h>
@@ -351,7 +350,6 @@ static const struct dp_rates {
 static int
 nvkm_dp_train(struct nvkm_dp *dp, u32 dataKBps)
 {
-	struct nv50_disp *disp = nv50_disp(dp->outp.disp);
 	struct nvkm_ior *ior = dp->outp.ior;
 	const u8 sink_nr = dp->dpcd[DPCD_RC02] & DPCD_RC02_MAX_LANE_COUNT;
 	const u8 sink_bw = dp->dpcd[DPCD_RC01_MAX_LINK_RATE];
@@ -361,9 +359,6 @@ nvkm_dp_train(struct nvkm_dp *dp, u32 dataKBps)
 	int ret = -EINVAL;
 	u8  pwr;
 
-	if (!dp->outp.info.location && disp->func->sor.magic)
-		disp->func->sor.magic(&dp->outp);
-
 	/* Find the lowest configuration of the OR that can support
 	 * the required link rate.
 	 *
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c
index c0d730af4c97..7a8dff7b8c95 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c
@@ -306,9 +306,6 @@ gf119_disp_intr_unk2_2(struct nv50_disp *disp, int head)
 
 		if (nvkm_output_dp_train(outp, pclk))
 			OUTP_ERR(outp, "link not trained before attach");
-	} else {
-		if (disp->func->sor.magic)
-			disp->func->sor.magic(outp);
 	}
 
 	exec_clkcmp(disp, head, 0, pclk, &conf);
@@ -377,6 +374,7 @@ gf119_disp_super(struct work_struct *work)
 			nvkm_debug(subdev, "supervisor 2.0 - head %d\n", head->id);
 			gf119_disp_intr_unk2_0(disp, head->id);
 		}
+		nvkm_outp_route(&disp->base);
 		list_for_each_entry(head, &disp->base.head, head) {
 			if (!(mask[head->id] & 0x00010000))
 				continue;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gm200.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gm200.c
index ae0b97332e46..292d3b5f9704 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gm200.c
@@ -35,9 +35,7 @@ gm200_disp = {
 	.root = &gm200_disp_root_oclass,
 	.head.new = gf119_head_new,
 	.dac = { .nr = 3, .new = gf119_dac_new },
-	.sor.nr = 4,
-	.sor.new = gm200_sor_new,
-	.sor.magic = gm200_sor_magic,
+	.sor = { .nr = 4, .new = gm200_sor_new },
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp100.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp100.c
index c6fe7797a803..39eb98b2c3a2 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp100.c
@@ -34,9 +34,7 @@ gp100_disp = {
 	.super = gf119_disp_super,
 	.root = &gp100_disp_root_oclass,
 	.head.new = gf119_head_new,
-	.sor.nr = 4,
-	.sor.new = gm200_sor_new,
-	.sor.magic = gm200_sor_magic,
+	.sor = { .nr = 4, .new = gm200_sor_new },
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp102.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp102.c
index 279d125fe265..91d70fe18275 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp102.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/gp102.c
@@ -60,9 +60,7 @@ gp102_disp = {
 	.super = gf119_disp_super,
 	.root = &gp102_disp_root_oclass,
 	.head.new = gf119_head_new,
-	.sor.nr = 4,
-	.sor.new = gm200_sor_new,
-	.sor.magic = gm200_sor_magic,
+	.sor = { .nr = 4, .new = gm200_sor_new },
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
index a43a924debfe..a2e38d4780b1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h
@@ -17,6 +17,7 @@ struct nvkm_ior {
 	struct list_head head;
 
 	struct nvkm_ior_state {
+		struct nvkm_outp *outp;
 		unsigned rgdiv;
 		unsigned proto_evo:4;
 		enum nvkm_ior_proto {
@@ -40,6 +41,11 @@ struct nvkm_ior {
 };
 
 struct nvkm_ior_func {
+	struct {
+		int (*get)(struct nvkm_outp *, int *link);
+		void (*set)(struct nvkm_outp *, struct nvkm_ior *);
+	} route;
+
 	void (*state)(struct nvkm_ior *, struct nvkm_ior_state *);
 	void (*power)(struct nvkm_ior *, bool normal, bool pu,
 		      bool data, bool vsync, bool hsync);
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
index b7365b56ed19..58d46cefe7b1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
@@ -661,6 +661,7 @@ nv50_disp_super(struct work_struct *work)
 				continue;
 			nv50_disp_intr_unk20_0(disp, head->id);
 		}
+		nvkm_outp_route(&disp->base);
 		list_for_each_entry(head, &disp->base.head, head) {
 			if (!(super & (0x00000200 << head->id)))
 				continue;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.h
index f87422de12b3..65d445687038 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.h
@@ -53,7 +53,6 @@ struct nv50_disp_func {
 	struct {
 		int nr;
 		int (*new)(struct nvkm_disp *, int id);
-		void (*magic)(struct nvkm_output *);
 	} sor;
 
 	struct {
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
index 09e8ebbd4ee9..ef201f1597c7 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
@@ -28,8 +28,35 @@
 #include <subdev/bios/dcb.h>
 #include <subdev/i2c.h>
 
+void
+nvkm_outp_route(struct nvkm_disp *disp)
+{
+	struct nvkm_outp *outp;
+	struct nvkm_ior *ior;
+
+	list_for_each_entry(ior, &disp->ior, head) {
+		if ((outp = ior->arm.outp) && ior->arm.outp != ior->asy.outp) {
+			OUTP_DBG(outp, "release %s", ior->name);
+			if (ior->func->route.set)
+				ior->func->route.set(outp, NULL);
+			ior->arm.outp = NULL;
+		}
+	}
+
+	list_for_each_entry(ior, &disp->ior, head) {
+		if ((outp = ior->asy.outp)) {
+			OUTP_DBG(outp, "acquire %s", ior->name);
+			if (ior->asy.outp != ior->arm.outp) {
+				if (ior->func->route.set)
+					ior->func->route.set(outp, ior);
+				ior->arm.outp = ior->asy.outp;
+			}
+		}
+	}
+}
+
 static enum nvkm_ior_proto
-nvkm_outp_xlat(struct nvkm_output *outp, enum nvkm_ior_type *type)
+nvkm_outp_xlat(struct nvkm_outp *outp, enum nvkm_ior_type *type)
 {
 	switch (outp->info.location) {
 	case 0:
@@ -57,6 +84,75 @@ nvkm_outp_xlat(struct nvkm_output *outp, enum nvkm_ior_type *type)
 	return UNKNOWN;
 }
 
+void
+nvkm_outp_release(struct nvkm_outp *outp, u8 user)
+{
+	struct nvkm_ior *ior = outp->ior;
+	OUTP_TRACE(outp, "release %02x &= %02x %p", outp->acquired, ~user, ior);
+	if (ior) {
+		outp->acquired &= ~user;
+		if (!outp->acquired) {
+			outp->ior->asy.outp = NULL;
+			outp->ior = NULL;
+		}
+	}
+}
+
+static inline int
+nvkm_outp_acquire_ior(struct nvkm_outp *outp, u8 user, struct nvkm_ior *ior)
+{
+	outp->ior = ior;
+	outp->ior->asy.outp = outp;
+	outp->ior->asy.link = outp->info.sorconf.link;
+	outp->acquired |= user;
+	return 0;
+}
+
+int
+nvkm_outp_acquire(struct nvkm_outp *outp, u8 user)
+{
+	struct nvkm_ior *ior = outp->ior;
+	enum nvkm_ior_proto proto;
+	enum nvkm_ior_type type;
+
+	OUTP_TRACE(outp, "acquire %02x |= %02x %p", outp->acquired, user, ior);
+	if (ior) {
+		outp->acquired |= user;
+		return 0;
+	}
+
+	/* Lookup a compatible, and unused, OR to assign to the device. */
+	proto = nvkm_outp_xlat(outp, &type);
+	if (proto == UNKNOWN)
+		return -ENOSYS;
+
+	/* First preference is to reuse the OR that is currently armed
+	 * on HW, if any, in order to prevent unnecessary switching.
+	 */
+	list_for_each_entry(ior, &outp->disp->ior, head) {
+		if (!ior->asy.outp && ior->arm.outp == outp)
+			return nvkm_outp_acquire_ior(outp, user, ior);
+	}
+
+	/* Failing that, a completely unused OR is the next best thing. */
+	list_for_each_entry(ior, &outp->disp->ior, head) {
+		if (!ior->asy.outp && ior->type == type && !ior->arm.outp &&
+		    ior->id == __ffs(outp->info.or))
+			return nvkm_outp_acquire_ior(outp, user, ior);
+	}
+
+	/* Last resort is to assign an OR that's already active on HW,
+	 * but will be released during the next modeset.
+	 */
+	list_for_each_entry(ior, &outp->disp->ior, head) {
+		if (!ior->asy.outp && ior->type == type &&
+		    ior->id == __ffs(outp->info.or))
+			return nvkm_outp_acquire_ior(outp, user, ior);
+	}
+
+	return -ENOSPC;
+}
+
 void
 nvkm_outp_fini(struct nvkm_outp *outp)
 {
@@ -65,22 +161,36 @@ nvkm_outp_fini(struct nvkm_outp *outp)
 }
 
 static void
-nvkm_outp_init_route(struct nvkm_output *outp)
+nvkm_outp_init_route(struct nvkm_outp *outp)
 {
 	struct nvkm_disp *disp = outp->disp;
 	enum nvkm_ior_proto proto;
 	enum nvkm_ior_type type;
 	struct nvkm_ior *ior;
-	int id;
+	int id, link;
 
+	/* Find any OR from the class that is able to support this device. */
 	proto = nvkm_outp_xlat(outp, &type);
 	if (proto == UNKNOWN)
 		return;
 
+	ior = nvkm_ior_find(disp, type, -1);
+	if (!ior) {
+		WARN_ON(1);
+		return;
+	}
+
 	/* Determine the specific OR, if any, this device is attached to. */
-	if (1) {
+	if (ior->func->route.get) {
+		id = ior->func->route.get(outp, &link);
+		if (id < 0) {
+			OUTP_DBG(outp, "no route");
+			return;
+		}
+	} else {
 		/* Prior to DCB 4.1, this is hardwired like so. */
-		id = ffs(outp->info.or) - 1;
+		id   = ffs(outp->info.or) - 1;
+		link = (ior->type == SOR) ? outp->info.sorconf.link : 0;
 	}
 
 	ior = nvkm_ior_find(disp, type, id);
@@ -89,7 +199,16 @@ nvkm_outp_init_route(struct nvkm_output *outp)
 		return;
 	}
 
-	outp->ior = ior;
+	/* Determine if the OR is already configured for this device. */
+	ior->func->state(ior, &ior->arm);
+	if (!ior->arm.head || ior->arm.proto != proto) {
+		OUTP_DBG(outp, "no heads (%x %d %d)", ior->arm.head,
+			 ior->arm.proto, proto);
+		return;
+	}
+
+	OUTP_DBG(outp, "on %s link %x", ior->name, ior->arm.link);
+	ior->arm.outp = outp;
 }
 
 void
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
index 785a920eaf74..106141eb3e32 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
@@ -18,6 +18,9 @@ struct nvkm_outp {
 	struct nvkm_conn *conn;
 
 	/* Assembly state. */
+#define NVKM_OUTP_PRIV 1
+#define NVKM_OUTP_USER 2
+	u8 acquired:2;
 	struct nvkm_ior *ior;
 };
 
@@ -28,6 +31,9 @@ int nvkm_outp_new(struct nvkm_disp *, int index, struct dcb_output *,
 void nvkm_outp_del(struct nvkm_outp **);
 void nvkm_outp_init(struct nvkm_outp *);
 void nvkm_outp_fini(struct nvkm_outp *);
+int nvkm_outp_acquire(struct nvkm_outp *, u8 user);
+void nvkm_outp_release(struct nvkm_outp *, u8 user);
+void nvkm_outp_route(struct nvkm_disp *);
 
 struct nvkm_outp_func {
 	void *(*dtor)(struct nvkm_outp *);
@@ -39,8 +45,6 @@ struct nvkm_outp_func {
 #define nvkm_output_func nvkm_outp_func
 #define nvkm_output_new_ nvkm_outp_new_
 
-void gm200_sor_magic(struct nvkm_output *outp);
-
 #define OUTP_MSG(o,l,f,a...) do {                                              \
 	struct nvkm_outp *_outp = (o);                                         \
 	nvkm_##l(&_outp->disp->engine.subdev, "outp %02x:%04x:%04x: "f"\n",    \
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c
index f3ebdd032b9b..4c7b7090b1a0 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/rootnv50.c
@@ -94,6 +94,24 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 	}
 
 	switch (mthd * !!outp) {
+	case NV50_DISP_MTHD_V1_ACQUIRE: {
+		union {
+			struct nv50_disp_acquire_v0 v0;
+		} *args = data;
+		int ret = -ENOSYS;
+		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
+			ret = nvkm_outp_acquire(outp, NVKM_OUTP_USER);
+			if (ret == 0) {
+				args->v0.or = outp->ior->id;
+				args->v0.link = outp->ior->asy.link;
+			}
+		}
+		return ret;
+	}
+		break;
+	case NV50_DISP_MTHD_V1_RELEASE:
+		nvkm_outp_release(outp, NVKM_OUTP_USER);
+		return 0;
 	case NV50_DISP_MTHD_V1_DAC_LOAD: {
 		union {
 			struct nv50_disp_dac_load_v0 v0;
@@ -102,7 +120,11 @@ nv50_disp_root_mthd_(struct nvkm_object *object, u32 mthd, void *data, u32 size)
 		if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
 			if (args->v0.data & 0xfff00000)
 				return -EINVAL;
+			ret = nvkm_outp_acquire(outp, NVKM_OUTP_PRIV);
+			if (ret)
+				return ret;
 			ret = outp->ior->func->sense(outp->ior, args->v0.data);
+			nvkm_outp_release(outp, NVKM_OUTP_PRIV);
 			if (ret < 0)
 				return ret;
 			args->v0.load = ret;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/sorgm200.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/sorgm200.c
index 0ba7d03efa78..25528a15516b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/sorgm200.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/sorgm200.c
@@ -45,20 +45,55 @@ gm200_sor_dp_drive(struct nvkm_ior *sor, int ln, int pc, int dc, int pe, int pu)
 	nvkm_wr32(device, 0x61c13c + loff, data[3] | (pc << shift));
 }
 
-void
-gm200_sor_magic(struct nvkm_output *outp)
+static void
+gm200_sor_route_set(struct nvkm_outp *outp, struct nvkm_ior *ior)
 {
 	struct nvkm_device *device = outp->disp->engine.subdev.device;
-	const u32 soff = outp->or * 0x100;
-	const u32 data = outp->or + 1;
-	if (outp->info.sorconf.link & 1)
-		nvkm_mask(device, 0x612308 + soff, 0x0000001f, 0x00000000 | data);
+	const u32 moff = __ffs(outp->info.or) * 0x100;
+	const u32  sor = ior ? ior->id + 1 : 0;
+	u32 link = ior ? (ior->asy.link == 2) : 0;
+
+	if (outp->info.sorconf.link & 1) {
+		nvkm_mask(device, 0x612308 + moff, 0x0000001f, link << 4 | sor);
+		link++;
+	}
+
 	if (outp->info.sorconf.link & 2)
-		nvkm_mask(device, 0x612388 + soff, 0x0000001f, 0x00000010 | data);
+		nvkm_mask(device, 0x612388 + moff, 0x0000001f, link << 4 | sor);
+}
+
+static int
+gm200_sor_route_get(struct nvkm_outp *outp, int *link)
+{
+	struct nvkm_device *device = outp->disp->engine.subdev.device;
+	const int sublinks = outp->info.sorconf.link;
+	int lnk[2], sor[2], m, s;
+
+	for (*link = 0, m = __ffs(outp->info.or) * 2, s = 0; s < 2; m++, s++) {
+		if (sublinks & BIT(s)) {
+			u32 data = nvkm_rd32(device, 0x612308 + (m * 0x80));
+			lnk[s] = (data & 0x00000010) >> 4;
+			sor[s] = (data & 0x0000000f);
+			if (!sor[s])
+				return -1;
+			*link |= lnk[s];
+		}
+	}
+
+	if (sublinks == 3) {
+		if (sor[0] != sor[1] || WARN_ON(lnk[0] || !lnk[1]))
+			return -1;
+	}
+
+	return ((sublinks & 1) ? sor[0] : sor[1]) - 1;
 }
 
 static const struct nvkm_ior_func
 gm200_sor = {
+	.route = {
+		.get = gm200_sor_route_get,
+		.set = gm200_sor_route_set,
+	},
 	.state = gf119_sor_state,
 	.power = nv50_sor_power,
 	.hdmi = {