From 34e9b8247634bd8624d47a13ca2e9c37839fedd6 Mon Sep 17 00:00:00 2001
From: "Sergey Semyonov (Serge)" <ion2@mail.ru>
Date: Fri, 11 Mar 2016 09:57:26 +0000
Subject: [PATCH] i915-4.4.5

git-svn-id: svn://kolibrios.org@6320 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 drivers/video/drm/drm_dp_mst_topology.c      | 313 +++++++----
 drivers/video/drm/drm_irq.c                  |  83 ++-
 drivers/video/drm/drm_stub.c                 |  42 ++
 drivers/video/drm/i915/Makefile              |   3 +-
 drivers/video/drm/i915/Makefile.lto          |  21 +-
 drivers/video/drm/i915/i915_dma.c            |   2 +
 drivers/video/drm/i915/i915_drv.c            |   7 +-
 drivers/video/drm/i915/i915_drv.h            |   2 +-
 drivers/video/drm/i915/i915_gem_context.c    |   6 +-
 drivers/video/drm/i915/i915_guc_submission.c |   1 -
 drivers/video/drm/i915/i915_irq.c            |  47 +-
 drivers/video/drm/i915/i915_trace.h          |   3 +
 drivers/video/drm/i915/intel_ddi.c           |   3 +-
 drivers/video/drm/i915/intel_display.c       |  81 ++-
 drivers/video/drm/i915/intel_dp.c            |  11 +-
 drivers/video/drm/i915/intel_drv.h           |   2 +-
 drivers/video/drm/i915/intel_dsi_panel_vbt.c |   8 +-
 drivers/video/drm/i915/intel_hotplug.c       | 513 +++++++++++++++++++
 drivers/video/drm/i915/intel_i2c.c           |   2 +-
 drivers/video/drm/i915/intel_lrc.c           |   2 +
 drivers/video/drm/i915/intel_ringbuffer.c    |   2 +
 drivers/video/drm/i915/kms_display.c         | 148 +-----
 drivers/video/drm/i915/kos_fb.c              | 174 +++++++
 drivers/video/drm/i915/main.c                |   6 +-
 24 files changed, 1178 insertions(+), 304 deletions(-)
 create mode 100644 drivers/video/drm/i915/intel_hotplug.c
 create mode 100644 drivers/video/drm/i915/kos_fb.c

diff --git a/drivers/video/drm/drm_dp_mst_topology.c b/drivers/video/drm/drm_dp_mst_topology.c
index 8cbd03e59b..6738e1a429 100644
--- a/drivers/video/drm/drm_dp_mst_topology.c
+++ b/drivers/video/drm/drm_dp_mst_topology.c
@@ -806,12 +806,33 @@ static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
 	return mstb;
 }
 
+static void drm_dp_free_mst_port(struct kref *kref);
+
+static void drm_dp_free_mst_branch_device(struct kref *kref)
+{
+	struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
+	if (mstb->port_parent) {
+		if (list_empty(&mstb->port_parent->next))
+			kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port);
+	}
+	kfree(mstb);
+}
+
 static void drm_dp_destroy_mst_branch_device(struct kref *kref)
 {
 	struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref);
 	struct drm_dp_mst_port *port, *tmp;
 	bool wake_tx = false;
 
+	/*
+	 * init kref again to be used by ports to remove mst branch when it is
+	 * not needed anymore
+	 */
+	kref_init(kref);
+
+	if (mstb->port_parent && list_empty(&mstb->port_parent->next))
+		kref_get(&mstb->port_parent->kref);
+
 	/*
 	 * destroy all ports - don't need lock
 	 * as there are no more references to the mst branch
@@ -838,7 +859,7 @@ static void drm_dp_destroy_mst_branch_device(struct kref *kref)
 
 //   if (wake_tx)
 //       wake_up(&mstb->mgr->tx_waitq);
-	kfree(mstb);
+	kref_put(kref, drm_dp_free_mst_branch_device);
 }
 
 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb)
@@ -886,6 +907,7 @@ static void drm_dp_destroy_port(struct kref *kref)
 			 * from an EDID retrieval */
 
 			mutex_lock(&mgr->destroy_connector_lock);
+			kref_get(&port->parent->kref);
 			list_add(&port->next, &mgr->destroy_connector_list);
 			mutex_unlock(&mgr->destroy_connector_lock);
 //		schedule_work(&mgr->destroy_connector_work);
@@ -981,17 +1003,17 @@ static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u
 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
 				 u8 *rad)
 {
-	int lct = port->parent->lct;
+	int parent_lct = port->parent->lct;
 	int shift = 4;
-	int idx = lct / 2;
-	if (lct > 1) {
-		memcpy(rad, port->parent->rad, idx);
-		shift = (lct % 2) ? 4 : 0;
+	int idx = (parent_lct - 1) / 2;
+	if (parent_lct > 1) {
+		memcpy(rad, port->parent->rad, idx + 1);
+		shift = (parent_lct % 2) ? 4 : 0;
 	} else
 		rad[0] = 0;
 
 	rad[idx] |= port->port_num << shift;
-	return lct + 1;
+	return parent_lct + 1;
 }
 
 /*
@@ -1021,18 +1043,27 @@ static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
 	return send_link;
 }
 
-static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb,
-				   struct drm_dp_mst_port *port)
+static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
 {
 	int ret;
-	if (port->dpcd_rev >= 0x12) {
-		port->guid_valid = drm_dp_validate_guid(mstb->mgr, port->guid);
-		if (!port->guid_valid) {
-			ret = drm_dp_send_dpcd_write(mstb->mgr,
-						     port,
+
+	memcpy(mstb->guid, guid, 16);
+
+	if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
+		if (mstb->port_parent) {
+			ret = drm_dp_send_dpcd_write(
+					mstb->mgr,
+					mstb->port_parent,
+					DP_GUID,
+					16,
+					mstb->guid);
+		} else {
+
+			ret = drm_dp_dpcd_write(
+					mstb->mgr->aux,
 						     DP_GUID,
-						     16, port->guid);
-			port->guid_valid = true;
+					mstb->guid,
+					16);
 		}
 	}
 }
@@ -1047,7 +1078,7 @@ static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
 	snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
 	for (i = 0; i < (mstb->lct - 1); i++) {
 		int shift = (i % 2) ? 0 : 4;
-		int port_num = mstb->rad[i / 2] >> shift;
+		int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
 		snprintf(temp, sizeof(temp), "-%d", port_num);
 		strlcat(proppath, temp, proppath_size);
 	}
@@ -1089,7 +1120,6 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
 	port->dpcd_rev = port_msg->dpcd_revision;
 	port->num_sdp_streams = port_msg->num_sdp_streams;
 	port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
-	memcpy(port->guid, port_msg->peer_guid, 16);
 
 	/* manage mstb port lists with mgr lock - take a reference
 	   for this list */
@@ -1102,11 +1132,9 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
 
 	if (old_ddps != port->ddps) {
 		if (port->ddps) {
-			drm_dp_check_port_guid(mstb, port);
 			if (!port->input)
 				drm_dp_send_enum_path_resources(mstb->mgr, mstb, port);
 		} else {
-			port->guid_valid = false;
 			port->available_pbn = 0;
 			}
 	}
@@ -1165,10 +1193,8 @@ static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
 
 	if (old_ddps != port->ddps) {
 		if (port->ddps) {
-			drm_dp_check_port_guid(mstb, port);
 			dowork = true;
 		} else {
-			port->guid_valid = false;
 			port->available_pbn = 0;
 		}
 	}
@@ -1198,7 +1224,7 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_
 
 	for (i = 0; i < lct - 1; i++) {
 		int shift = (i % 2) ? 0 : 4;
-		int port_num = rad[i / 2] >> shift;
+		int port_num = (rad[i / 2] >> shift) & 0xf;
 
 		list_for_each_entry(port, &mstb->ports, next) {
 			if (port->port_num == port_num) {
@@ -1218,6 +1244,48 @@ out:
 	return mstb;
 }
 
+static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
+	struct drm_dp_mst_branch *mstb,
+	uint8_t *guid)
+{
+	struct drm_dp_mst_branch *found_mstb;
+	struct drm_dp_mst_port *port;
+
+	if (memcmp(mstb->guid, guid, 16) == 0)
+		return mstb;
+
+
+	list_for_each_entry(port, &mstb->ports, next) {
+		if (!port->mstb)
+			continue;
+
+		found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
+
+		if (found_mstb)
+			return found_mstb;
+	}
+
+	return NULL;
+}
+
+static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
+	struct drm_dp_mst_topology_mgr *mgr,
+	uint8_t *guid)
+{
+	struct drm_dp_mst_branch *mstb;
+
+	/* find the port by iterating down */
+	mutex_lock(&mgr->lock);
+
+	mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
+
+	if (mstb)
+		kref_get(&mstb->kref);
+
+	mutex_unlock(&mgr->lock);
+	return mstb;
+}
+
 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
 					       struct drm_dp_mst_branch *mstb)
 {
@@ -1328,6 +1396,7 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
 				  struct drm_dp_sideband_msg_tx *txmsg)
 {
 	struct drm_dp_mst_branch *mstb = txmsg->dst;
+	u8 req_type;
 
 	/* both msg slots are full */
 	if (txmsg->seqno == -1) {
@@ -1344,6 +1413,12 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
 			txmsg->seqno = 1;
 		mstb->tx_slots[txmsg->seqno] = txmsg;
 	}
+
+	req_type = txmsg->msg[0] & 0x7f;
+	if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
+		req_type == DP_RESOURCE_STATUS_NOTIFY)
+		hdr->broadcast = 1;
+	else
 	hdr->broadcast = 0;
 	hdr->path_msg = txmsg->path_msg;
 	hdr->lct = mstb->lct;
@@ -1446,26 +1521,18 @@ static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
 }
 
 /* called holding qlock */
-static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
+static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
+				       struct drm_dp_sideband_msg_tx *txmsg)
 {
-	struct drm_dp_sideband_msg_tx *txmsg;
 	int ret;
 
 	/* construct a chunk from the first msg in the tx_msg queue */
-	if (list_empty(&mgr->tx_msg_upq)) {
-		mgr->tx_up_in_progress = false;
-		return;
-	}
-
-	txmsg = list_first_entry(&mgr->tx_msg_upq, struct drm_dp_sideband_msg_tx, next);
 	ret = process_single_tx_qlock(mgr, txmsg, true);
-	if (ret == 1) {
-		/* up txmsgs aren't put in slots - so free after we send it */
-		list_del(&txmsg->next);
-		kfree(txmsg);
-	} else if (ret)
+
+	if (ret != 1)
 		DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
-	mgr->tx_up_in_progress = true;
+
+	txmsg->dst->tx_slots[txmsg->seqno] = NULL;
 }
 
 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
@@ -1515,6 +1582,9 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
 				       txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
 				       txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
 			}
+
+			drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
+
 			for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
 				drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
 			}
@@ -1562,6 +1632,37 @@ static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
 	return 0;
 }
 
+static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
+{
+	if (!mstb->port_parent)
+		return NULL;
+
+	if (mstb->port_parent->mstb != mstb)
+		return mstb->port_parent;
+
+	return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
+}
+
+static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
+									 struct drm_dp_mst_branch *mstb,
+									 int *port_num)
+{
+	struct drm_dp_mst_branch *rmstb = NULL;
+	struct drm_dp_mst_port *found_port;
+	mutex_lock(&mgr->lock);
+	if (mgr->mst_primary) {
+		found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
+
+		if (found_port) {
+			rmstb = found_port->parent;
+			kref_get(&rmstb->kref);
+			*port_num = found_port->port_num;
+		}
+	}
+	mutex_unlock(&mgr->lock);
+	return rmstb;
+}
+
 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
 				   struct drm_dp_mst_port *port,
 				   int id,
@@ -1569,11 +1670,16 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
 {
 	struct drm_dp_sideband_msg_tx *txmsg;
 	struct drm_dp_mst_branch *mstb;
-	int len, ret;
+	int len, ret, port_num;
 
+	port_num = port->port_num;
 	mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent);
+	if (!mstb) {
+		mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num);
+
 	if (!mstb)
 		return -EINVAL;
+	}
 
 	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
 	if (!txmsg) {
@@ -1582,7 +1688,7 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
 	}
 
 	txmsg->dst = mstb;
-	len = build_allocate_payload(txmsg, port->port_num,
+	len = build_allocate_payload(txmsg, port_num,
 				     id,
 				     pbn);
 
@@ -1852,11 +1958,12 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
 	drm_dp_encode_up_ack_reply(txmsg, req_type);
 
 	mutex_lock(&mgr->qlock);
-	list_add_tail(&txmsg->next, &mgr->tx_msg_upq);
-	if (!mgr->tx_up_in_progress) {
-		process_single_up_tx_qlock(mgr);
-	}
+
+	process_single_up_tx_qlock(mgr, txmsg);
+
 	mutex_unlock(&mgr->qlock);
+
+	kfree(txmsg);
 	return 0;
 }
 
@@ -1935,31 +2042,17 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
 		mgr->mst_primary = mstb;
 		kref_get(&mgr->mst_primary->kref);
 
-		{
-			struct drm_dp_payload reset_pay;
-			reset_pay.start_slot = 0;
-			reset_pay.num_slots = 0x3f;
-			drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
-		}
-
 		ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
 					 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
 		if (ret < 0) {
 			goto out_unlock;
 		}
 
-
-		/* sort out guid */
-		ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, mgr->guid, 16);
-		if (ret != 16) {
-			DRM_DEBUG_KMS("failed to read DP GUID %d\n", ret);
-			goto out_unlock;
-		}
-
-		mgr->guid_valid = drm_dp_validate_guid(mgr, mgr->guid);
-		if (!mgr->guid_valid) {
-			ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, mgr->guid, 16);
-			mgr->guid_valid = true;
+		{
+			struct drm_dp_payload reset_pay;
+			reset_pay.start_slot = 0;
+			reset_pay.num_slots = 0x3f;
+			drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
 		}
 
 //       queue_work(system_long_wq, &mgr->work);
@@ -2151,8 +2244,10 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
 
 	if (mgr->up_req_recv.have_eomt) {
 		struct drm_dp_sideband_msg_req_body msg;
-		struct drm_dp_mst_branch *mstb;
+		struct drm_dp_mst_branch *mstb = NULL;
 		bool seqno;
+
+		if (!mgr->up_req_recv.initial_hdr.broadcast) {
 		mstb = drm_dp_get_mst_branch_device(mgr,
 						    mgr->up_req_recv.initial_hdr.lct,
 						    mgr->up_req_recv.initial_hdr.rad);
@@ -2161,18 +2256,39 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
 			memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
 			return 0;
 		}
+		}
 
 		seqno = mgr->up_req_recv.initial_hdr.seqno;
 		drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
 
 		if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
-			drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false);
+			drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
+
+			if (!mstb)
+				mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
+
+			if (!mstb) {
+				DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
+				memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
+				return 0;
+			}
+
 			drm_dp_update_port(mstb, &msg.u.conn_stat);
+
 			DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type);
 			(*mgr->cbs->hotplug)(mgr);
 
 		} else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
-			drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false);
+			drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
+			if (!mstb)
+				mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
+
+			if (!mstb) {
+				DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
+				memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
+				return 0;
+			}
+
 			DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
 		}
 
@@ -2352,6 +2468,7 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp
 		DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
 		if (pbn == port->vcpi.pbn) {
 			*slots = port->vcpi.num_slots;
+			drm_dp_put_port(port);
 			return true;
 		}
 	}
@@ -2511,32 +2628,31 @@ EXPORT_SYMBOL(drm_dp_check_act_status);
  */
 int drm_dp_calc_pbn_mode(int clock, int bpp)
 {
-	fixed20_12 pix_bw;
-	fixed20_12 fbpp;
-	fixed20_12 result;
-	fixed20_12 margin, tmp;
-	u32 res;
+	u64 kbps;
+	s64 peak_kbps;
+	u32 numerator;
+	u32 denominator;
 
-	pix_bw.full = dfixed_const(clock);
-	fbpp.full = dfixed_const(bpp);
-	tmp.full = dfixed_const(8);
-	fbpp.full = dfixed_div(fbpp, tmp);
+	kbps = clock * bpp;
 
-	result.full = dfixed_mul(pix_bw, fbpp);
-	margin.full = dfixed_const(54);
-	tmp.full = dfixed_const(64);
-	margin.full = dfixed_div(margin, tmp);
-	result.full = dfixed_div(result, margin);
+	/*
+	 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
+	 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
+	 * common multiplier to render an integer PBN for all link rate/lane
+	 * counts combinations
+	 * calculate
+	 * peak_kbps *= (1006/1000)
+	 * peak_kbps *= (64/54)
+	 * peak_kbps *= 8    convert to bytes
+	 */
 
-	margin.full = dfixed_const(1006);
-	tmp.full = dfixed_const(1000);
-	margin.full = dfixed_div(margin, tmp);
-	result.full = dfixed_mul(result, margin);
+	numerator = 64 * 1006;
+	denominator = 54 * 8 * 1000 * 1000;
 
-	result.full = dfixed_div(result, tmp);
-	result.full = dfixed_ceil(result);
-	res = dfixed_trunc(result);
-	return res;
+	kbps *= numerator;
+	peak_kbps = drm_fixp_from_fraction(kbps, denominator);
+
+	return drm_fixp2int_ceil(peak_kbps);
 }
 EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
 
@@ -2544,11 +2660,23 @@ static int test_calc_pbn_mode(void)
 {
 	int ret;
 	ret = drm_dp_calc_pbn_mode(154000, 30);
-	if (ret != 689)
+	if (ret != 689) {
+		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+				154000, 30, 689, ret);
 		return -EINVAL;
+	}
 	ret = drm_dp_calc_pbn_mode(234000, 30);
-	if (ret != 1047)
+	if (ret != 1047) {
+		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+				234000, 30, 1047, ret);
 		return -EINVAL;
+	}
+	ret = drm_dp_calc_pbn_mode(297000, 24);
+	if (ret != 1063) {
+		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
+				297000, 24, 1063, ret);
+		return -EINVAL;
+	}
 	return 0;
 }
 
@@ -2627,6 +2755,12 @@ static void drm_dp_tx_work(struct work_struct *work)
 	mutex_unlock(&mgr->qlock);
 }
 
+static void drm_dp_free_mst_port(struct kref *kref)
+{
+	struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref);
+	kref_put(&port->parent->kref, drm_dp_free_mst_branch_device);
+	kfree(port);
+}
 /**
  * drm_dp_mst_topology_mgr_init - initialise a topology manager
  * @mgr: manager struct to initialise
@@ -2647,7 +2781,6 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
 	mutex_init(&mgr->qlock);
 	mutex_init(&mgr->payload_lock);
 	mutex_init(&mgr->destroy_connector_lock);
-	INIT_LIST_HEAD(&mgr->tx_msg_upq);
 	INIT_LIST_HEAD(&mgr->tx_msg_downq);
 	INIT_LIST_HEAD(&mgr->destroy_connector_list);
 	INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
diff --git a/drivers/video/drm/drm_irq.c b/drivers/video/drm/drm_irq.c
index 136ffd8145..2a004141ee 100644
--- a/drivers/video/drm/drm_irq.c
+++ b/drivers/video/drm/drm_irq.c
@@ -238,6 +238,64 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 		diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
 	}
 
+	/*
+	 * Within a drm_vblank_pre_modeset - drm_vblank_post_modeset
+	 * interval? If so then vblank irqs keep running and it will likely
+	 * happen that the hardware vblank counter is not trustworthy as it
+	 * might reset at some point in that interval and vblank timestamps
+	 * are not trustworthy either in that interval. Iow. this can result
+	 * in a bogus diff >> 1 which must be avoided as it would cause
+	 * random large forward jumps of the software vblank counter.
+	 */
+	if (diff > 1 && (vblank->inmodeset & 0x2)) {
+		DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u"
+			      " due to pre-modeset.\n", pipe, diff);
+		diff = 1;
+	}
+
+	/*
+	 * FIMXE: Need to replace this hack with proper seqlocks.
+	 *
+	 * Restrict the bump of the software vblank counter to a safe maximum
+	 * value of +1 whenever there is the possibility that concurrent readers
+	 * of vblank timestamps could be active at the moment, as the current
+	 * implementation of the timestamp caching and updating is not safe
+	 * against concurrent readers for calls to store_vblank() with a bump
+	 * of anything but +1. A bump != 1 would very likely return corrupted
+	 * timestamps to userspace, because the same slot in the cache could
+	 * be concurrently written by store_vblank() and read by one of those
+	 * readers without the read-retry logic detecting the collision.
+	 *
+	 * Concurrent readers can exist when we are called from the
+	 * drm_vblank_off() or drm_vblank_on() functions and other non-vblank-
+	 * irq callers. However, all those calls to us are happening with the
+	 * vbl_lock locked to prevent drm_vblank_get(), so the vblank refcount
+	 * can't increase while we are executing. Therefore a zero refcount at
+	 * this point is safe for arbitrary counter bumps if we are called
+	 * outside vblank irq, a non-zero count is not 100% safe. Unfortunately
+	 * we must also accept a refcount of 1, as whenever we are called from
+	 * drm_vblank_get() -> drm_vblank_enable() the refcount will be 1 and
+	 * we must let that one pass through in order to not lose vblank counts
+	 * during vblank irq off - which would completely defeat the whole
+	 * point of this routine.
+	 *
+	 * Whenever we are called from vblank irq, we have to assume concurrent
+	 * readers exist or can show up any time during our execution, even if
+	 * the refcount is currently zero, as vblank irqs are usually only
+	 * enabled due to the presence of readers, and because when we are called
+	 * from vblank irq we can't hold the vbl_lock to protect us from sudden
+	 * bumps in vblank refcount. Therefore also restrict bumps to +1 when
+	 * called from vblank irq.
+	 */
+	if ((diff > 1) && (atomic_read(&vblank->refcount) > 1 ||
+	    (flags & DRM_CALLED_FROM_VBLIRQ))) {
+		DRM_DEBUG_VBL("clamping vblank bump to 1 on crtc %u: diffr=%u "
+			      "refcount %u, vblirq %u\n", pipe, diff,
+			      atomic_read(&vblank->refcount),
+			      (flags & DRM_CALLED_FROM_VBLIRQ) != 0);
+		diff = 1;
+	}
+
 	DRM_DEBUG_VBL("updating vblank count on crtc %u:"
 		      " current=%u, diff=%u, hw=%u hw_last=%u\n",
 		      pipe, vblank->count, diff, cur_vblank, vblank->last);
@@ -1178,6 +1236,8 @@ void drm_vblank_off(struct drm_device *dev, unsigned int pipe)
 	spin_lock_irqsave(&dev->event_lock, irqflags);
 
 	spin_lock(&dev->vbl_lock);
+	DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
+		      pipe, vblank->enabled, vblank->inmodeset);
 	vblank_disable_and_save(dev, pipe);
 	wake_up(&vblank->queue);
 
@@ -1280,6 +1340,9 @@ void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
 		return;
 
 	spin_lock_irqsave(&dev->vbl_lock, irqflags);
+	DRM_DEBUG_VBL("crtc %d, vblank enabled %d, inmodeset %d\n",
+		      pipe, vblank->enabled, vblank->inmodeset);
+
 	/* Drop our private "prevent drm_vblank_get" refcount */
 	if (vblank->inmodeset) {
 		atomic_dec(&vblank->refcount);
@@ -1292,8 +1355,7 @@ void drm_vblank_on(struct drm_device *dev, unsigned int pipe)
 	 * re-enable interrupts if there are users left, or the
 	 * user wishes vblank interrupts to be enabled all the time.
 	 */
-	if (atomic_read(&vblank->refcount) != 0 ||
-	    (!dev->vblank_disable_immediate && drm_vblank_offdelay == 0))
+	if (atomic_read(&vblank->refcount) != 0 || drm_vblank_offdelay == 0)
 		WARN_ON(drm_vblank_enable(dev, pipe));
 	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 }
@@ -1388,6 +1450,7 @@ void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe)
 	if (vblank->inmodeset) {
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
 		dev->vblank_disable_allowed = true;
+		drm_reset_vblank_timestamp(dev, pipe);
 		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 
 		if (vblank->inmodeset & 0x2)
@@ -1507,19 +1570,3 @@ u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
 	return 0;
 }
 EXPORT_SYMBOL(drm_vblank_no_hw_counter);
-
-u64 div64_u64(u64 dividend, u64 divisor)
-{
-        u32 high, d;
-
-        high = divisor >> 32;
-        if (high) {
-                unsigned int shift = fls(high);
-
-                d = divisor >> shift;
-                dividend >>= shift;
-        } else
-                d = divisor;
-
-        return div_u64(dividend, d);
-}
diff --git a/drivers/video/drm/drm_stub.c b/drivers/video/drm/drm_stub.c
index 8cd5d4698a..75390d5607 100644
--- a/drivers/video/drm/drm_stub.c
+++ b/drivers/video/drm/drm_stub.c
@@ -560,3 +560,45 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
     DRM_DEBUG("generating hotplug event\n");
 }
 
+u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
+{
+    u32 high = divisor >> 32;
+    u64 quot;
+
+    if (high == 0) {
+        u32 rem32;
+        quot = div_u64_rem(dividend, divisor, &rem32);
+        *remainder = rem32;
+    } else {
+        int n = 1 + fls(high);
+        quot = div_u64(dividend >> n, divisor >> n);
+
+        if (quot != 0)
+            quot--;
+
+        *remainder = dividend - quot * divisor;
+        if (*remainder >= divisor) {
+            quot++;
+            *remainder -= divisor;
+        }
+    }
+
+    return quot;
+}
+
+u64 div64_u64(u64 dividend, u64 divisor)
+{
+        u32 high, d;
+
+        high = divisor >> 32;
+        if (high) {
+                unsigned int shift = fls(high);
+
+                d = divisor >> shift;
+                dividend >>= shift;
+        } else
+                d = divisor;
+
+        return div_u64(dividend, d);
+}
+
diff --git a/drivers/video/drm/i915/Makefile b/drivers/video/drm/i915/Makefile
index bccec1e4cd..c1ec7c09e6 100644
--- a/drivers/video/drm/i915/Makefile
+++ b/drivers/video/drm/i915/Makefile
@@ -113,6 +113,7 @@ NAME_SRC=		main.c					\
 			intel_uncore.c				\
 			kms_display.c				\
 			kos_cursor.c				\
+			kos_fb.c				\
 			utils.c					\
 			fwblob.asm				\
 			../hdmi.c				\
@@ -153,7 +154,7 @@ NAME_OBJS = $(patsubst %.S, %.o, $(patsubst %.asm, %.o,\
             $(patsubst %.c, %.o, $(NAME_SRC))))
 
 
-all: $(NAME).dll 
+all: $(NAME).dll
 
 $(NAME).dll: $(NAME_OBJS) $(FW_BINS) $(SRC_DEP) i915.lds Makefile
 	ld -L$(LIBPATH) $(LDFLAGS) -T i915.lds -o $@ $(NAME_OBJS) $(LIBS)  
diff --git a/drivers/video/drm/i915/Makefile.lto b/drivers/video/drm/i915/Makefile.lto
index 2f5a9f1082..fe20587db7 100644
--- a/drivers/video/drm/i915/Makefile.lto
+++ b/drivers/video/drm/i915/Makefile.lto
@@ -2,10 +2,10 @@
 CC = kos32-gcc
 FASM = fasm.exe
 
-DEFINES	 = -DDRM_DEBUG_CODE=1 -D__KERNEL__ -DCONFIG_X86_32 -DCONFIG_X86_CMPXCHG64 -DCONFIG_TINY_RCU
-DEFINES  += -DCONFIG_X86_L1_CACHE_SHIFT=6
-DEFINES += -DCONFIG_DRM_FBDEV_EMULATION -DCONFIG_DMI -DKBUILD_MODNAME=\"i915.dll\"
-
+DEFINES	= -DDRM_DEBUG_CODE=0 -D__KERNEL__ -DCONFIG_X86 -DCONFIG_X86_32 -DCONFIG_PCI
+DEFINES += -DCONFIG_X86_CMPXCHG64 -DCONFIG_TINY_RCU -DCONFIG_X86_L1_CACHE_SHIFT=6
+DEFINES += -DCONFIG_DRM_FBDEV_EMULATION -DCONFIG_DMI 
+DEFINES += -DKBUILD_MODNAME=\"i915.dll\"
 
 DDK_TOPDIR      = /d/kos/kolibri/drivers/ddk
 DRV_INCLUDES    = /d/kos/kolibri/drivers/include
@@ -16,7 +16,7 @@ INCLUDES =	-I$(DRV_INCLUDES)	\
 		-I$(DRV_INCLUDES)/uapi	\
 		-I$(DRV_INCLUDES)/drm -I./ -I$(DRV_INCLUDES)
 
-CFLAGS_OPT = -Os -march=i686 -msse2 -fomit-frame-pointer -fno-builtin-printf -fno-ident -mno-stack-arg-probe
+CFLAGS_OPT = -O2 -march=i686 -msse2 -fomit-frame-pointer -fno-builtin-printf -fno-ident -mno-stack-arg-probe
 CFLAGS_OPT+= -mpreferred-stack-boundary=2 -mincoming-stack-boundary=2 -mno-ms-bitfields -flto
 CFLAGS   = -c $(INCLUDES) $(DEFINES) $(CFLAGS_OPT)
 
@@ -45,6 +45,8 @@ HFILES:=     		$(DRV_INCLUDES)/linux/types.h		\
 
 NAME_SRC=		main.c					\
 			pci.c					\
+			getopt.c				\
+			getopt1.c				\
 			dvo_ch7017.c				\
 			dvo_ch7xxx.c				\
 			dvo_ivch.c				\
@@ -90,6 +92,7 @@ NAME_SRC=		main.c					\
 			intel_frontbuffer.c			\
 			intel_guc_loader.c			\
 			intel_hdmi.c				\
+			intel_hotplug.c				\
 			intel_i2c.c				\
 			intel_lrc.c				\
 			intel_lvds.c				\
@@ -109,6 +112,8 @@ NAME_SRC=		main.c					\
 			intel_sprite.c				\
 			intel_uncore.c				\
 			kms_display.c				\
+			kos_cursor.c				\
+			kos_fb.c				\
 			utils.c					\
 			fwblob.asm				\
 			../hdmi.c				\
@@ -123,7 +128,7 @@ NAME_SRC=		main.c					\
 			$(DRM_TOPDIR)/drm_crtc.c		\
 			$(DRM_TOPDIR)/drm_crtc_helper.c		\
 			$(DRM_TOPDIR)/drm_dp_helper.c		\
-			../drm_dp_mst_topology.c		\
+			$(DRM_TOPDIR)/drm_dp_mst_topology.c	\
 			$(DRM_TOPDIR)/drm_atomic.c		\
 			$(DRM_TOPDIR)/drm_atomic_helper.c	\
 			$(DRM_TOPDIR)/drm_bridge.c		\
@@ -149,7 +154,6 @@ NAME_OBJS = $(patsubst %.S, %.o, $(patsubst %.asm, %.o,\
             $(patsubst %.c, %.o, $(NAME_SRC))))
 
 
-
 all: $(NAME).dll
 
 $(NAME).dll: $(NAME_OBJS) $(FW_BINS) $(SRC_DEP) i915.lds Makefile.lto
@@ -162,6 +166,9 @@ $(NAME).dll: $(NAME_OBJS) $(FW_BINS) $(SRC_DEP) i915.lds Makefile.lto
 %.o : %.S $(HFILES) Makefile.lto
 	as -o $@ $<
 
+fwblob.o:  fwblob.asm $(FW_BINS) Makefile
+	$(FASM) $< $@
+
 
 clean:
 	-rm -f ../*/*.o
diff --git a/drivers/video/drm/i915/i915_dma.c b/drivers/video/drm/i915/i915_dma.c
index 3fb795b0f8..bda4170922 100644
--- a/drivers/video/drm/i915/i915_dma.c
+++ b/drivers/video/drm/i915/i915_dma.c
@@ -840,6 +840,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto put_bridge;
 	}
 
+	set_fake_framebuffer();
+
 	/* This must be called before any calls to HAS_PCH_* */
 	intel_detect_pch(dev);
 
diff --git a/drivers/video/drm/i915/i915_drv.c b/drivers/video/drm/i915/i915_drv.c
index 2558dd4e5f..c8d9f72a73 100644
--- a/drivers/video/drm/i915/i915_drv.c
+++ b/drivers/video/drm/i915/i915_drv.c
@@ -38,7 +38,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/mod_devicetable.h>
 #include <linux/pci.h>
-#include <drm/i915_pciids.h> 
+#include <drm/i915_pciids.h>
 
 #include <drm/drm_crtc_helper.h>
 
@@ -508,7 +508,10 @@ void intel_detect_pch(struct drm_device *dev)
 				dev_priv->pch_type = PCH_SPT;
 				DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev));
-			} else if (id == INTEL_PCH_P2X_DEVICE_ID_TYPE) {
+			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
+				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
+				    pch->subsystem_vendor == 0x1af4 &&
+				    pch->subsystem_device == 0x1100)) {
 				dev_priv->pch_type = intel_virt_detect_pch(dev);
 			} else
 				continue;
diff --git a/drivers/video/drm/i915/i915_drv.h b/drivers/video/drm/i915/i915_drv.h
index 41c65affac..4e3e82fdb5 100644
--- a/drivers/video/drm/i915/i915_drv.h
+++ b/drivers/video/drm/i915/i915_drv.h
@@ -51,7 +51,6 @@
 #include "intel_guc.h"
 
 #include <linux/spinlock.h>
-#include <linux/err.h>
 
 #define ioread32(addr)          readl(addr)
 static inline u8 inb(u16 port)
@@ -2623,6 +2622,7 @@ struct drm_i915_cmd_table {
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
+#define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev) (__I915__(dev)->pch_type)
 #define HAS_PCH_SPT(dev) (INTEL_PCH_TYPE(dev) == PCH_SPT)
diff --git a/drivers/video/drm/i915/i915_gem_context.c b/drivers/video/drm/i915/i915_gem_context.c
index ad0e103388..4d8ab27ba4 100644
--- a/drivers/video/drm/i915/i915_gem_context.c
+++ b/drivers/video/drm/i915/i915_gem_context.c
@@ -340,6 +340,10 @@ void i915_gem_context_reset(struct drm_device *dev)
 			i915_gem_context_unreference(lctx);
 			ring->last_context = NULL;
 		}
+
+		/* Force the GPU state to be reinitialised on enabling */
+		if (ring->default_context)
+			ring->default_context->legacy_hw_ctx.initialized = false;
 	}
 }
 
@@ -708,7 +712,7 @@ static int do_switch(struct drm_i915_gem_request *req)
 	if (ret)
 		goto unpin_out;
 
-	if (!to->legacy_hw_ctx.initialized) {
+	if (!to->legacy_hw_ctx.initialized || i915_gem_context_is_default(to)) {
 		hw_flags |= MI_RESTORE_INHIBIT;
 		/* NB: If we inhibit the restore, the context is not allowed to
 		 * die because future work may end up depending on valid address
diff --git a/drivers/video/drm/i915/i915_guc_submission.c b/drivers/video/drm/i915/i915_guc_submission.c
index c5cebe7db9..d7e3f35a76 100644
--- a/drivers/video/drm/i915/i915_guc_submission.c
+++ b/drivers/video/drm/i915/i915_guc_submission.c
@@ -24,7 +24,6 @@
 #include <linux/firmware.h>
 #include <linux/circ_buf.h>
 #include "intel_drv.h"
-#include "i915_drv.h"
 #include "intel_guc.h"
 
 /**
diff --git a/drivers/video/drm/i915/i915_irq.c b/drivers/video/drm/i915/i915_irq.c
index b5cbd7bad6..e4bb749f8e 100644
--- a/drivers/video/drm/i915/i915_irq.c
+++ b/drivers/video/drm/i915/i915_irq.c
@@ -1657,11 +1657,11 @@ static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir)
 	for_each_pipe(dev_priv, pipe) {
 		if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
 		    intel_pipe_handle_vblank(dev, pipe))
-            /*intel_check_page_flip(dev, pipe)*/;
+			intel_check_page_flip(dev, pipe);
 
 		if (pipe_stats[pipe] & PLANE_FLIP_DONE_INT_STATUS_VLV) {
-//           intel_prepare_page_flip(dev, pipe);
-//           intel_finish_page_flip(dev, pipe);
+			intel_prepare_page_flip(dev, pipe);
+			intel_finish_page_flip(dev, pipe);
 		}
 
 		if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
@@ -2028,7 +2028,7 @@ static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
 	for_each_pipe(dev_priv, pipe) {
 		if (de_iir & DE_PIPE_VBLANK(pipe) &&
 		    intel_pipe_handle_vblank(dev, pipe))
-            /*intel_check_page_flip(dev, pipe)*/;
+			intel_check_page_flip(dev, pipe);
 
 		if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe))
 			intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
@@ -2038,8 +2038,8 @@ static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
 
 		/* plane/pipes map 1:1 on ilk+ */
 		if (de_iir & DE_PLANE_FLIP_DONE(pipe)) {
-//			intel_prepare_page_flip(dev, pipe);
-//			intel_finish_page_flip_plane(dev, pipe);
+			intel_prepare_page_flip(dev, pipe);
+			intel_finish_page_flip_plane(dev, pipe);
 		}
 	}
 
@@ -2081,12 +2081,12 @@ static void ivb_display_irq_handler(struct drm_device *dev, u32 de_iir)
 	for_each_pipe(dev_priv, pipe) {
 		if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)) &&
 		    intel_pipe_handle_vblank(dev, pipe))
-            /*intel_check_page_flip(dev, pipe)*/;
+			intel_check_page_flip(dev, pipe);
 
 		/* plane/pipes map 1:1 on ilk+ */
 		if (de_iir & DE_PLANE_FLIP_DONE_IVB(pipe)) {
-//			intel_prepare_page_flip(dev, pipe);
-//			intel_finish_page_flip_plane(dev, pipe);
+			intel_prepare_page_flip(dev, pipe);
+			intel_finish_page_flip_plane(dev, pipe);
 		}
 	}
 
@@ -2290,13 +2290,17 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
 
 			if (pipe_iir & GEN8_PIPE_VBLANK &&
 			    intel_pipe_handle_vblank(dev, pipe))
-			/*	intel_check_page_flip(dev, pipe)*/;
+				intel_check_page_flip(dev, pipe);
 
 			if (INTEL_INFO(dev_priv)->gen >= 9)
 				flip_done = pipe_iir & GEN9_PIPE_PLANE1_FLIP_DONE;
 			else
 				flip_done = pipe_iir & GEN8_PIPE_PRIMARY_FLIP_DONE;
 
+			if (flip_done) {
+				intel_prepare_page_flip(dev, pipe);
+				intel_finish_page_flip_plane(dev, pipe);
+			}
 
 			if (pipe_iir & GEN8_PIPE_CDCLK_CRC_DONE)
 				hsw_pipe_crc_irq_handler(dev, pipe);
@@ -2335,9 +2339,13 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
 				spt_irq_handler(dev, pch_iir);
 			else
 				cpt_irq_handler(dev, pch_iir);
-		} else
-			DRM_ERROR("The master control interrupt lied (SDE)!\n");
-
+		} else {
+			/*
+			 * Like on previous PCH there seems to be something
+			 * fishy going on with forwarding PCH interrupts.
+			 */
+			DRM_DEBUG_DRIVER("The master control interrupt lied (SDE)!\n");
+		}
 	}
 
 	I915_WRITE_FW(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
@@ -2363,6 +2371,8 @@ static void i915_error_wake_up(struct drm_i915_private *dev_priv,
 	for_each_ring(ring, dev_priv, i)
 		wake_up_all(&ring->irq_queue);
 
+	/* Wake up intel_crtc_wait_for_pending_flips, holding crtc->mutex. */
+	wake_up_all(&dev_priv->pending_flip_queue);
 
 	/*
 	 * Signal tasks blocked in i915_gem_wait_for_error that the pending
@@ -3775,12 +3785,12 @@ static bool i8xx_handle_vblank(struct drm_device *dev,
 	if (I915_READ16(ISR) & flip_pending)
 		goto check_page_flip;
 
-//   intel_prepare_page_flip(dev, plane);
-//   intel_finish_page_flip(dev, pipe);
+	intel_prepare_page_flip(dev, plane);
+	intel_finish_page_flip(dev, pipe);
 	return true;
 
 check_page_flip:
-//   intel_check_page_flip(dev, pipe);
+	intel_check_page_flip(dev, pipe);
 	return false;
 }
 
@@ -3959,9 +3969,12 @@ static bool i915_handle_vblank(struct drm_device *dev,
 	if (I915_READ(ISR) & flip_pending)
 		goto check_page_flip;
 
+	intel_prepare_page_flip(dev, plane);
+	intel_finish_page_flip(dev, pipe);
 	return true;
 
 check_page_flip:
+	intel_check_page_flip(dev, pipe);
 	return false;
 }
 
@@ -4449,7 +4462,7 @@ int intel_irq_install(struct drm_i915_private *dev_priv)
 void intel_irq_uninstall(struct drm_i915_private *dev_priv)
 {
 //	drm_irq_uninstall(dev_priv->dev);
-//	intel_hpd_cancel_work(dev_priv);
+	intel_hpd_cancel_work(dev_priv);
 	dev_priv->pm.irqs_enabled = false;
 }
 
diff --git a/drivers/video/drm/i915/i915_trace.h b/drivers/video/drm/i915/i915_trace.h
index 00558d9d28..84199fc161 100644
--- a/drivers/video/drm/i915/i915_trace.h
+++ b/drivers/video/drm/i915/i915_trace.h
@@ -44,4 +44,7 @@
 #define trace_i915_va_alloc(vm,start,size,name)
 #define trace_i915_gem_request_notify(ring)
 #define trace_i915_gem_object_pread(obj, offset, size)
+#define trace_i915_flip_complete(plane, pending_flip_obj)
+#define trace_i915_flip_request(plane, obj)
+
 #endif
diff --git a/drivers/video/drm/i915/intel_ddi.c b/drivers/video/drm/i915/intel_ddi.c
index a6752a61d9..7e6158b889 100644
--- a/drivers/video/drm/i915/intel_ddi.c
+++ b/drivers/video/drm/i915/intel_ddi.c
@@ -1582,7 +1582,8 @@ skl_ddi_pll_select(struct intel_crtc *intel_crtc,
 			 DPLL_CFGCR2_KDIV(wrpll_params.kdiv) |
 			 DPLL_CFGCR2_PDIV(wrpll_params.pdiv) |
 			 wrpll_params.central_freq;
-	} else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
+	} else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
+		   intel_encoder->type == INTEL_OUTPUT_DP_MST) {
 		switch (crtc_state->port_clock / 2) {
 		case 81000:
 			ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, 0);
diff --git a/drivers/video/drm/i915/intel_display.c b/drivers/video/drm/i915/intel_display.c
index 571d2e095f..21afb7f7e8 100644
--- a/drivers/video/drm/i915/intel_display.c
+++ b/drivers/video/drm/i915/intel_display.c
@@ -3945,13 +3945,13 @@ static void page_flip_completed(struct intel_crtc *intel_crtc)
 
 	drm_crtc_vblank_put(&intel_crtc->base);
 
-//	wake_up_all(&dev_priv->pending_flip_queue);
-//	queue_work(dev_priv->wq, &work->work);
+	wake_up_all(&dev_priv->pending_flip_queue);
+	queue_work(dev_priv->wq, &work->work);
 
-//	trace_i915_flip_complete(intel_crtc->plane,
-//				 work->pending_flip_obj);
+	trace_i915_flip_complete(intel_crtc->plane,
+				 work->pending_flip_obj);
 }
-#if 0
+
 void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
@@ -3977,7 +3977,6 @@ void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
 		mutex_unlock(&dev->struct_mutex);
 	}
 }
-#endif
 
 /* Program iCLKIP clock to the desired frequency */
 static void lpt_program_iclkip(struct drm_crtc *crtc)
@@ -4851,6 +4850,9 @@ static void intel_pre_plane_update(struct intel_crtc *crtc)
 		mutex_unlock(&dev->struct_mutex);
 	}
 
+	if (atomic->wait_for_flips)
+		intel_crtc_wait_for_pending_flips(&crtc->base);
+
 	if (atomic->disable_fbc)
 		intel_fbc_disable_crtc(crtc);
 
@@ -4883,7 +4885,7 @@ static void intel_crtc_disable_planes(struct drm_crtc *crtc, unsigned plane_mask
 	 * to compute the mask of flip planes precisely. For the time being
 	 * consider this a flip to a NULL plane.
 	 */
-//	intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(pipe));
+	intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(pipe));
 }
 
 static void ironlake_crtc_enable(struct drm_crtc *crtc)
@@ -6320,6 +6322,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
 		return;
 
 	if (to_intel_plane_state(crtc->primary->state)->visible) {
+		intel_crtc_wait_for_pending_flips(crtc);
 		intel_pre_disable_primary(crtc);
 
 		intel_crtc_disable_planes(crtc, 1 << drm_plane_index(crtc->primary));
@@ -10910,7 +10913,7 @@ static inline void intel_mark_page_flip_active(struct intel_unpin_work *work)
 	/* and that it is marked active as soon as the irq could fire. */
 	smp_wmb();
 }
-#if 0
+
 static int intel_gen2_queue_flip(struct drm_device *dev,
 				 struct drm_crtc *crtc,
 				 struct drm_framebuffer *fb,
@@ -11373,8 +11376,6 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_unpin_work *work;
 
-	WARN_ON(!in_interrupt());
-
 	if (crtc == NULL)
 		return;
 
@@ -11391,7 +11392,7 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
 		intel_queue_rps_boost_for_request(dev, work->flip_queued_req);
 	spin_unlock(&dev->event_lock);
 }
-#endif
+
 static int intel_crtc_page_flip(struct drm_crtc *crtc,
 				struct drm_framebuffer *fb,
 				struct drm_pending_vblank_event *event,
@@ -11441,7 +11442,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	work->event = event;
 	work->crtc = crtc;
 	work->old_fb = old_fb;
-//	INIT_WORK(&work->work, intel_unpin_work_fn);
+	INIT_WORK(&work->work, intel_unpin_work_fn);
 
 	ret = drm_crtc_vblank_get(crtc);
 	if (ret)
@@ -11468,8 +11469,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 	intel_crtc->unpin_work = work;
 	spin_unlock_irq(&dev->event_lock);
 
-	if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
-		flush_workqueue(dev_priv->wq);
+//   if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
+//       flush_workqueue(dev_priv->wq);
 
 	/* Reference the objects for the scheduled work. */
 	drm_framebuffer_reference(work->old_fb);
@@ -11927,11 +11928,21 @@ connected_sink_compute_bpp(struct intel_connector *connector,
 		pipe_config->pipe_bpp = connector->base.display_info.bpc*3;
 	}
 
-	/* Clamp bpp to 8 on screens without EDID 1.4 */
-	if (connector->base.display_info.bpc == 0 && bpp > 24) {
-		DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of 24\n",
-			      bpp);
-		pipe_config->pipe_bpp = 24;
+	/* Clamp bpp to default limit on screens without EDID 1.4 */
+	if (connector->base.display_info.bpc == 0) {
+		int type = connector->base.connector_type;
+		int clamp_bpp = 24;
+
+		/* Fall back to 18 bpp when DP sink capability is unknown. */
+		if (type == DRM_MODE_CONNECTOR_DisplayPort ||
+		    type == DRM_MODE_CONNECTOR_eDP)
+			clamp_bpp = 18;
+
+		if (bpp > clamp_bpp) {
+			DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of %d\n",
+				      bpp, clamp_bpp);
+			pipe_config->pipe_bpp = clamp_bpp;
+		}
 	}
 }
 
@@ -13317,7 +13328,7 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
 	.gamma_set = intel_crtc_gamma_set,
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = intel_crtc_destroy,
-//	.page_flip = intel_crtc_page_flip,
+	.page_flip = intel_crtc_page_flip,
 	.atomic_duplicate_state = intel_crtc_duplicate_state,
 	.atomic_destroy_state = intel_crtc_destroy_state,
 };
@@ -13534,11 +13545,12 @@ intel_check_primary_plane(struct drm_plane *plane,
 	int max_scale = DRM_PLANE_HELPER_NO_SCALING;
 	bool can_position = false;
 
+	if (INTEL_INFO(plane->dev)->gen >= 9) {
 	/* use scaler when colorkey is not required */
-	if (INTEL_INFO(plane->dev)->gen >= 9 &&
-	    state->ckey.flags == I915_SET_COLORKEY_NONE) {
+		if (state->ckey.flags == I915_SET_COLORKEY_NONE) {
 		min_scale = 1;
 		max_scale = skl_max_scale(to_intel_crtc(crtc), crtc_state);
+		}
 		can_position = true;
 	}
 
@@ -14628,10 +14640,33 @@ static void intel_init_display(struct drm_device *dev)
 			broxton_modeset_calc_cdclk;
 	}
 
+	switch (INTEL_INFO(dev)->gen) {
+	case 2:
+		dev_priv->display.queue_flip = intel_gen2_queue_flip;
+		break;
 
+	case 3:
+		dev_priv->display.queue_flip = intel_gen3_queue_flip;
+		break;
 
+	case 4:
+	case 5:
+		dev_priv->display.queue_flip = intel_gen4_queue_flip;
+		break;
 
-
+	case 6:
+		dev_priv->display.queue_flip = intel_gen6_queue_flip;
+		break;
+	case 7:
+	case 8: /* FIXME(BDW): Check that the gen8 RCS flip works. */
+		dev_priv->display.queue_flip = intel_gen7_queue_flip;
+		break;
+	case 9:
+		/* Drop through - unsupported since execlist only. */
+	default:
+		/* Default just returns -ENODEV to indicate unsupported */
+		dev_priv->display.queue_flip = intel_default_queue_flip;
+	}
 
 	mutex_init(&dev_priv->pps_mutex);
 }
diff --git a/drivers/video/drm/i915/intel_dp.c b/drivers/video/drm/i915/intel_dp.c
index a7ea0677b0..8f64829299 100644
--- a/drivers/video/drm/i915/intel_dp.c
+++ b/drivers/video/drm/i915/intel_dp.c
@@ -1894,7 +1894,7 @@ static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
 	 * operations.
 	 */
 	delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
-//   schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
+	schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
 }
 
 /*
@@ -5756,7 +5756,7 @@ void intel_edp_drrs_flush(struct drm_device *dev,
 	if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED)
 		return;
 
-//	cancel_delayed_work(&dev_priv->drrs.work);
+	cancel_delayed_work(&dev_priv->drrs.work);
 
 	mutex_lock(&dev_priv->drrs.mutex);
 	if (!dev_priv->drrs.dp) {
@@ -5776,6 +5776,13 @@ void intel_edp_drrs_flush(struct drm_device *dev,
 				dev_priv->drrs.dp->attached_connector->panel.
 				fixed_mode->vrefresh);
 
+	/*
+	 * flush also means no more activity hence schedule downclock, if all
+	 * other fbs are quiescent too
+	 */
+	if (!dev_priv->drrs.busy_frontbuffer_bits)
+		schedule_delayed_work(&dev_priv->drrs.work,
+				msecs_to_jiffies(1000));
 	mutex_unlock(&dev_priv->drrs.mutex);
 }
 
diff --git a/drivers/video/drm/i915/intel_drv.h b/drivers/video/drm/i915/intel_drv.h
index 1135071e17..3afe477625 100644
--- a/drivers/video/drm/i915/intel_drv.h
+++ b/drivers/video/drm/i915/intel_drv.h
@@ -117,7 +117,7 @@ enum intel_output_type {
 
 struct intel_framebuffer {
 	struct drm_framebuffer base;
-    struct drm_i915_gem_object *obj;
+	struct drm_i915_gem_object *obj;
     void   *private;
 };
 
diff --git a/drivers/video/drm/i915/intel_dsi_panel_vbt.c b/drivers/video/drm/i915/intel_dsi_panel_vbt.c
index 7594f25e7d..5c0ed4d5e7 100644
--- a/drivers/video/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/video/drm/i915/intel_dsi_panel_vbt.c
@@ -207,7 +207,12 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
 	gpio = *data++;
 
 	/* pull up/down */
-	action = *data++;
+	action = *data++ & 1;
+
+	if (gpio >= ARRAY_SIZE(gtable)) {
+		DRM_DEBUG_KMS("unknown gpio %u\n", gpio);
+		goto out;
+	}
 
 	function = gtable[gpio].function_reg;
 	pad = gtable[gpio].pad_reg;
@@ -226,6 +231,7 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
 	vlv_gpio_nc_write(dev_priv, pad, val);
 	mutex_unlock(&dev_priv->sb_lock);
 
+out:
 	return data;
 }
 
diff --git a/drivers/video/drm/i915/intel_hotplug.c b/drivers/video/drm/i915/intel_hotplug.c
new file mode 100644
index 0000000000..d7a6437d9d
--- /dev/null
+++ b/drivers/video/drm/i915/intel_hotplug.c
@@ -0,0 +1,513 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+
+#include <drm/drmP.h>
+#include <drm/i915_drm.h>
+
+#include "i915_drv.h"
+#include "intel_drv.h"
+
+/**
+ * DOC: Hotplug
+ *
+ * Simply put, hotplug occurs when a display is connected to or disconnected
+ * from the system. However, there may be adapters and docking stations and
+ * Display Port short pulses and MST devices involved, complicating matters.
+ *
+ * Hotplug in i915 is handled in many different levels of abstraction.
+ *
+ * The platform dependent interrupt handling code in i915_irq.c enables,
+ * disables, and does preliminary handling of the interrupts. The interrupt
+ * handlers gather the hotplug detect (HPD) information from relevant registers
+ * into a platform independent mask of hotplug pins that have fired.
+ *
+ * The platform independent interrupt handler intel_hpd_irq_handler() in
+ * intel_hotplug.c does hotplug irq storm detection and mitigation, and passes
+ * further processing to appropriate bottom halves (Display Port specific and
+ * regular hotplug).
+ *
+ * The Display Port work function i915_digport_work_func() calls into
+ * intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long
+ * pulses, with failures and non-MST long pulses triggering regular hotplug
+ * processing on the connector.
+ *
+ * The regular hotplug work function i915_hotplug_work_func() calls connector
+ * detect hooks, and, if connector status changes, triggers sending of hotplug
+ * uevent to userspace via drm_kms_helper_hotplug_event().
+ *
+ * Finally, the userspace is responsible for triggering a modeset upon receiving
+ * the hotplug uevent, disabling or enabling the crtc as needed.
+ *
+ * The hotplug interrupt storm detection and mitigation code keeps track of the
+ * number of interrupts per hotplug pin per a period of time, and if the number
+ * of interrupts exceeds a certain threshold, the interrupt is disabled for a
+ * while before being re-enabled. The intention is to mitigate issues raising
+ * from broken hardware triggering massive amounts of interrupts and grinding
+ * the system to a halt.
+ *
+ * Current implementation expects that hotplug interrupt storm will not be
+ * seen when display port sink is connected, hence on platforms whose DP
+ * callback is handled by i915_digport_work_func reenabling of hpd is not
+ * performed (it was never expected to be disabled in the first place ;) )
+ * this is specific to DP sinks handled by this routine and any other display
+ * such as HDMI or DVI enabled on the same port will have proper logic since
+ * it will use i915_hotplug_work_func where this logic is handled.
+ */
+
+bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port)
+{
+	switch (pin) {
+	case HPD_PORT_A:
+		*port = PORT_A;
+		return true;
+	case HPD_PORT_B:
+		*port = PORT_B;
+		return true;
+	case HPD_PORT_C:
+		*port = PORT_C;
+		return true;
+	case HPD_PORT_D:
+		*port = PORT_D;
+		return true;
+	case HPD_PORT_E:
+		*port = PORT_E;
+		return true;
+	default:
+		return false;	/* no hpd */
+	}
+}
+
+#define HPD_STORM_DETECT_PERIOD		1000
+#define HPD_STORM_THRESHOLD		5
+#define HPD_STORM_REENABLE_DELAY	(2 * 60 * 1000)
+
+/**
+ * intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin
+ * @dev_priv: private driver data pointer
+ * @pin: the pin to gather stats on
+ *
+ * Gather stats about HPD irqs from the specified @pin, and detect irq
+ * storms. Only the pin specific stats and state are changed, the caller is
+ * responsible for further action.
+ *
+ * @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
+ * otherwise it's considered an irq storm, and the irq state is set to
+ * @HPD_MARK_DISABLED.
+ *
+ * Return true if an irq storm was detected on @pin.
+ */
+static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
+				       enum hpd_pin pin)
+{
+	unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
+	unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
+	bool storm = false;
+
+	if (!time_in_range(jiffies, start, end)) {
+		dev_priv->hotplug.stats[pin].last_jiffies = jiffies;
+		dev_priv->hotplug.stats[pin].count = 0;
+		DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin);
+	} else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) {
+		dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED;
+		DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin);
+		storm = true;
+	} else {
+		dev_priv->hotplug.stats[pin].count++;
+		DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin,
+			      dev_priv->hotplug.stats[pin].count);
+	}
+
+	return storm;
+}
+
+static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	enum hpd_pin pin;
+	bool hpd_disabled = false;
+
+	assert_spin_locked(&dev_priv->irq_lock);
+
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		if (connector->polled != DRM_CONNECTOR_POLL_HPD)
+			continue;
+
+		intel_connector = to_intel_connector(connector);
+		intel_encoder = intel_connector->encoder;
+		if (!intel_encoder)
+			continue;
+
+		pin = intel_encoder->hpd_pin;
+		if (pin == HPD_NONE ||
+		    dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
+			continue;
+
+		DRM_INFO("HPD interrupt storm detected on connector %s: "
+			 "switching from hotplug detection to polling\n",
+			 connector->name);
+
+		dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
+		connector->polled = DRM_CONNECTOR_POLL_CONNECT
+			| DRM_CONNECTOR_POLL_DISCONNECT;
+		hpd_disabled = true;
+	}
+
+	/* Enable polling and queue hotplug re-enabling. */
+	if (hpd_disabled) {
+		drm_kms_helper_poll_enable_locked(dev);
+		mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
+				 msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
+	}
+}
+
+static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, typeof(*dev_priv),
+			     hotplug.reenable_work.work);
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	int i;
+
+	intel_runtime_pm_get(dev_priv);
+
+	spin_lock_irq(&dev_priv->irq_lock);
+	for_each_hpd_pin(i) {
+		struct drm_connector *connector;
+
+		if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
+			continue;
+
+		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
+
+		list_for_each_entry(connector, &mode_config->connector_list, head) {
+			struct intel_connector *intel_connector = to_intel_connector(connector);
+
+			if (intel_connector->encoder->hpd_pin == i) {
+				if (connector->polled != intel_connector->polled)
+					DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
+							 connector->name);
+				connector->polled = intel_connector->polled;
+				if (!connector->polled)
+					connector->polled = DRM_CONNECTOR_POLL_HPD;
+			}
+		}
+	}
+	if (dev_priv->display.hpd_irq_setup)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	intel_runtime_pm_put(dev_priv);
+}
+
+static bool intel_hpd_irq_event(struct drm_device *dev,
+				struct drm_connector *connector)
+{
+	enum drm_connector_status old_status;
+
+	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+	old_status = connector->status;
+
+	connector->status = connector->funcs->detect(connector, false);
+	if (old_status == connector->status)
+		return false;
+
+	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
+		      connector->base.id,
+		      connector->name,
+		      drm_get_connector_status_name(old_status),
+		      drm_get_connector_status_name(connector->status));
+
+	return true;
+}
+
+static void i915_digport_work_func(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private, hotplug.dig_port_work);
+	u32 long_port_mask, short_port_mask;
+	struct intel_digital_port *intel_dig_port;
+	int i;
+	u32 old_bits = 0;
+
+	spin_lock_irq(&dev_priv->irq_lock);
+	long_port_mask = dev_priv->hotplug.long_port_mask;
+	dev_priv->hotplug.long_port_mask = 0;
+	short_port_mask = dev_priv->hotplug.short_port_mask;
+	dev_priv->hotplug.short_port_mask = 0;
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	for (i = 0; i < I915_MAX_PORTS; i++) {
+		bool valid = false;
+		bool long_hpd = false;
+		intel_dig_port = dev_priv->hotplug.irq_port[i];
+		if (!intel_dig_port || !intel_dig_port->hpd_pulse)
+			continue;
+
+		if (long_port_mask & (1 << i))  {
+			valid = true;
+			long_hpd = true;
+		} else if (short_port_mask & (1 << i))
+			valid = true;
+
+		if (valid) {
+			enum irqreturn ret;
+
+			ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
+			if (ret == IRQ_NONE) {
+				/* fall back to old school hpd */
+				old_bits |= (1 << intel_dig_port->base.hpd_pin);
+			}
+		}
+	}
+
+	if (old_bits) {
+		spin_lock_irq(&dev_priv->irq_lock);
+		dev_priv->hotplug.event_bits |= old_bits;
+		spin_unlock_irq(&dev_priv->irq_lock);
+		schedule_work(&dev_priv->hotplug.hotplug_work);
+	}
+}
+
+/*
+ * Handle hotplug events outside the interrupt handler proper.
+ */
+static void i915_hotplug_work_func(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private, hotplug.hotplug_work);
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	bool changed = false;
+	u32 hpd_event_bits;
+
+	mutex_lock(&mode_config->mutex);
+	DRM_DEBUG_KMS("running encoder hotplug functions\n");
+
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	hpd_event_bits = dev_priv->hotplug.event_bits;
+	dev_priv->hotplug.event_bits = 0;
+
+	/* Disable hotplug on connectors that hit an irq storm. */
+	intel_hpd_irq_storm_disable(dev_priv);
+
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		intel_connector = to_intel_connector(connector);
+		if (!intel_connector->encoder)
+			continue;
+		intel_encoder = intel_connector->encoder;
+		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
+			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
+				      connector->name, intel_encoder->hpd_pin);
+			if (intel_encoder->hot_plug)
+				intel_encoder->hot_plug(intel_encoder);
+			if (intel_hpd_irq_event(dev, connector))
+				changed = true;
+		}
+	}
+	mutex_unlock(&mode_config->mutex);
+
+	if (changed)
+		drm_kms_helper_hotplug_event(dev);
+}
+
+
+/**
+ * intel_hpd_irq_handler - main hotplug irq handler
+ * @dev: drm device
+ * @pin_mask: a mask of hpd pins that have triggered the irq
+ * @long_mask: a mask of hpd pins that may be long hpd pulses
+ *
+ * This is the main hotplug irq handler for all platforms. The platform specific
+ * irq handlers call the platform specific hotplug irq handlers, which read and
+ * decode the appropriate registers into bitmasks about hpd pins that have
+ * triggered (@pin_mask), and which of those pins may be long pulses
+ * (@long_mask). The @long_mask is ignored if the port corresponding to the pin
+ * is not a digital port.
+ *
+ * Here, we do hotplug irq storm detection and mitigation, and pass further
+ * processing to appropriate bottom halves.
+ */
+void intel_hpd_irq_handler(struct drm_device *dev,
+			   u32 pin_mask, u32 long_mask)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int i;
+	enum port port;
+	bool storm_detected = false;
+	bool queue_dig = false, queue_hp = false;
+	bool is_dig_port;
+
+	if (!pin_mask)
+		return;
+
+	spin_lock(&dev_priv->irq_lock);
+	for_each_hpd_pin(i) {
+		if (!(BIT(i) & pin_mask))
+			continue;
+
+		is_dig_port = intel_hpd_pin_to_port(i, &port) &&
+			      dev_priv->hotplug.irq_port[port];
+
+		if (is_dig_port) {
+			bool long_hpd = long_mask & BIT(i);
+
+			DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
+					 long_hpd ? "long" : "short");
+			/*
+			 * For long HPD pulses we want to have the digital queue happen,
+			 * but we still want HPD storm detection to function.
+			 */
+			queue_dig = true;
+			if (long_hpd) {
+				dev_priv->hotplug.long_port_mask |= (1 << port);
+			} else {
+				/* for short HPD just trigger the digital queue */
+				dev_priv->hotplug.short_port_mask |= (1 << port);
+				continue;
+			}
+		}
+
+		if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
+			/*
+			 * On GMCH platforms the interrupt mask bits only
+			 * prevent irq generation, not the setting of the
+			 * hotplug bits itself. So only WARN about unexpected
+			 * interrupts on saner platforms.
+			 */
+			WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev),
+				  "Received HPD interrupt on pin %d although disabled\n", i);
+			continue;
+		}
+
+		if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
+			continue;
+
+		if (!is_dig_port) {
+			dev_priv->hotplug.event_bits |= BIT(i);
+			queue_hp = true;
+		}
+
+		if (intel_hpd_irq_storm_detect(dev_priv, i)) {
+			dev_priv->hotplug.event_bits &= ~BIT(i);
+			storm_detected = true;
+		}
+	}
+
+	if (storm_detected)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock(&dev_priv->irq_lock);
+
+	/*
+	 * Our hotplug handler can grab modeset locks (by calling down into the
+	 * fb helpers). Hence it must not be run on our own dev-priv->wq work
+	 * queue for otherwise the flush_work in the pageflip code will
+	 * deadlock.
+	 */
+	if (queue_dig)
+		queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
+	if (queue_hp)
+		schedule_work(&dev_priv->hotplug.hotplug_work);
+}
+
+/**
+ * intel_hpd_init - initializes and enables hpd support
+ * @dev_priv: i915 device instance
+ *
+ * This function enables the hotplug support. It requires that interrupts have
+ * already been enabled with intel_irq_init_hw(). From this point on hotplug and
+ * poll request can run concurrently to other code, so locking rules must be
+ * obeyed.
+ *
+ * This is a separate step from interrupt enabling to simplify the locking rules
+ * in the driver load and resume code.
+ */
+void intel_hpd_init(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct drm_connector *connector;
+	int i;
+
+	for_each_hpd_pin(i) {
+		dev_priv->hotplug.stats[i].count = 0;
+		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
+	}
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		struct intel_connector *intel_connector = to_intel_connector(connector);
+		connector->polled = intel_connector->polled;
+
+		/* MST has a dynamic intel_connector->encoder and it's reprobing
+		 * is all handled by the MST helpers. */
+		if (intel_connector->mst_port)
+			continue;
+
+		if (!connector->polled && I915_HAS_HOTPLUG(dev) &&
+		    intel_connector->encoder->hpd_pin > HPD_NONE)
+			connector->polled = DRM_CONNECTOR_POLL_HPD;
+	}
+
+	/*
+	 * Interrupt setup is already guaranteed to be single-threaded, this is
+	 * just to make the assert_spin_locked checks happy.
+	 */
+	spin_lock_irq(&dev_priv->irq_lock);
+	if (dev_priv->display.hpd_irq_setup)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock_irq(&dev_priv->irq_lock);
+}
+
+void intel_hpd_init_work(struct drm_i915_private *dev_priv)
+{
+	INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
+	INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
+	INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
+			  intel_hpd_irq_storm_reenable_work);
+}
+
+void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
+{
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	dev_priv->hotplug.long_port_mask = 0;
+	dev_priv->hotplug.short_port_mask = 0;
+	dev_priv->hotplug.event_bits = 0;
+
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	cancel_work_sync(&dev_priv->hotplug.dig_port_work);
+	cancel_work_sync(&dev_priv->hotplug.hotplug_work);
+	cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
+}
diff --git a/drivers/video/drm/i915/intel_i2c.c b/drivers/video/drm/i915/intel_i2c.c
index 8324654037..f3bee54c41 100644
--- a/drivers/video/drm/i915/intel_i2c.c
+++ b/drivers/video/drm/i915/intel_i2c.c
@@ -675,7 +675,7 @@ int intel_setup_gmbus(struct drm_device *dev)
 	return 0;
 
 err:
-	while (--pin) {
+	while (pin--) {
 		if (!intel_gmbus_is_valid_pin(dev_priv, pin))
 			continue;
 
diff --git a/drivers/video/drm/i915/intel_lrc.c b/drivers/video/drm/i915/intel_lrc.c
index 1399b9fbf9..f0f00aad9b 100644
--- a/drivers/video/drm/i915/intel_lrc.c
+++ b/drivers/video/drm/i915/intel_lrc.c
@@ -1706,6 +1706,7 @@ static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
 	if (flush_domains) {
 		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
 		flags |= PIPE_CONTROL_FLUSH_ENABLE;
 	}
 
@@ -2359,6 +2360,7 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o
 	kunmap_atomic(reg_state);
 
 	ctx_obj->dirty = 1;
+	set_page_dirty(page);
 	i915_gem_object_unpin_pages(ctx_obj);
 
 	return 0;
diff --git a/drivers/video/drm/i915/intel_ringbuffer.c b/drivers/video/drm/i915/intel_ringbuffer.c
index 202a4ac4e1..75243651c1 100644
--- a/drivers/video/drm/i915/intel_ringbuffer.c
+++ b/drivers/video/drm/i915/intel_ringbuffer.c
@@ -347,6 +347,7 @@ gen7_render_ring_flush(struct drm_i915_gem_request *req,
 	if (flush_domains) {
 		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
 		flags |= PIPE_CONTROL_FLUSH_ENABLE;
 	}
 	if (invalidate_domains) {
@@ -419,6 +420,7 @@ gen8_render_ring_flush(struct drm_i915_gem_request *req,
 	if (flush_domains) {
 		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
 		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
 		flags |= PIPE_CONTROL_FLUSH_ENABLE;
 	}
 	if (invalidate_domains) {
diff --git a/drivers/video/drm/i915/kms_display.c b/drivers/video/drm/i915/kms_display.c
index 63984a1fae..7a6c356a9b 100644
--- a/drivers/video/drm/i915/kms_display.c
+++ b/drivers/video/drm/i915/kms_display.c
@@ -10,16 +10,10 @@
 #include <linux/pci.h>
 
 #include <syscall.h>
-
-//#include "bitmap.h"
 #include <display.h>
 
-void  FASTCALL sysSetFramebuffer(void *fb)__asm__("SetFramebuffer");
-void kolibri_framebuffer_update(struct drm_i915_private *dev_priv, struct kos_framebuffer *kfb);
 void init_system_cursors(struct drm_device *dev);
 
-addr_t dummy_fb_page;
-
 display_t *os_display;
 
 u32 cmd_buffer;
@@ -53,33 +47,24 @@ static int count_connector_modes(struct drm_connector* connector)
 
 struct drm_framebuffer *get_framebuffer(struct drm_device *dev, struct drm_display_mode *mode, int tiling)
 {
-    struct drm_i915_private *dev_priv = dev->dev_private;
-    struct intel_fbdev     *ifbdev = dev_priv->fbdev;
-    struct intel_framebuffer *intel_fb = ifbdev->fb;
-    struct drm_framebuffer *fb = &intel_fb->base;
+    struct drm_i915_private    *dev_priv = dev->dev_private;
+    struct intel_fbdev         *ifbdev   = dev_priv->fbdev;
+    struct intel_framebuffer   *intel_fb = ifbdev->fb;
+    struct drm_framebuffer     *fb = &intel_fb->base;
     struct drm_i915_gem_object *obj = NULL;
     int stride, size;
 
-ENTER();
-
     stride = mode->hdisplay *4;
 
+    if(IS_GEN3(dev))
+        tiling = 0;
+
     if(tiling)
     {
         int gen3size;
 
-        if(IS_GEN3(dev))
-            for (stride = 512; stride < mode->hdisplay * 4; stride <<= 1);
-        else
             stride = ALIGN(stride, 512);
         size = stride * ALIGN(mode->vdisplay, 8);
-
-        if(IS_GEN3(dev))
-        {
-            for (gen3size = 1024*1024; gen3size < size; gen3size <<= 1);
-            size = gen3size;
-        }
-        else
             size = ALIGN(size, 4096);
     }
     else
@@ -96,6 +81,7 @@ ENTER();
         int ret;
 
         DRM_DEBUG_KMS("remove old framebuffer\n");
+        set_fake_framebuffer();
         drm_framebuffer_remove(fb);
         ifbdev->fb = NULL;
         fb = NULL;
@@ -172,7 +158,7 @@ ENTER();
 
     fb->bits_per_pixel = 32;
     fb->depth = 24;
-LEAVE();
+
     return fb;
 
 out_fb:
@@ -282,7 +268,7 @@ do_set:
     {
         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
         struct kos_framebuffer *kfb = intel_fb->private;
-        kolibri_framebuffer_update(dev_priv, kfb);
+        kolibri_framebuffer_update(dev, kfb);
         DRM_DEBUG_KMS("kolibri framebuffer %p\n", kfb);
 
         os_display->width    = mode->hdisplay;
@@ -378,7 +364,7 @@ static int set_mode_ex(struct drm_device *dev,
     {
         struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
         struct kos_framebuffer *kfb = intel_fb->private;
-        kolibri_framebuffer_update(dev_priv, kfb);
+        kolibri_framebuffer_update(dev, kfb);
         DRM_DEBUG_KMS("kolibri framebuffer %p\n", kfb);
 
         os_display->width    = mode->hdisplay;
@@ -575,8 +561,6 @@ ENTER();
         return -1;
     };
 
-    dummy_fb_page = AllocPage();
-
     os_display = GetDisplay();
     os_display->ddev = dev;
     os_display->connector = connector;
@@ -815,7 +799,7 @@ int i915_fbinfo(struct drm_i915_fb_info *fb)
         fb->name   = obj->base.name;
         fb->width  = os_display->width;
         fb->height = os_display->height;
-        fb->pitch  = obj->stride;
+        fb->pitch  = os_display->lfb_pitch;
         fb->tiling = obj->tiling_mode;
         fb->crtc   = crtc->base.base.id;
         fb->pipe   = crtc->pipe;
@@ -825,111 +809,6 @@ int i915_fbinfo(struct drm_i915_fb_info *fb)
     return 0;
 }
 
-int kolibri_framebuffer_init(struct intel_framebuffer *intel_fb)
-{
-    struct kos_framebuffer *kfb;
-    addr_t dummy_table;
-    addr_t *pt_addr = NULL;
-    int pde;
-
-    kfb = kzalloc(sizeof(struct kos_framebuffer),0);
-    kfb->private = intel_fb;
-
-    for(pde = 0; pde < 8; pde++)
-    {
-        dummy_table = AllocPage();
-        kfb->pde[pde] = dummy_table|PG_UW;
-
-        pt_addr = kmap((struct page*)dummy_table);
-        __builtin_memset(pt_addr,0,4096);
-        kunmap((struct page*)dummy_table);
-    };
-
-    intel_fb->private = kfb;
-
-    return 0;
-#if 0
-    struct sg_page_iter sg_iter;
-    num_pages = obj->base.size/4096;
-    printf("num_pages %d\n",num_pages);
-
-    pte = 0;
-    pde = 0;
-    pt_addr = NULL;
-
-    __sg_page_iter_start(&sg_iter, obj->pages->sgl, sg_nents(obj->pages->sgl), 0);
-    while (__sg_page_iter_next(&sg_iter))
-    {
-        if (pt_addr == NULL)
-        {
-            addr_t pt = AllocPage();
-            kfb->pde[pde] = pt|PG_UW;
-            pde++;
-            pt_addr = kmap_atomic((struct page*)pt);
-        }
-        pt_addr[pte] = sg_page_iter_dma_address(&sg_iter)|PG_UW|PG_WRITEC;
-        if( (pte & 15) == 0)
-            DRM_DEBUG_KMS("pte %x\n",pt_addr[pte]);
-        if (++pte == 1024)
-        {
-            kunmap_atomic(pt_addr);
-            pt_addr = NULL;
-            if (pde == 8)
-                break;
-            pte = 0;
-        }
-    }
-
-    if(pt_addr)
-    {
-        for(;pte < 1024; pte++)
-            pt_addr[pte] = dummy_page|PG_UW;
-        kunmap_atomic(pt_addr);
-    }
-#endif
-};
-
-void kolibri_framebuffer_update(struct drm_i915_private *dev_priv, struct kos_framebuffer *kfb)
-{
-    struct intel_framebuffer *intel_fb = kfb->private;
-    addr_t *pt_addr = NULL;
-    int pte = 0;
-    int pde = 0;
-    int num_pages;
-    addr_t pfn;
-ENTER();
-    num_pages = intel_fb->obj->base.size/4096;
-    pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(intel_fb->obj);
-
-    while(num_pages)
-    {
-        if (pt_addr == NULL)
-        {
-            addr_t pt = kfb->pde[pde] & 0xFFFFF000;
-            pde++;
-            pt_addr = kmap_atomic((struct page*)pt);
-        }
-        pt_addr[pte] = pfn|PG_UW|PG_WRITEC;
-        pfn+= 4096;
-        num_pages--;
-        if (++pte == 1024)
-        {
-            kunmap_atomic(pt_addr);
-            pt_addr = NULL;
-            if (pde == 8)
-                break;
-            pte = 0;
-        }
-    }
-
-    if(pt_addr)
-    {
-        for(;pte < 1024; pte++)
-            pt_addr[pte] = dummy_fb_page|PG_UW;
-        kunmap_atomic(pt_addr);
-    }
-LEAVE();
-};
 
 typedef struct
 {
@@ -1411,6 +1290,3 @@ int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *
     list_del_init(&wait->task_list);
     return 1;
 }
-
-
-
diff --git a/drivers/video/drm/i915/kos_fb.c b/drivers/video/drm/i915/kos_fb.c
new file mode 100644
index 0000000000..1be1a4354c
--- /dev/null
+++ b/drivers/video/drm/i915/kos_fb.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright © 2008-2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#include <drm/drmP.h>
+#include <drm/i915_drm.h>
+#include <display.h>
+#include "intel_drv.h"
+#include "i915_drv.h"
+
+static addr_t dummy_fb_page;
+static struct kos_framebuffer *fake_fb;
+
+int fake_framebuffer_create()
+{
+    struct kos_framebuffer *kfb;
+    addr_t dummy_table;
+    addr_t *pt_addr;
+    int pde, pte;
+
+    kfb = kzalloc(sizeof(struct kos_framebuffer),0);
+    if(kfb == NULL)
+        goto err_0;
+
+    dummy_fb_page = AllocPage();
+    if(dummy_fb_page == 0)
+        goto err_1;
+
+    for(pde = 0; pde < 8; pde++)
+    {
+        dummy_table = AllocPage();
+        if(dummy_table == 0)
+            goto err_2;
+
+        kfb->pde[pde] = dummy_table|PG_UW;
+
+        pt_addr = kmap_atomic((struct page*)dummy_table);
+        for(pte = 0; pte < 1024; pte++)
+            pt_addr[pte] = dummy_fb_page|PG_UW;
+        kunmap_atomic(pt_addr);
+    };
+
+    fake_fb = kfb;
+
+    return 0;
+
+err_2:
+    for(pte = 0; pte < pde; pte++)
+        FreePage(kfb->pde[pte]);
+    FreePage(dummy_fb_page);
+err_1:
+    kfree(kfb);
+err_0:
+    return -ENOMEM;
+};
+
+int kolibri_framebuffer_init(void *param)
+{
+    struct intel_framebuffer *intel_fb = param;
+    struct kos_framebuffer *kfb;
+    addr_t dummy_table;
+    addr_t *pt_addr = NULL;
+    int pde, pte;
+
+    kfb = kzalloc(sizeof(struct kos_framebuffer),0);
+    if(kfb == NULL)
+        goto err_0;
+
+    kfb->private = intel_fb;
+
+    for(pde = 0; pde < 8; pde++)
+    {
+        dummy_table = AllocPage();
+        if(dummy_table == 0)
+            goto err_1;
+
+        kfb->pde[pde] = dummy_table|PG_UW;
+
+        pt_addr = kmap_atomic((struct page*)dummy_table);
+        for(pte = 0; pte < 1024; pte++)
+            pt_addr[pte] = dummy_fb_page|PG_UW;
+        kunmap_atomic(pt_addr);
+    };
+
+    intel_fb->private = kfb;
+
+    return 0;
+err_1:
+    for(pte = 0; pte < pde; pte++)
+        FreePage(kfb->pde[pte]);
+    kfree(kfb);
+err_0:
+    return -ENOMEM;
+};
+
+void kolibri_framebuffer_update(struct drm_device *dev, struct kos_framebuffer *kfb)
+{
+    struct drm_i915_private *dev_priv = dev->dev_private;
+    struct intel_framebuffer *intel_fb = kfb->private;
+    addr_t *pt_addr = NULL;
+    int pte = 0;
+    int pde = 0;
+    int num_pages;
+    addr_t pfn;
+
+    num_pages = intel_fb->obj->base.size/4096;
+    pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(intel_fb->obj);
+
+    while(num_pages)
+    {
+        if (pt_addr == NULL)
+        {
+            addr_t pt = kfb->pde[pde] & 0xFFFFF000;
+            pde++;
+            pt_addr = kmap_atomic((struct page*)pt);
+        }
+        pt_addr[pte] = pfn|PG_UW|PG_WRITEC;
+        pfn+= 4096;
+        num_pages--;
+        if (++pte == 1024)
+        {
+            kunmap_atomic(pt_addr);
+            pt_addr = NULL;
+            if (pde == 8)
+                break;
+            pte = 0;
+        }
+    }
+
+    if(pt_addr)
+    {
+        for(; pte < 1024; pte++)
+            pt_addr[pte] = dummy_fb_page|PG_UW;
+        kunmap_atomic(pt_addr);
+    };
+
+    for(; pde < 8; pde++)
+    {
+        addr_t pt = kfb->pde[pde] & 0xFFFFF000;
+        pt_addr = kmap_atomic((struct page*)pt);
+        for(pte = 0; pte < 1024; pte++)
+            pt_addr[pte] = dummy_fb_page|PG_UW;
+        kunmap_atomic(pt_addr);
+    }
+};
+
+void set_fake_framebuffer()
+{
+    sysSetFramebuffer(fake_fb);
+}
diff --git a/drivers/video/drm/i915/main.c b/drivers/video/drm/i915/main.c
index 9b3fa03e7f..a8bfc68aa1 100644
--- a/drivers/video/drm/i915/main.c
+++ b/drivers/video/drm/i915/main.c
@@ -14,7 +14,7 @@
 #include "bitmap.h"
 #include "i915_kos32.h"
 
-#define DRV_NAME "i915 v4.4.3"
+#define DRV_NAME "i915 v4.4.5"
 
 #define I915_DEV_CLOSE 0
 #define I915_DEV_INIT  1
@@ -254,6 +254,10 @@ u32  __attribute__((externally_visible)) drvEntry(int action, char *cmdline)
 
     dmi_scan_machine();
 
+    err = fake_framebuffer_create();
+    if( unlikely(err != 0))
+        return 0;
+
     driver_wq_state = I915_DEV_INIT;
     CreateKernelThread(i915_driver_thread);