Merge branch 'drm-fixes-mst' of git://people.freedesktop.org/~airlied/linux into drm-fixes (6739b3d7) · Commits · 戴 / test

drivers/gpu/drm/drm_dp_mst_topology.c

+182 −97

Original line number	Diff line number	Diff line
		@@ -803,12 +803,33 @@ 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
		@@ -835,7 +856,8 @@ 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)
		@@ -883,6 +905,7 @@ 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);
		@@ -1018,18 +1041,27 @@ 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, port->guid);
		port->guid_valid = true;
		16,
		mstb->guid);
		} else {

		ret = drm_dp_dpcd_write(
		mstb->mgr->aux,
		DP_GUID,
		mstb->guid,
		16);
		}
		}
		}
		@@ -1086,7 +1118,6 @@ 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 */
		@@ -1099,11 +1130,9 @@ 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;
		}
		}
		@@ -1130,13 +1159,11 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
		drm_dp_put_port(port);
		goto out;
		}
		if (port->port_num >= DP_MST_LOGICAL_PORT_0) {
		port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);

		drm_mode_connector_set_tile_property(port->connector);
		}

		(*mstb->mgr->cbs->register_connector)(port->connector);
		}

		out:
		/* put reference to this port */
		drm_dp_put_port(port);
		@@ -1161,11 +1188,9 @@ static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
		port->ddps = conn_stat->displayport_device_plug_status;

		if (old_ddps != port->ddps) {
		if (port->ddps) {
		drm_dp_check_port_guid(mstb, port);
		dowork = true;
		if (port->ddps) {
		} else {
		port->guid_valid = false;
		port->available_pbn = 0;
		}
		}
		@@ -1222,13 +1247,14 @@ static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
		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;

		if (port->guid_valid && memcmp(port->guid, guid, 16) == 0)
		return port->mstb;

		found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);

		if (found_mstb)
		@@ -1247,9 +1273,6 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid(
		/* find the port by iterating down */
		mutex_lock(&mgr->lock);

		if (mgr->guid_valid && memcmp(mgr->guid, guid, 16) == 0)
		mstb = mgr->mst_primary;
		else
		mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);

		if (mstb)
		@@ -1271,8 +1294,13 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m
		if (port->input)
		continue;

		if (!port->ddps)
		if (!port->ddps) {
		if (port->cached_edid) {
		kfree(port->cached_edid);
		port->cached_edid = NULL;
		}
		continue;
		}

		if (!port->available_pbn)
		drm_dp_send_enum_path_resources(mgr, mstb, port);
		@@ -1283,6 +1311,12 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m
		drm_dp_check_and_send_link_address(mgr, mstb_child);
		drm_dp_put_mst_branch_device(mstb_child);
		}
		} else if (port->pdt == DP_PEER_DEVICE_SST_SINK \|\|
		port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV) {
		if (!port->cached_edid) {
		port->cached_edid =
		drm_get_edid(port->connector, &port->aux.ddc);
		}
		}
		}
		}
		@@ -1302,6 +1336,8 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
		drm_dp_check_and_send_link_address(mgr, mstb);
		drm_dp_put_mst_branch_device(mstb);
		}

		(*mgr->cbs->hotplug)(mgr);
		}

		static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
		@@ -1555,10 +1591,12 @@ 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]);
		}
		(*mgr->cbs->hotplug)(mgr);
		}
		} else {
		mstb->link_address_sent = false;
		@@ -1602,6 +1640,37 @@ 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,
		@@ -1609,13 +1678,18 @@ 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;
		u8 sinks[DRM_DP_MAX_SDP_STREAMS];
		int i;

		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) {
		@@ -1627,7 +1701,7 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
		sinks[i] = i;

		txmsg->dst = mstb;
		len = build_allocate_payload(txmsg, port->port_num,
		len = build_allocate_payload(txmsg, port_num,
		id,
		pbn, port->num_sdp_streams, sinks);

		@@ -1983,31 +2057,17 @@ 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);
		@@ -2231,9 +2291,8 @@ static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
		}

		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);

		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);
		} else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
		drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
		if (!mstb)
		@@ -2320,10 +2379,6 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector

		case DP_PEER_DEVICE_SST_SINK:
		status = connector_status_connected;
		/* for logical ports - cache the EDID */
		if (port->port_num >= 8 && !port->cached_edid) {
		port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
		}
		break;
		case DP_PEER_DEVICE_DP_LEGACY_CONV:
		if (port->ldps)
		@@ -2378,10 +2433,7 @@ struct edid drm_dp_mst_get_edid(struct drm_connector connector, struct drm_dp_

		if (port->cached_edid)
		edid = drm_edid_duplicate(port->cached_edid);
		else {
		edid = drm_get_edid(connector, &port->aux.ddc);
		drm_mode_connector_set_tile_property(connector);
		}

		port->has_audio = drm_detect_monitor_audio(edid);
		drm_dp_put_port(port);
		return edid;
		@@ -2446,6 +2498,7 @@ 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;
		}
		}
		@@ -2605,32 +2658,31 @@ 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;

		pix_bw.full = dfixed_const(clock);
		fbpp.full = dfixed_const(bpp);
		tmp.full = dfixed_const(8);
		fbpp.full = dfixed_div(fbpp, tmp);

		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.full = dfixed_const(1006);
		tmp.full = dfixed_const(1000);
		margin.full = dfixed_div(margin, tmp);
		result.full = dfixed_mul(result, margin);

		result.full = dfixed_div(result, tmp);
		result.full = dfixed_ceil(result);
		res = dfixed_trunc(result);
		return res;
		u64 kbps;
		s64 peak_kbps;
		u32 numerator;
		u32 denominator;

		kbps = clock * bpp;

		/*
		* 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
		*/

		numerator = 64 * 1006;
		denominator = 54 * 8 * 1000 * 1000;

		kbps *= numerator;
		peak_kbps = drm_fixp_from_fraction(kbps, denominator);

		return drm_fixp2int_ceil(peak_kbps);
		}
		EXPORT_SYMBOL(drm_dp_calc_pbn_mode);

		@@ -2638,11 +2690,23 @@ 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;
		}

		@@ -2783,6 +2847,13 @@ 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);
		}

		static void drm_dp_destroy_connector_work(struct work_struct *work)
		{
		struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
		@@ -2803,13 +2874,22 @@ static void drm_dp_destroy_connector_work(struct work_struct *work)
		list_del(&port->next);
		mutex_unlock(&mgr->destroy_connector_lock);

		kref_init(&port->kref);
		INIT_LIST_HEAD(&port->next);

		mgr->cbs->destroy_connector(mgr, port->connector);

		drm_dp_port_teardown_pdt(port, port->pdt);

		if (!port->input && port->vcpi.vcpi > 0)
		if (!port->input && port->vcpi.vcpi > 0) {
		if (mgr->mst_state) {
		drm_dp_mst_reset_vcpi_slots(mgr, port);
		drm_dp_update_payload_part1(mgr);
		drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
		kfree(port);
		}
		}

		kref_put(&port->kref, drm_dp_free_mst_port);
		send_hotplug = true;
		}
		if (send_hotplug)
		@@ -2847,6 +2927,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
		mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
		mgr->max_payloads = max_payloads;
		mgr->conn_base_id = conn_base_id;
		if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 \|\|
		max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
		return -EINVAL;
		mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
		if (!mgr->payloads)
		return -ENOMEM;
		@@ -2854,7 +2937,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
		if (!mgr->proposed_vcpis)
		return -ENOMEM;
		set_bit(0, &mgr->payload_mask);
		test_calc_pbn_mode();
		if (test_calc_pbn_mode() < 0)
		DRM_ERROR("MST PBN self-test failed\n");

		return 0;
		}
		EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);

include/drm/drm_dp_mst_helper.h

+10 −15

Original line number	Diff line number	Diff line
		@@ -44,8 +44,6 @@ struct drm_dp_vcpi {
		/**
		* struct drm_dp_mst_port - MST port
		* @kref: reference count for this port.
		* @guid_valid: for DP 1.2 devices if we have validated the GUID.
		* @guid: guid for DP 1.2 device on this port.
		* @port_num: port number
		* @input: if this port is an input port.
		* @mcs: message capability status - DP 1.2 spec.
		@@ -70,10 +68,6 @@ struct drm_dp_vcpi {
		struct drm_dp_mst_port {
		struct kref kref;

		/* if dpcd 1.2 device is on this port - its GUID info */
		bool guid_valid;
		u8 guid[16];

		u8 port_num;
		bool input;
		bool mcs;
		@@ -110,10 +104,12 @@ struct drm_dp_mst_port {
		* @tx_slots: transmission slots for this device.
		* @last_seqno: last sequence number used to talk to this.
		* @link_address_sent: if a link address message has been sent to this device yet.
		* @guid: guid for DP 1.2 branch device. port under this branch can be
		* identified by port #.
		*
		* This structure represents an MST branch device, there is one
		* primary branch device at the root, along with any others connected
		* to downstream ports
		* primary branch device at the root, along with any other branches connected
		* to downstream port of parent branches.
		*/
		struct drm_dp_mst_branch {
		struct kref kref;
		@@ -132,6 +128,9 @@ struct drm_dp_mst_branch {
		struct drm_dp_sideband_msg_tx *tx_slots[2];
		int last_seqno;
		bool link_address_sent;

		/* global unique identifier to identify branch devices */
		u8 guid[16];
		};


		@@ -406,11 +405,9 @@ struct drm_dp_payload {
		* @conn_base_id: DRM connector ID this mgr is connected to.
		* @down_rep_recv: msg receiver state for down replies.
		* @up_req_recv: msg receiver state for up requests.
		* @lock: protects mst state, primary, guid, dpcd.
		* @lock: protects mst state, primary, dpcd.
		* @mst_state: if this manager is enabled for an MST capable port.
		* @mst_primary: pointer to the primary branch device.
		* @guid_valid: GUID valid for the primary branch device.
		* @guid: GUID for primary port.
		* @dpcd: cache of DPCD for primary port.
		* @pbn_div: PBN to slots divisor.
		*
		@@ -432,13 +429,11 @@ struct drm_dp_mst_topology_mgr {
		struct drm_dp_sideband_msg_rx up_req_recv;

		/* pointer to info about the initial MST device */
		struct mutex lock; /* protects mst_state + primary + guid + dpcd */
		struct mutex lock; /* protects mst_state + primary + dpcd */

		bool mst_state;
		struct drm_dp_mst_branch *mst_primary;
		/* primary MST device GUID */
		bool guid_valid;
		u8 guid[16];

		u8 dpcd[DP_RECEIVER_CAP_SIZE];
		u8 sink_count;
		int pbn_div;

include/drm/drm_fixed.h

+51 −2

Original line number	Diff line number	Diff line
		@@ -73,18 +73,28 @@ static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B)
		#define DRM_FIXED_ONE (1ULL << DRM_FIXED_POINT)
		#define DRM_FIXED_DECIMAL_MASK (DRM_FIXED_ONE - 1)
		#define DRM_FIXED_DIGITS_MASK (~DRM_FIXED_DECIMAL_MASK)
		#define DRM_FIXED_EPSILON 1LL
		#define DRM_FIXED_ALMOST_ONE (DRM_FIXED_ONE - DRM_FIXED_EPSILON)

		static inline s64 drm_int2fixp(int a)
		{
		return ((s64)a) << DRM_FIXED_POINT;
		}

		static inline int drm_fixp2int(int64_t a)
		static inline int drm_fixp2int(s64 a)
		{
		return ((s64)a) >> DRM_FIXED_POINT;
		}

		static inline unsigned drm_fixp_msbset(int64_t a)
		static inline int drm_fixp2int_ceil(s64 a)
		{
		if (a > 0)
		return drm_fixp2int(a + DRM_FIXED_ALMOST_ONE);
		else
		return drm_fixp2int(a - DRM_FIXED_ALMOST_ONE);
		}

		static inline unsigned drm_fixp_msbset(s64 a)
		{
		unsigned shift, sign = (a >> 63) & 1;

		@@ -136,6 +146,45 @@ static inline s64 drm_fixp_div(s64 a, s64 b)
		return result;
		}

		static inline s64 drm_fixp_from_fraction(s64 a, s64 b)
		{
		s64 res;
		bool a_neg = a < 0;
		bool b_neg = b < 0;
		u64 a_abs = a_neg ? -a : a;
		u64 b_abs = b_neg ? -b : b;
		u64 rem;

		/* determine integer part */
		u64 res_abs = div64_u64_rem(a_abs, b_abs, &rem);

		/* determine fractional part */
		{
		u32 i = DRM_FIXED_POINT;

		do {
		rem <<= 1;
		res_abs <<= 1;
		if (rem >= b_abs) {
		res_abs \|= 1;
		rem -= b_abs;
		}
		} while (--i != 0);
		}

		/* round up LSB */
		{
		u64 summand = (rem << 1) >= b_abs;

		res_abs += summand;
		}

		res = (s64) res_abs;
		if (a_neg ^ b_neg)
		res = -res;
		return res;
		}

		static inline s64 drm_fixp_exp(s64 x)
		{
		s64 tolerance = div64_s64(DRM_FIXED_ONE, 1000000);

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