From: Dave Airlie airlied@redhat.com
This is the initial import of the helper for displayport multistream.
It consists of a topology manager, init/destroy/set mst state
It supports DP 1.2 MST sideband msg protocol handler - via hpd irqs
connector detect and edid retrieval interface.
It supports i2c device over DP 1.2 sideband msg protocol (EDID reads only)
bandwidth manager API via vcpi allocation and payload updating, along with a helper to check the ACT status.
Objects: MST topology manager - one per toplevel MST capable GPU port - not sure if this should be higher level again MST branch unit - one instance per plugged branching unit - one at top of hierarchy - others hanging from ports MST port - one port per port reported by branching units, can have MST units hanging from them as well.
TODO: cleanup locking review fix known bug with UP message when an MST device is connected to an MST device.
Signed-off-by: Dave Airlie airlied@redhat.com --- drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_dp_mst_topology.c | 2081 +++++++++++++++++++++++++++++++++ include/drm/drm_dp_mst_helper.h | 403 +++++++ 3 files changed, 2485 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/drm_dp_mst_topology.c create mode 100644 include/drm/drm_dp_mst_helper.h
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 48e38ba..712b73e 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -23,7 +23,7 @@ drm-$(CONFIG_DRM_PANEL) += drm_panel.o
drm-usb-y := drm_usb.o
-drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o +drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o drm_dp_mst_topology.o drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o drm_kms_helper-$(CONFIG_DRM_KMS_FB_HELPER) += drm_fb_helper.o drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c new file mode 100644 index 0000000..c6a0881 --- /dev/null +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -0,0 +1,2081 @@ +/* + * Copyright © 2014 Red Hat + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/i2c.h> +#include <drm/drm_dp_mst_helper.h> +#include <drm/drmP.h> + +#include <drm/drm_fixed.h> + +static int test_calc_pbn_mode(void); + +static void drm_dp_put_port(struct drm_dp_mst_port *port); + +static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, + struct drm_dp_sideband_msg_tx *raw); +static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg); +static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + int port_num); + +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, + int id, + struct drm_dp_payload *payload); + +#if 0 +static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size); +#endif + +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size, u8 *bytes); + +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb); +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, + u8 *guid); + +static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, + struct drm_dp_sideband_msg_tx *txmsg) +{ + struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; + int ret; + + ret = wait_event_timeout(mgr->tx_waitq, + (txmsg->state == DRM_DP_SIDEBAND_TX_RX || + txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT), + (4 * HZ)); + if (ret > 0) { + if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { + ret = -EIO; + goto out; + } + } else { + DRM_DEBUG_KMS("timedout msg send %p %d\n", txmsg, txmsg->state); + /* remove from q */ + if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || + txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { + mutex_lock(&mgr->lock); + list_del(&txmsg->next); + mutex_unlock(&mgr->lock); + } + + if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || + txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { + spin_lock(&mstb->slots_lock); + mstb->tx_slots[txmsg->seqno] = NULL; + spin_unlock(&mstb->slots_lock); + } + } +out: + return ret; +} +static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, + int num) +{ + struct drm_dp_aux *aux = adapter->algo_data; + struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); + struct drm_dp_mst_branch *mstb = port->parent; + struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; + unsigned int i; + bool reading = false; + struct drm_dp_sideband_msg_req_body msg; + struct drm_dp_sideband_msg_tx *txmsg = NULL; + int ret; + /* construct i2c msg */ + /* see if last msg is a read */ + if (msgs[num - 1].flags & I2C_M_RD) + reading = true; + + if (!reading) { + DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); + ret = -EIO; + goto out; + } + + msg.req_type = DP_REMOTE_I2C_READ; + msg.u.i2c_read.num_transactions = num - 1; + msg.u.i2c_read.port_number = port->port_num; + for (i = 0; i < num - 1; i++) { + msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; + msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; + memcpy(&msg.u.i2c_read.transactions[i].bytes, msgs[i].buf, msgs[i].len); + } + msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; + msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) { + ret = -ENOMEM; + goto out; + } + + txmsg->dst = mstb; + drm_dp_encode_sideband_req(&msg, txmsg); + + mutex_lock(&mgr->lock); + drm_dp_queue_down_tx(mgr, txmsg); + mutex_unlock(&mgr->lock); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + + if (txmsg->reply.reply_type == 1) { /* got a NAK back */ + ret = -EIO; + goto out; + } + if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { + ret = -EIO; + goto out; + } + memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); + ret = num; + } +out: + kfree(txmsg); + return ret; +} + +static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | + I2C_FUNC_SMBUS_READ_BLOCK_DATA | + I2C_FUNC_SMBUS_BLOCK_PROC_CALL | + I2C_FUNC_10BIT_ADDR; +} + +static const struct i2c_algorithm drm_dp_mst_i2c_algo = { + .functionality = drm_dp_mst_i2c_functionality, + .master_xfer = drm_dp_mst_i2c_xfer, +}; + +/** + * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX + * @aux: DisplayPort AUX channel + * + * Returns 0 on success or a negative error code on failure. + */ +static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) +{ + aux->ddc.algo = &drm_dp_mst_i2c_algo; + aux->ddc.algo_data = aux; + aux->ddc.retries = 3; + + aux->ddc.class = I2C_CLASS_DDC; + aux->ddc.owner = THIS_MODULE; + aux->ddc.dev.parent = aux->dev; + aux->ddc.dev.of_node = aux->dev->of_node; + + strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), + sizeof(aux->ddc.name)); + + return i2c_add_adapter(&aux->ddc); +} + +/** + * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter + * @aux: DisplayPort AUX channel + */ +void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) +{ + i2c_del_adapter(&aux->ddc); +} + +static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) +{ + struct drm_dp_mst_branch *mstb; + + mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); + if (!mstb) + return NULL; + + mstb->lct = lct; + if (lct > 1) + memcpy(mstb->rad, rad, lct / 2); + INIT_LIST_HEAD(&mstb->ports); + spin_lock_init(&mstb->slots_lock); + kref_init(&mstb->kref); + return 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; + /* destroy all ports */ + list_for_each_entry_safe(port, tmp, &mstb->ports, next) { + drm_dp_put_port(port); + } + + /* drop any tx slots msg */ + spin_lock(&mstb->slots_lock); + if (mstb->tx_slots[0]) { + mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; + mstb->tx_slots[0] = NULL; + wake_tx = true; + } + if (mstb->tx_slots[1]) { + mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; + mstb->tx_slots[1] = NULL; + wake_tx = true; + } + spin_unlock(&mstb->slots_lock); + + if (wake_tx) + wake_up(&mstb->mgr->tx_waitq); + kfree(mstb); +} + +static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) +{ + kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); +} + +static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, int force) +{ + int ret; + + if (force == -1) { + ret = find_first_zero_bit(&mgr->payload_mask, DP_MAX_PAYLOAD); + if (ret > mgr->max_payloads) { + DRM_DEBUG_KMS("out of payload ids %d\n", ret); + return -EINVAL; + } + } else + ret = force; + + set_bit(ret, &mgr->payload_mask); + return ret; +} + +static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, + int id) +{ + clear_bit(id, &mgr->payload_mask); + mgr->proposed_vcpis[id] = NULL; +} + +static void drm_dp_destroy_port(struct kref *kref) +{ + struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); + + if (port->connector) + (*port->parent->mgr->cbs->destroy_connector)(port->parent->mgr, port->connector); + drm_dp_mst_unregister_i2c_bus(&port->aux); + if (port->mstb) + drm_dp_put_mst_branch_device(port->mstb); + list_del(&port->next); + kfree(port); +} + +static void drm_dp_put_port(struct drm_dp_mst_port *port) +{ + kref_put(&port->kref, drm_dp_destroy_port); +} + +static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) +{ + struct drm_dp_mst_port *port; + + list_for_each_entry(port, &mstb->ports, next) { + if (port->port_num == port_num) { + kref_get(&port->kref); + return port; + } + } + + return NULL; +} + +static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) +{ + switch (old_pdt) { + case DP_PEER_DEVICE_DP_LEGACY_CONV: + case DP_PEER_DEVICE_SST_SINK: + /* remove i2c over sideband */ + drm_dp_mst_unregister_i2c_bus(&port->aux); + break; + case DP_PEER_DEVICE_MST_BRANCHING: + drm_dp_put_mst_branch_device(port->mstb); + port->mstb = NULL; + break; + } +} + +/* + * calculate a new RAD for this MST branch device + * if parent has an LCT of 2 then it has 1 nibble of RAD, + * if parent has an LCT of 3 then it has 2 nibbles of RAD, + */ +static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, + u8 *rad) +{ + int 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; + } else + rad[0] = 0; + + rad[idx] |= port->port_num << shift; + return lct + 1; +} + +static void drm_dp_port_setup_pdt(struct drm_dp_mst_port *port, u8 *guid) +{ + int ret; + u8 rad[6], lct; + + switch (port->pdt) { + case DP_PEER_DEVICE_DP_LEGACY_CONV: + case DP_PEER_DEVICE_SST_SINK: + /* add i2c over sideband */ + ret = drm_dp_mst_register_i2c_bus(&port->aux); + break; + case DP_PEER_DEVICE_MST_BRANCHING: + lct = drm_dp_calculate_rad(port, rad); + + port->mstb = drm_dp_add_mst_branch_device(lct, rad); + port->mstb->mgr = port->parent->mgr; + port->mstb->parent_is_port = true; + port->mstb->port_parent = port; + + drm_dp_send_link_address(port->parent->mgr, port->mstb); + + break; + } +} + +static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, + struct device *dev, + struct drm_dp_link_addr_reply_port *port_msg) +{ + struct drm_dp_mst_port *port; + int ret; + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return; + + kref_init(&port->kref); + port->parent = mstb; + port->port_num = port_msg->port_number; + port->pdt = port_msg->peer_device_type; + port->input = port_msg->input_port; + port->mcs = port_msg->mcs; + port->ddps = port_msg->ddps; + port->ldps = port_msg->legacy_device_plug_status; + port->dpcd_rev = port_msg->dpcd_revision; + memcpy(port->guid, port_msg->peer_guid, 16); + list_add(&port->next, &mstb->ports); + + port->aux.name = "DPMST"; + port->aux.dev = dev; + + if (port->ddps) { + 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, + DP_GUID, + 16, port->guid); + port->guid_valid = true; + } + } + } + if (!port->input && port->ddps) + drm_dp_port_setup_pdt(port, port_msg->peer_guid); + + if (!port->input && port->ddps) + drm_dp_send_enum_path_resources(mstb->mgr, mstb, + port->port_num); + + if (!port->input) + port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port); + +} + +static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, + struct drm_dp_connection_status_notify *conn_stat) +{ + struct drm_dp_mst_port *port; + int old_pdt; + port = drm_dp_get_port(mstb, conn_stat->port_number); + if (!port) + return; + + old_pdt = port->pdt; + port->pdt = conn_stat->peer_device_type; + port->mcs = conn_stat->message_capability_status; + port->ldps = conn_stat->legacy_device_plug_status; + port->ddps = conn_stat->displayport_device_plug_status; + + if (old_pdt != port->pdt) { + drm_dp_port_teardown_pdt(port, old_pdt); + drm_dp_port_setup_pdt(port, conn_stat->guid); + } + + if (!port->input && port->ddps) + drm_dp_send_enum_path_resources(mstb->mgr, mstb, + port->port_num); + + drm_dp_put_port(port); +} + +static void drm_dp_update_port_pbn(struct drm_dp_mst_branch *mstb, + uint8_t port_number, + uint16_t available_pbn) +{ + struct drm_dp_mst_port *port; + + port = drm_dp_get_port(mstb, port_number); + if (!port) + return; + + port->available_pbn = available_pbn; + drm_dp_put_port(port); +} + +static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, + u8 lct, u8 *rad) +{ + struct drm_dp_mst_branch *mstb; + struct drm_dp_mst_port *port; + int i; + /* find the port by iterating down */ + mstb = mgr->mst_primary; + + for (i = 0; i < lct - 1; i++) { + int shift = (i % 2) ? 0 : 4; + int port_num = rad[i / 2] >> shift; + + list_for_each_entry(port, &mstb->ports, next) { + if (port->port_num == port_num) { + if (!port->mstb) { + DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); + return NULL; + } + + mstb = port->mstb; + break; + } + } + } + kref_get(&mstb->kref); + return mstb; +} + +static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) +{ + u8 bitmask = 0x80; + u8 bitshift = 7; + u8 array_index = 0; + int number_of_bits = num_nibbles * 4; + u8 remainder = 0; + + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + remainder |= (data[array_index] & bitmask) >> bitshift; + bitmask >>= 1; + bitshift--; + if (bitmask == 0) { + bitmask = 0x80; + bitshift = 7; + array_index++; + } + if ((remainder & 0x10) == 0x10) + remainder ^= 0x13; + } + + number_of_bits = 4; + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + if ((remainder & 0x10) != 0) + remainder ^= 0x13; + } + + return remainder; +} + +static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) +{ + u8 bitmask = 0x80; + u8 bitshift = 7; + u8 array_index = 0; + int number_of_bits = number_of_bytes * 8; + u16 remainder = 0; + + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + remainder |= (data[array_index] & bitmask) >> bitshift; + bitmask >>= 1; + bitshift--; + if (bitmask == 0) { + bitmask = 0x80; + bitshift = 7; + array_index++; + } + if ((remainder & 0x100) == 0x100) + remainder ^= 0xd5; + } + + number_of_bits = 8; + while (number_of_bits != 0) { + number_of_bits--; + remainder <<= 1; + if ((remainder & 0x100) != 0) + remainder ^= 0xd5; + } + + return remainder & 0xff; +} + +static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) +{ + u8 size = 3; + size += (hdr->lct / 2); + return size; +} + +static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, + u8 *buf, int *len) +{ + int idx = 0; + int i; + u8 crc4; + buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); + for (i = 0; i < (hdr->lct / 2); i++) + buf[idx++] = hdr->rad[i]; + buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | + (hdr->msg_len & 0x3f); + buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); + + crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); + buf[idx - 1] |= (crc4 & 0xf); + + *len = idx; +} + +static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, + u8 *buf, int buflen, u8 *hdrlen) +{ + u8 crc4; + u8 len; + int i; + u8 idx; + if (buf[0] == 0) + return false; + len = 3; + len += ((buf[0] & 0xf0) >> 4) / 2; + if (len > buflen) + return false; + crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); + + if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { + DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); + return false; + } + + hdr->lct = (buf[0] & 0xf0) >> 4; + hdr->lcr = (buf[0] & 0xf); + idx = 1; + for (i = 0; i < (hdr->lct / 2); i++) + hdr->rad[i] = buf[idx++]; + hdr->broadcast = (buf[idx] >> 7) & 0x1; + hdr->path_msg = (buf[idx] >> 6) & 0x1; + hdr->msg_len = buf[idx] & 0x3f; + idx++; + hdr->somt = (buf[idx] >> 7) & 0x1; + hdr->eomt = (buf[idx] >> 6) & 0x1; + hdr->seqno = (buf[idx] >> 4) & 0x1; + idx++; + *hdrlen = idx; + return true; +} + +static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, + struct drm_dp_sideband_msg_tx *raw) +{ + int idx = 0; + int i; + u8 *buf = raw->msg; + buf[idx++] = req->req_type & 0x7f; + + switch (req->req_type) { + case DP_ENUM_PATH_RESOURCES: + buf[idx] = (req->u.port_num.port_number & 0xf) << 4; + idx++; + break; + case DP_ALLOCATE_PAYLOAD: + buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | + (req->u.allocate_payload.number_sdp_streams & 0xf); + idx++; + buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); + idx++; + buf[idx] = (req->u.allocate_payload.pbn >> 8); + idx++; + buf[idx] = (req->u.allocate_payload.pbn & 0xff); + idx++; + for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { + buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | + (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); + idx++; + } + if (req->u.allocate_payload.number_sdp_streams & 1) { + i = req->u.allocate_payload.number_sdp_streams - 1; + buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; + idx++; + } + break; + case DP_QUERY_PAYLOAD: + buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; + idx++; + buf[idx] = (req->u.query_payload.vcpi & 0x7f); + idx++; + break; + case DP_REMOTE_DPCD_READ: + buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; + buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; + idx++; + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; + idx++; + buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); + idx++; + buf[idx] = (req->u.dpcd_read.num_bytes); + idx++; + break; + + case DP_REMOTE_DPCD_WRITE: + buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; + buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; + idx++; + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; + idx++; + buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); + idx++; + buf[idx] = (req->u.dpcd_write.num_bytes); + idx++; + memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); + idx += req->u.dpcd_write.num_bytes; + break; + case DP_REMOTE_I2C_READ: + buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; + buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); + idx++; + for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { + buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; + idx++; + buf[idx] = req->u.i2c_read.transactions[i].num_bytes; + idx++; + memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); + idx += req->u.i2c_read.transactions[i].num_bytes; + + buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; + buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); + idx++; + } + buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; + idx++; + buf[idx] = (req->u.i2c_read.num_bytes_read); + idx++; + break; + + case DP_REMOTE_I2C_WRITE: + buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; + idx++; + buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; + idx++; + buf[idx] = (req->u.i2c_write.num_bytes); + idx++; + memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); + idx += req->u.i2c_write.num_bytes; + break; + } + raw->cur_len = idx; +} + +static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) +{ + u8 crc4; + crc4 = drm_dp_msg_data_crc4(msg, len); + msg[len] = crc4; +} + +static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, + struct drm_dp_sideband_msg_tx *raw) +{ + int idx = 0; + u8 *buf = raw->msg; + + buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); + + raw->cur_len = idx; +} + +/* this adds a chunk of msg to the builder to get the final msg */ +static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, + u8 *replybuf, u8 replybuflen, bool hdr) +{ + int ret; + u8 crc4; + + if (hdr) { + u8 hdrlen; + struct drm_dp_sideband_msg_hdr recv_hdr; + ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); + if (ret == false) + return false; + + /* get length contained in this portion */ + msg->curchunk_len = recv_hdr.msg_len; + msg->curchunk_hdrlen = hdrlen; + + /* we have already gotten an somt - don't bother parsing */ + if (recv_hdr.somt && msg->have_somt) + return false; + + if (recv_hdr.somt) { + memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); + msg->have_somt = true; + } + if (recv_hdr.eomt) + msg->have_eomt = true; + + /* copy the bytes for the remainder of this header chunk */ + msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); + memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); + } else { + memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); + msg->curchunk_idx += replybuflen; + } + + if (msg->curchunk_idx >= msg->curchunk_len) { + /* do CRC */ + crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); + /* copy chunk into bigger msg */ + memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); + msg->curlen += msg->curchunk_len - 1; + } + return true; +} + +static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + int i; + memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); + idx += 16; + repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + for (i = 0; i < repmsg->u.link_addr.nports; i++) { + if (raw->msg[idx] & 0x80) + repmsg->u.link_addr.ports[i].input_port = 1; + + repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; + repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); + + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; + repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; + if (repmsg->u.link_addr.ports[i].input_port == 0) + repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; + idx++; + if (idx > raw->curlen) + goto fail_len; + if (repmsg->u.link_addr.ports[i].input_port == 0) { + repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); + idx++; + if (idx > raw->curlen) + goto fail_len; + memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; + repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); + idx++; + + } + if (idx > raw->curlen) + goto fail_len; + } + + return true; +fail_len: + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; + if (idx > raw->curlen) + goto fail_len; + + memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); + return true; +fail_len: + DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + + repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; + idx++; + /* TODO check */ + memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); + return true; +fail_len: + DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.allocate_payload.vcpi = raw->msg[idx]; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *repmsg) +{ + int idx = 1; + repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; + idx++; + if (idx > raw->curlen) + goto fail_len; + repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); + idx += 2; + if (idx > raw->curlen) + goto fail_len; + return true; +fail_len: + DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_reply_body *msg) +{ + memset(msg, 0, sizeof(*msg)); + msg->reply_type = (raw->msg[0] & 0x80) >> 7; + msg->req_type = (raw->msg[0] & 0x7f); + + if (msg->reply_type) { + memcpy(msg->u.nak.guid, &raw->msg[1], 16); + msg->u.nak.reason = raw->msg[17]; + msg->u.nak.nak_data = raw->msg[18]; + return false; + } + + switch (msg->req_type) { + case DP_LINK_ADDRESS: + return drm_dp_sideband_parse_link_address(raw, msg); + case DP_QUERY_PAYLOAD: + return drm_dp_sideband_parse_query_payload_ack(raw, msg); + case DP_REMOTE_DPCD_READ: + return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); + case DP_REMOTE_DPCD_WRITE: + return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); + case DP_REMOTE_I2C_READ: + return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); + case DP_ENUM_PATH_RESOURCES: + return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); + case DP_ALLOCATE_PAYLOAD: + return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); + default: + DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); + return false; + } +} + +static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + int idx = 1; + + msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; + idx++; + if (idx > raw->curlen) + goto fail_len; + + memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + + msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; + msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; + msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; + msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; + msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); + idx++; + return true; +fail_len: + DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} + +static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + int idx = 1; + + msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; + idx++; + if (idx > raw->curlen) + goto fail_len; + + memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); + idx += 16; + if (idx > raw->curlen) + goto fail_len; + + msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); + idx++; + return true; +fail_len: + DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); + return false; +} +static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, + struct drm_dp_sideband_msg_req_body *msg) +{ + memset(msg, 0, sizeof(*msg)); + msg->req_type = (raw->msg[0] & 0x7f); + + switch (msg->req_type) { + case DP_CONNECTION_STATUS_NOTIFY: + return drm_dp_sideband_parse_connection_status_notify(raw, msg); + case DP_RESOURCE_STATUS_NOTIFY: + return drm_dp_sideband_parse_resource_status_notify(raw, msg); + default: + DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); + return false; + } +} + +static void drm_dp_mst_link_probe_work(struct work_struct *work) +{ + struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); + + drm_dp_send_link_address(mgr, mgr->mst_primary); +} + +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, + struct device *dev, struct drm_dp_aux *aux, + int max_dpcd_transaction_bytes, + int max_payloads) +{ + mutex_init(&mgr->lock); + spin_lock_init(&mgr->qlock); + INIT_LIST_HEAD(&mgr->tx_msg_upq); + INIT_LIST_HEAD(&mgr->tx_msg_downq); + INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); + init_waitqueue_head(&mgr->tx_waitq); + mgr->dev = dev; + mgr->aux = aux; + mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; + mgr->max_payloads = max_payloads; + mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); + if (!mgr->payloads) + return -ENOMEM; + mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); + if (!mgr->proposed_vcpis) + return -ENOMEM; + set_bit(0, &mgr->payload_mask); + test_calc_pbn_mode(); + return 0; +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); + +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) +{ + kfree(mgr->payloads); + kfree(mgr->proposed_vcpis); +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); + +/* this is pretty bogus */ +static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, + u8 *guid) +{ + static u8 zero_guid[16]; + + if (!memcmp(guid, zero_guid, 16)) { + u64 salt = get_jiffies_64(); + memcpy(&guid[0], &salt, sizeof(u64)); + memcpy(&guid[8], &salt, sizeof(u64)); + return false; + } + return true; +} + +#if 0 +static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_REMOTE_DPCD_READ; + req.u.dpcd_read.port_number = port_num; + req.u.dpcd_read.dpcd_address = offset; + req.u.dpcd_read.num_bytes = num_bytes; + drm_dp_encode_sideband_req(&req, msg); + + return 0; +} +#endif + +static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_REMOTE_DPCD_WRITE; + req.u.dpcd_write.port_number = port_num; + req.u.dpcd_write.dpcd_address = offset; + req.u.dpcd_write.num_bytes = num_bytes; + memcpy(req.u.dpcd_write.bytes, bytes, num_bytes); + drm_dp_encode_sideband_req(&req, msg); + + return 0; +} + +static int build_link_address(struct drm_dp_sideband_msg_tx *msg) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_LINK_ADDRESS; + drm_dp_encode_sideband_req(&req, msg); + return 0; +} + +static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) +{ + struct drm_dp_sideband_msg_req_body req; + + req.req_type = DP_ENUM_PATH_RESOURCES; + req.u.port_num.port_number = port_num; + drm_dp_encode_sideband_req(&req, msg); + return 0; +} + +static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, + u8 vcpi, uint16_t pbn) +{ + struct drm_dp_sideband_msg_req_body req; + memset(&req, 0, sizeof(req)); + req.req_type = DP_ALLOCATE_PAYLOAD; + req.u.allocate_payload.port_number = port_num; + req.u.allocate_payload.vcpi = vcpi; + req.u.allocate_payload.pbn = pbn; + drm_dp_encode_sideband_req(&req, msg); + return 0; +} + +static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, + bool up, u8 *msg, int len) +{ + int ret; + int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; + int tosend, total, offset; + + total = len; + offset = 0; + do { + tosend = min3(mgr->max_dpcd_transaction_bytes, 32, total); + + ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, + &msg[offset], + tosend); + offset += tosend; + total -= tosend; + } while (total > 0); + return ret; +} + +static int set_hdr_from_dst(struct drm_dp_sideband_msg_hdr *hdr, + struct drm_dp_sideband_msg_tx *txmsg) +{ + struct drm_dp_mst_branch *mstb = txmsg->dst; + + /* both msg slots are full */ + if (txmsg->seqno == -1) { + spin_lock(&mstb->slots_lock); + if (mstb->tx_slots[0] && mstb->tx_slots[1]) { + DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); + spin_unlock(&mstb->slots_lock); + return -EAGAIN; + } + if (mstb->tx_slots[0] == NULL) + txmsg->seqno = 0; + else + txmsg->seqno = 1; + mstb->tx_slots[txmsg->seqno] = txmsg; + spin_unlock(&mstb->slots_lock); + } + hdr->broadcast = 0; + hdr->path_msg = 0; + hdr->lct = mstb->lct; + hdr->lcr = mstb->lct - 1; + if (mstb->lct > 1) + memcpy(hdr->rad, mstb->rad, mstb->lct / 2); + hdr->seqno = txmsg->seqno; + return 0; +} +/* + * process a single block of the next message in the sideband queue + */ +static int process_single_tx(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg, + bool up) +{ + u8 chunk[48]; + struct drm_dp_sideband_msg_hdr hdr; + int len, space, idx, tosend; + int ret; + + /* make hdr from dst mst - for replies use seqno + otherwise assign one */ + ret = set_hdr_from_dst(&hdr, txmsg); + if (ret < 0) + return ret; + + txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; + + /* amount left to send in this message */ + len = txmsg->cur_len - txmsg->cur_offset; + + /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ + space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); + + tosend = min(len, space); + if (len == txmsg->cur_len) + hdr.somt = 1; + if (space >= len) + hdr.eomt = 1; + + hdr.msg_len = tosend + 1; + drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); + memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); + /* add crc at end */ + drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); + idx += tosend + 1; + drm_dp_send_sideband_msg(mgr, up, chunk, idx); + + txmsg->cur_offset += tosend; + if (txmsg->cur_offset == txmsg->cur_len) { + txmsg->state = DRM_DP_SIDEBAND_TX_SENT; + return 1; + } + return 0; +} + +static void process_single_down_tx(struct drm_dp_mst_topology_mgr *mgr) +{ + 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_downq)) { + mgr->tx_down_in_progress = false; + return; + } + + txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); + txmsg->seqno = -1; + ret = process_single_tx(mgr, txmsg, false); + if (ret == 1) { + /* txmsg is sent it should be in the slots now */ + list_del(&txmsg->next); + } + mgr->tx_down_in_progress = true; +} + +static void process_single_up_tx(struct drm_dp_mst_topology_mgr *mgr) +{ + 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(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); + } + mgr->tx_up_in_progress = true; +} + +static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_sideband_msg_tx *txmsg) +{ + list_add_tail(&txmsg->next, &mgr->tx_msg_downq); + if (!mgr->tx_down_in_progress) + process_single_down_tx(mgr); + +} + +static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + int ret; + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + len = build_link_address(txmsg); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + int i; + + if (txmsg->reply.reply_type == 1) + DRM_DEBUG_KMS("link address nak received\n"); + else { + DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); + for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { + DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d\n", i, + txmsg->reply.u.link_addr.ports[i].input_port, + txmsg->reply.u.link_addr.ports[i].peer_device_type, + txmsg->reply.u.link_addr.ports[i].port_number, + txmsg->reply.u.link_addr.ports[i].dpcd_revision, + txmsg->reply.u.link_addr.ports[i].mcs, + txmsg->reply.u.link_addr.ports[i].ddps, + txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status); + } + 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]); + } + } + } else + DRM_DEBUG_KMS("link address failed %d\n", ret); + + kfree(txmsg); + return 0; +} + +static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + int port_num) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + + /* TODO redo this properly */ + return 0; + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + len = build_enum_path_resources(txmsg, port_num); + + drm_dp_queue_down_tx(mgr, txmsg); + + return 0; +} + +int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + int pbn) +{ + struct drm_dp_sideband_msg_tx *txmsg; + int len, ret; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = port->parent; + len = build_allocate_payload(txmsg, port->port_num, + id, + pbn); + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); + + kfree(txmsg); + return 0; +} + +static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, + int id, + struct drm_dp_payload *payload) +{ + int ret; + + ret = drm_dp_dpcd_write_payload(mgr, id, payload); + if (ret < 0) + return ret; + payload->payload_state = DP_PAYLOAD_LOCAL; + return 0; +} + +int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + struct drm_dp_payload *payload) +{ + int ret; + ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); + if (ret < 0) + return ret; + payload->payload_state = DP_PAYLOAD_REMOTE; + return ret; +} + +int drm_dp_destroy_payload(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int id, + struct drm_dp_payload *payload) +{ + int ret; + if (port) + ret = drm_dp_payload_send_msg(mgr, port, id, 0); + + ret = drm_dp_dpcd_write_payload(mgr, id, payload); + + (*mgr->cbs->generate_act_event)(mgr); + + ret = drm_dp_check_act_status(mgr); + payload->payload_state = 0; + return ret; +} + +/* see if we need to change and of the payload allocations */ +/* it appears for intel we should set the whole mode up between + sending the remote payload setup and configuring the local dpcd table */ +/* return 1 if things changed so ACT can be sent */ +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) +{ + int i; + int cur_slots = 1; + struct drm_dp_payload req_payload; + + for (i = 0; i < mgr->max_payloads; i++) { + /* solve the current payloads - compare to the hw ones + - update the hw view */ + req_payload.start_slot = cur_slots; + if (mgr->proposed_vcpis[i]) + req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; + else + req_payload.num_slots = 0; + + /* work out what is required to happen with this payload */ + if (mgr->payloads[i].start_slot != req_payload.start_slot || + mgr->payloads[i].num_slots != req_payload.num_slots) { + struct drm_dp_mst_port *port = NULL; + + if (mgr->proposed_vcpis[i]) + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); + + /* need to push an update for this payload */ + if (req_payload.num_slots) + drm_dp_create_payload_step1(mgr, i, &req_payload); + else if (mgr->payloads[i].num_slots) { + mgr->payloads[i].num_slots = 0; + drm_dp_destroy_payload(mgr, port, i, &mgr->payloads[i]); + } + mgr->payloads[i].start_slot = req_payload.start_slot; + mgr->payloads[i].num_slots = req_payload.num_slots; + mgr->payloads[i].payload_state = req_payload.payload_state; + } + cur_slots += req_payload.num_slots; + } + + return 0; +} +EXPORT_SYMBOL(drm_dp_update_payload_part1); + +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) +{ + struct drm_dp_mst_port *port; + int i; + int ret; + for (i = 0; i < mgr->max_payloads; i++) { + if (!mgr->proposed_vcpis[i]) + continue; + + if (mgr->payloads[i].payload_state != DP_PAYLOAD_LOCAL) + continue; + + port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); + ret = drm_dp_create_payload_step2(mgr, port, i, &mgr->payloads[i]); + } + return 0; +} +EXPORT_SYMBOL(drm_dp_update_payload_part2); + +#if 0 /* unused as of yet */ +static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size) +{ + int len; + struct drm_dp_sideband_msg_tx *txmsg; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + len = build_dpcd_read(txmsg, port->port_num, 0, 8); + txmsg->dst = port->parent; + + drm_dp_queue_down_tx(mgr, txmsg); + + return 0; +} +#endif + +static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port, + int offset, int size, u8 *bytes) +{ + int len; + int ret; + struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_mst_branch *mstb = port->parent; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); + txmsg->dst = port->parent; + + drm_dp_queue_down_tx(mgr, txmsg); + + ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); + if (ret > 0) { + if (txmsg->reply.reply_type == 1) { + return -EINVAL; + } else + return 0; + } + kfree(txmsg); + return 0; +} + +static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) +{ + struct drm_dp_sideband_msg_reply_body reply; + + reply.reply_type = 1; + reply.req_type = req_type; + drm_dp_encode_sideband_reply(&reply, msg); + return 0; +} + +static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_branch *mstb, + int req_type, int seqno, bool broadcast) +{ + struct drm_dp_sideband_msg_tx *txmsg; + + txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); + if (!txmsg) + return -ENOMEM; + + txmsg->dst = mstb; + txmsg->seqno = seqno; + drm_dp_encode_up_ack_reply(txmsg, req_type); + + list_add_tail(&txmsg->next, &mgr->tx_msg_upq); + if (!mgr->tx_up_in_progress) { + process_single_up_tx(mgr); + } + return 0; +} + +static int drm_dp_get_vc_payload_bw(int dp_link_bw, int dp_link_count) +{ + switch (dp_link_bw) { + case DP_LINK_BW_1_62: + return 3 * dp_link_count; + case DP_LINK_BW_2_7: + return 5 * dp_link_count; + case DP_LINK_BW_5_4: + return 10 * dp_link_count; + } + return 0; +} + +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) +{ + int ret = 0; + + mutex_lock(&mgr->lock); + if (mst_state == mgr->mst_state) + goto out_unlock; + + mgr->mst_state = mst_state; + /* set the device into MST mode */ + if (mst_state) { + struct drm_dp_mst_branch *mstb; + WARN_ON(mgr->mst_primary); + + /* get dpcd info */ + ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); + if (ret != DP_RECEIVER_CAP_SIZE) { + DRM_DEBUG_KMS("failed to read DPCD\n"); + goto out_unlock; + } + + mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr->dpcd[1], mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK); + mgr->total_pbn = 2560; + mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); + mgr->avail_slots = mgr->total_slots; + + /* add initial branch device at LCT 1 */ + mstb = drm_dp_add_mst_branch_device(1, NULL); + if (mstb == NULL) { + ret = -ENOMEM; + goto out_unlock; + } + mstb->mgr = mgr; + /* give this the main reference */ + 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; + } + + mutex_unlock(&mgr->lock); + + schedule_work(&mgr->work); + /* we need to send the link address in a work queue + so we can avoid recusing the modeset locks if we get + new connectors */ + drm_dp_put_mst_branch_device(mgr->mst_primary); + + ret = 0; + } else { + if (mgr->mst_primary) { + cancel_work_sync(&mgr->work); + drm_dp_put_mst_branch_device(mgr->mst_primary); + mgr->mst_primary = NULL; + } + /* disable MST on the device */ + ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); + if (ret < 0) + goto out_unlock; + ret = 0; + mutex_unlock(&mgr->lock); + } + + return 0; +out_unlock: + mutex_unlock(&mgr->lock); + return ret; +} +EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); + +static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) +{ + int len; + u8 replyblock[32]; + int replylen, origlen, curreply; + int ret; + struct drm_dp_sideband_msg_rx *msg; + int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; + if (up) + msg = &mgr->up_req_recv; + else + msg = &mgr->down_rep_recv; + + len = min(mgr->max_dpcd_transaction_bytes, 32); + ret = drm_dp_dpcd_read(mgr->aux, basereg, + replyblock, len); + if (ret != len) { + DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); + return; + } + ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); + if (!ret) { + DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); + return; + } + replylen = msg->curchunk_len + msg->curchunk_hdrlen; + + origlen = replylen; + replylen -= len; + curreply = len; + while (replylen > 0) { + len = min3(replylen, mgr->max_dpcd_transaction_bytes, 32); + ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, + replyblock, len); + + drm_dp_sideband_msg_build(msg, replyblock, len, false); + curreply += len; + replylen -= len; + } +} + +static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) +{ + int ret = 0; + drm_dp_get_one_sb_msg(mgr, false); + + if (mgr->down_rep_recv.have_eomt) { + struct drm_dp_sideband_msg_tx *txmsg; + struct drm_dp_mst_branch *mstb; + + mstb = drm_dp_get_mst_branch_device(mgr, + mgr->down_rep_recv.initial_hdr.lct, + mgr->down_rep_recv.initial_hdr.rad); + + if (!mstb) { + DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + return 0; + } + + /* find the message */ + spin_lock(&mstb->slots_lock); + txmsg = mstb->tx_slots[mgr->down_rep_recv.initial_hdr.seqno]; + /* remove from slots */ + mstb->tx_slots[mgr->down_rep_recv.initial_hdr.seqno] = NULL; + spin_unlock(&mstb->slots_lock); + + if (!txmsg) { + DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x\n", + mstb, + mgr->down_rep_recv.initial_hdr.seqno, + mgr->down_rep_recv.initial_hdr.lct, + mgr->down_rep_recv.initial_hdr.rad[0]); + drm_dp_put_mst_branch_device(mstb); + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + return 0; + } + + drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); + if (txmsg->reply.reply_type == 1) { + DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); + } else if (txmsg->reply.req_type == DP_ENUM_PATH_RESOURCES) { + drm_dp_update_port_pbn(mstb, txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.avail_payload_bw_number); + } + + drm_dp_put_mst_branch_device(mstb); + + memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + txmsg->state = DRM_DP_SIDEBAND_TX_RX; + + process_single_down_tx(mgr); + + wake_up(&mgr->tx_waitq); + } + return ret; +} + +static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) +{ + int ret = 0; + drm_dp_get_one_sb_msg(mgr, true); + + if (mgr->up_req_recv.have_eomt) { + struct drm_dp_sideband_msg_req_body msg; + struct drm_dp_mst_branch *mstb; + bool seqno; + mstb = drm_dp_get_mst_branch_device(mgr, + mgr->up_req_recv.initial_hdr.lct, + mgr->up_req_recv.initial_hdr.rad); + 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; + } + + 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_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); + ret = 1; + } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { + drm_dp_send_up_ack_reply(mgr, mstb, msg.req_type, seqno, false); + DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); + } + + drm_dp_put_mst_branch_device(mstb); + memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); + } + return ret; +} + +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, int irq_vector) +{ + int ack_value = 0; + int ret = 0; + mutex_lock(&mgr->lock); + + if (irq_vector & DP_DOWN_REP_MSG_RDY) { + ret = drm_dp_mst_handle_down_rep(mgr); + ack_value |= DP_DOWN_REP_MSG_RDY; + } + + if (irq_vector & DP_UP_REQ_MSG_RDY) { + ret |= drm_dp_mst_handle_up_req(mgr); + ack_value |= DP_UP_REQ_MSG_RDY; + } + + drm_dp_dpcd_writeb(mgr->aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, + ack_value); + + mutex_unlock(&mgr->lock); + return ret; +} +EXPORT_SYMBOL(drm_dp_mst_hpd_irq); + +/* HACKS */ +enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + enum drm_connector_status status = connector_status_disconnected; + + if (!port->ddps) + goto out; + + switch (port->pdt) { + case DP_PEER_DEVICE_NONE: + case DP_PEER_DEVICE_MST_BRANCHING: + break; + + case DP_PEER_DEVICE_SST_SINK: + status = connector_status_connected; + break; + case DP_PEER_DEVICE_DP_LEGACY_CONV: + if (port->ldps) + status = connector_status_connected; + break; + } +out: + return status; +} +EXPORT_SYMBOL(drm_dp_mst_detect_port); + +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + struct edid *edid = NULL; + + edid = drm_get_edid(connector, &port->aux.ddc); + return edid; +} +EXPORT_SYMBOL(drm_dp_mst_get_edid); + +static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_vcpi *vcpi, int pbn, int force) +{ + int num_slots; + int ret; + + num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); + + if (num_slots > mgr->avail_slots) + return -ENOSPC; + + ret = drm_dp_mst_assign_payload_id(mgr, force); + if (ret < 0) + return ret; + + vcpi->vcpi = ret; + vcpi->pbn = pbn; + vcpi->aligned_pbn = num_slots * mgr->pbn_div; + vcpi->num_slots = num_slots; + + mgr->proposed_vcpis[ret] = vcpi; + return 0; +} + +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots, int force_override) +{ + int ret; + + if (pbn == port->vcpi.pbn) { + DRM_DEBUG_KMS("already have vcpi allocated for pbn %d\n", pbn); + *slots = port->vcpi.num_slots; + return true; + } + + ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, force_override); + if (ret) { + DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); + goto out; + } + DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); + *slots = port->vcpi.num_slots; + + return true; +out: + return false; +} +EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); + +static void drm_dp_destroy_vcpi(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_vcpi *vcpi) +{ + + drm_dp_mst_put_payload_id(mgr, vcpi->vcpi); + vcpi->num_slots = vcpi->pbn = vcpi->aligned_pbn = 0; +} + +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +{ + mgr->proposed_vcpis[port->vcpi.vcpi] = NULL; + drm_dp_destroy_vcpi(mgr, &port->vcpi); + port->vcpi.vcpi = -1; +} +EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); + +static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, + int id, struct drm_dp_payload *payload) +{ + u8 payload_alloc[3], status; + int ret; + int retries = 0; + + drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, + DP_PAYLOAD_TABLE_UPDATED); + + payload_alloc[0] = id; + payload_alloc[1] = payload->start_slot; + payload_alloc[2] = payload->num_slots; + + ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); + if (ret != 3) { + DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); + goto fail; + } + + retry: + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); + if (ret < 0) { + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); + goto fail; + } + + if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { + if (retries++ < 5) { + udelay(10); + goto retry; + } + DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); + ret = -EINVAL; + goto fail; + } + ret = 0; +fail: + return ret; +} + +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) +{ + u8 status; + int ret; + int count = 0; + + do { + ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); + if (ret < 0) { + DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); + goto fail; + } + + if (status & DP_PAYLOAD_ACT_HANDLED) + break; + count++; + udelay(100); + + } while (count < 30); + + if (!(status & DP_PAYLOAD_ACT_HANDLED)) { + DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); + ret = -EINVAL; + goto fail; + } + return 0; +fail: + return ret; +} +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; +} +EXPORT_SYMBOL(drm_dp_calc_pbn_mode); + +static int test_calc_pbn_mode(void) +{ + int ret; + ret = drm_dp_calc_pbn_mode(154000, 30); + if (ret != 689) + return -EINVAL; + ret = drm_dp_calc_pbn_mode(234000, 30); + if (ret != 1047) + return -EINVAL; + return 0; +} diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h new file mode 100644 index 0000000..290f3cd --- /dev/null +++ b/include/drm/drm_dp_mst_helper.h @@ -0,0 +1,403 @@ +/* + * Copyright © 2014 Red Hat. + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ +#ifndef _DRM_DP_MST_HELPER_H_ +#define _DRM_DP_MST_HELPER_H_ + +#include <linux/types.h> +#include <drm/drm_dp_helper.h> + +struct drm_dp_mst_branch; + +/* vpci channel info */ +struct drm_dp_vcpi { + int vcpi; + int pbn; + int aligned_pbn; + int num_slots; + struct list_head next; +}; + +/* display port MST port */ +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; + bool ddps; + u8 pdt; + bool ldps; + u8 dpcd_rev; + uint8_t dpcd[DP_RECEIVER_CAP_SIZE]; + uint16_t available_pbn; + struct list_head next; + struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */ + struct drm_dp_aux aux; /* i2c bus for this port? */ + struct drm_dp_mst_branch *parent; + + struct drm_dp_vcpi vcpi; + struct drm_connector *connector; +}; + +/* list of MST branch devices we know about */ +/* we can only have two outstanding un ack msgs for + each MST device */ +struct drm_dp_mst_branch { + struct kref kref; + u8 rad[8]; + u8 lct; + int num_ports; + + int msg_slots; + struct list_head ports; + u8 fail; + /* list of tx ops queue for this port */ + bool parent_is_port; + struct drm_dp_mst_port *port_parent; + struct drm_dp_mst_topology_mgr *mgr; + + spinlock_t slots_lock; + struct drm_dp_sideband_msg_tx *tx_slots[2]; +}; + + +/* sideband msg header - not bit struct */ +struct drm_dp_sideband_msg_hdr { + u8 lct; + u8 lcr; + u8 rad[8]; + bool broadcast; + bool path_msg; + u8 msg_len; + bool somt; + bool eomt; + bool seqno; +}; + +struct drm_dp_nak_reply { + u8 guid[16]; + u8 reason; + u8 nak_data; +}; + +struct drm_dp_link_address_ack_reply { + u8 guid[16]; + u8 nports; + struct drm_dp_link_addr_reply_port { + bool input_port; + u8 peer_device_type; + u8 port_number; + bool mcs; + bool ddps; + bool legacy_device_plug_status; + u8 dpcd_revision; + u8 peer_guid[16]; + bool num_sdp_streams; + bool num_sdp_stream_sinks; + } ports[16]; +}; + +struct drm_dp_remote_dpcd_read_ack_reply { + u8 port_number; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_dpcd_write_ack_reply { + u8 port_number; +}; + +struct drm_dp_remote_dpcd_write_nak_reply { + u8 port_number; + u8 reason; + u8 bytes_written_before_failure; +}; + +struct drm_dp_remote_i2c_read_ack_reply { + u8 port_number; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_i2c_read_nak_reply { + u8 port_number; + u8 nak_reason; + u8 i2c_nak_transaction; +}; + +struct drm_dp_remote_i2c_write_ack_reply { + u8 port_number; +}; + + +struct drm_dp_sideband_msg_rx { + u8 chunk[48]; + u8 msg[256]; + u8 curchunk_len; + u8 curchunk_idx; /* chunk we are parsing now */ + u8 curchunk_hdrlen; + u8 curlen; /* total length of the msg */ + bool have_somt; + bool have_eomt; + struct drm_dp_sideband_msg_hdr initial_hdr; +}; + + +struct drm_dp_allocate_payload { + u8 port_number; + u8 number_sdp_streams; + u8 vcpi; + u16 pbn; + u8 sdp_stream_sink[8]; +}; + +struct drm_dp_allocate_payload_ack_reply { + u8 port_number; + u8 vcpi; + u16 allocated_pbn; +}; + +struct drm_dp_connection_status_notify { + u8 guid[16]; + u8 port_number; + bool legacy_device_plug_status; + bool displayport_device_plug_status; + bool message_capability_status; + bool input_port; + u8 peer_device_type; +}; + +struct drm_dp_remote_dpcd_read { + u8 port_number; + u32 dpcd_address; + u8 num_bytes; +}; + +struct drm_dp_remote_dpcd_write { + u8 port_number; + u32 dpcd_address; + u8 num_bytes; + u8 bytes[255]; +}; + +struct drm_dp_remote_i2c_read { + u8 num_transactions; + u8 port_number; + struct { + u8 i2c_dev_id; + u8 num_bytes; + u8 bytes[255]; + u8 no_stop_bit; + u8 i2c_transaction_delay; + } transactions[4]; + u8 read_i2c_device_id; + u8 num_bytes_read; +}; + +struct drm_dp_remote_i2c_write { + u8 port_number; + u8 write_i2c_device_id; + u8 num_bytes; + u8 bytes[255]; +}; + +/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ +struct drm_dp_port_number_req { + u8 port_number; +}; + +struct drm_dp_enum_path_resources_ack_reply { + u8 port_number; + u16 full_payload_bw_number; + u16 avail_payload_bw_number; +}; + +/* covers POWER_DOWN_PHY, POWER_UP_PHY */ +struct drm_dp_port_number_rep { + u8 port_number; +}; + +struct drm_dp_query_payload { + u8 port_number; + u8 vcpi; +}; + +struct drm_dp_resource_status_notify { + u8 port_number; + u8 guid[16]; + u16 available_pbn; +}; + +struct drm_dp_query_payload_ack_reply { + u8 port_number; + u8 allocated_pbn; +}; + +struct drm_dp_sideband_msg_req_body { + u8 req_type; + union ack_req { + struct drm_dp_connection_status_notify conn_stat; + struct drm_dp_port_number_req port_num; + struct drm_dp_resource_status_notify resource_stat; + + struct drm_dp_query_payload query_payload; + struct drm_dp_allocate_payload allocate_payload; + + struct drm_dp_remote_dpcd_read dpcd_read; + struct drm_dp_remote_dpcd_write dpcd_write; + + struct drm_dp_remote_i2c_read i2c_read; + struct drm_dp_remote_i2c_write i2c_write; + } u; +}; + +struct drm_dp_sideband_msg_reply_body { + u8 reply_type; + u8 req_type; + union ack_replies { + struct drm_dp_nak_reply nak; + struct drm_dp_link_address_ack_reply link_addr; + struct drm_dp_port_number_rep port_number; + + struct drm_dp_enum_path_resources_ack_reply path_resources; + struct drm_dp_allocate_payload_ack_reply allocate_payload; + struct drm_dp_query_payload_ack_reply query_payload; + + struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; + struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; + struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; + + struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; + struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; + struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; + } u; +}; + +/* msg is queued to be put into a slot */ +#define DRM_DP_SIDEBAND_TX_QUEUED 0 +/* msg has started transmitting on a slot - still on msgq */ +#define DRM_DP_SIDEBAND_TX_START_SEND 1 +/* msg has finished transmitting on a slot - removed from msgq only in slot */ +#define DRM_DP_SIDEBAND_TX_SENT 2 +/* msg has received a response - removed from slot */ +#define DRM_DP_SIDEBAND_TX_RX 3 +#define DRM_DP_SIDEBAND_TX_TIMEOUT 4 + +struct drm_dp_sideband_msg_tx { + u8 msg[256]; + u8 chunk[48]; + u8 cur_offset; + u8 cur_len; + struct drm_dp_mst_branch *dst; + struct list_head next; + int seqno; + int state; + struct drm_dp_sideband_msg_reply_body reply; +}; + +/* sideband msg handler */ +struct drm_dp_mst_topology_mgr; +struct drm_dp_mst_topology_cbs { + /* create a connector for a port */ + struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); + void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, + struct drm_connector *connector); + void (*generate_act_event)(struct drm_dp_mst_topology_mgr *mgr); +}; + +#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) + +#define DP_PAYLOAD_LOCAL 1 +#define DP_PAYLOAD_REMOTE 2 + +struct drm_dp_payload { + int payload_state; + int start_slot; + int num_slots; + struct drm_dp_mst_port *port; +}; + +struct drm_dp_mst_topology_mgr { + struct device *dev; + struct drm_dp_mst_topology_cbs *cbs; + bool mst_state; + int max_dpcd_transaction_bytes; + struct drm_dp_aux *aux; /* auxch for this topology mgr to use */ + + struct mutex lock; + struct drm_dp_sideband_msg_rx down_rep_recv; + struct drm_dp_sideband_msg_rx up_req_recv; + + /* pointer to info about the initial MST device */ + struct drm_dp_mst_branch *mst_primary; + + /* primary MST device GUID */ + bool guid_valid; + u8 guid[16]; + + /* messages to be transmitted */ + struct list_head tx_msg_downq; + struct list_head tx_msg_upq; + bool tx_down_in_progress; + bool tx_up_in_progress; + + struct drm_dp_vcpi **proposed_vcpis; + struct drm_dp_payload *payloads; + + int max_payloads; + unsigned long payload_mask; + /* protect the upq/downq and in_progress */ + spinlock_t qlock; + + wait_queue_head_t tx_waitq; + struct work_struct work; + + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + int pbn_div; + int total_pbn; + int total_slots; + int avail_slots; +}; + +int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads); +void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); +int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); +int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, int irq_vector); + +/* hacky interface for now */ +enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); +struct drm_connector; +struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); +int drm_dp_calc_pbn_mode(int clock, int bpp); + +bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots, int force_override); +void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, + struct drm_dp_mst_port *port); +int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); +int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); +int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); + +#endif