#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
+#include <linux/iopoll.h>
#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
#include <linux/stacktrace.h>
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)
+static int drm_dp_sideband_msg_set_header(struct drm_dp_sideband_msg_rx *msg,
+ struct drm_dp_sideband_msg_hdr *hdr,
+ u8 hdrlen)
{
- int ret;
- u8 crc4;
+ /*
+ * ignore out-of-order messages or messages that are part of a
+ * failed transaction
+ */
+ if (!hdr->somt && !msg->have_somt)
+ return false;
- 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) {
- print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
- return false;
- }
+ /* get length contained in this portion */
+ msg->curchunk_idx = 0;
+ msg->curchunk_len = hdr->msg_len;
+ msg->curchunk_hdrlen = hdrlen;
- /*
- * ignore out-of-order messages or messages that are part of a
- * failed transaction
- */
- if (!recv_hdr.somt && !msg->have_somt)
- return false;
+ /* we have already gotten an somt - don't bother parsing */
+ if (hdr->somt && msg->have_somt)
+ return false;
- /* get length contained in this portion */
- msg->curchunk_len = recv_hdr.msg_len;
- msg->curchunk_hdrlen = hdrlen;
+ if (hdr->somt) {
+ memcpy(&msg->initial_hdr, hdr,
+ sizeof(struct drm_dp_sideband_msg_hdr));
+ msg->have_somt = true;
+ }
+ if (hdr->eomt)
+ msg->have_eomt = true;
- /* we have already gotten an somt - don't bother parsing */
- if (recv_hdr.somt && msg->have_somt)
- return false;
+ return true;
+}
- 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;
+/* this adds a chunk of msg to the builder to get the final msg */
+static bool drm_dp_sideband_append_payload(struct drm_dp_sideband_msg_rx *msg,
+ u8 *replybuf, u8 replybuflen)
+{
+ u8 crc4;
- /* 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;
- }
+ 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);
+ if (crc4 != msg->chunk[msg->curchunk_len - 1])
+ print_hex_dump(KERN_DEBUG, "wrong crc",
+ DUMP_PREFIX_NONE, 16, 1,
+ msg->chunk, msg->curchunk_len, false);
/* copy chunk into bigger msg */
memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
msg->curlen += msg->curchunk_len - 1;
}
}
-static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
+static void 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.u.dpcd_write.num_bytes = num_bytes;
req.u.dpcd_write.bytes = bytes;
drm_dp_encode_sideband_req(&req, msg);
-
- return 0;
}
-static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
+static void 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_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
+static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
{
struct drm_dp_sideband_msg_req_body req;
req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE;
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)
+static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg,
+ int port_num)
{
struct drm_dp_sideband_msg_req_body req;
return 0;
}
-static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
- u8 vcpi, uint16_t pbn,
- u8 number_sdp_streams,
- u8 *sdp_stream_sink)
+static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg,
+ int port_num,
+ u8 vcpi, uint16_t pbn,
+ u8 number_sdp_streams,
+ u8 *sdp_stream_sink)
{
struct drm_dp_sideband_msg_req_body req;
memset(&req, 0, sizeof(req));
number_sdp_streams);
drm_dp_encode_sideband_req(&req, msg);
msg->path_msg = true;
- return 0;
}
-static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
- int port_num, bool power_up)
+static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
+ int port_num, bool power_up)
{
struct drm_dp_sideband_msg_req_body req;
req.u.port_num.port_number = port_num;
drm_dp_encode_sideband_req(&req, msg);
msg->path_msg = true;
- return 0;
}
static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
* sideband messaging as drm_dp_dpcd_write() does for local
* devices via actual AUX CH.
*
- * Return: 0 on success, negative error code on failure.
+ * Return: number of bytes written on success, negative error code on failure.
*/
ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
unsigned int offset, void *buffer, size_t size)
offset, size, buffer);
}
-static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
+static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
{
- int ret;
+ int ret = 0;
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);
+ 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,
- mstb->guid,
- 16);
+ ret = drm_dp_dpcd_write(mstb->mgr->aux,
+ DP_GUID, mstb->guid, 16);
}
}
+
+ if (ret < 16 && ret > 0)
+ return -EPROTO;
+
+ return ret == 16 ? 0 : ret;
}
static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
drm_connector_set_tile_property(port->connector);
}
- mgr->cbs->register_connector(port->connector);
+ drm_connector_register(port->connector);
return;
error:
return false;
}
-static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
+static void 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.u.dpcd_read.dpcd_address = offset;
req.u.dpcd_read.num_bytes = num_bytes;
drm_dp_encode_sideband_req(&req, msg);
-
- return 0;
}
static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_sideband_msg_tx *txmsg;
struct drm_dp_link_address_ack_reply *reply;
struct drm_dp_mst_port *port, *tmp;
- int i, len, ret, port_mask = 0;
+ int i, ret, port_mask = 0;
bool changed = false;
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
return -ENOMEM;
txmsg->dst = mstb;
- len = build_link_address(txmsg);
+ build_link_address(txmsg);
mstb->link_address_sent = true;
drm_dp_queue_down_tx(mgr, txmsg);
DRM_DEBUG_KMS("link address reply: %d\n", reply->nports);
drm_dp_dump_link_address(reply);
- drm_dp_check_mstb_guid(mstb, reply->guid);
+ ret = drm_dp_check_mstb_guid(mstb, reply->guid);
+ if (ret) {
+ char buf[64];
+
+ drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf));
+ DRM_ERROR("GUID check on %s failed: %d\n",
+ buf, ret);
+ goto out;
+ }
for (i = 0; i < reply->nports; i++) {
port_mask |= BIT(reply->ports[i].port_number);
struct drm_dp_mst_branch *mstb)
{
struct drm_dp_sideband_msg_tx *txmsg;
- int len, ret;
+ int ret;
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
if (!txmsg)
return;
txmsg->dst = mstb;
- len = build_clear_payload_id_table(txmsg);
+ build_clear_payload_id_table(txmsg);
drm_dp_queue_down_tx(mgr, txmsg);
{
struct drm_dp_enum_path_resources_ack_reply *path_res;
struct drm_dp_sideband_msg_tx *txmsg;
- int len;
int ret;
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
return -ENOMEM;
txmsg->dst = mstb;
- len = build_enum_path_resources(txmsg, port->port_num);
+ build_enum_path_resources(txmsg, port->port_num);
drm_dp_queue_down_tx(mgr, txmsg);
{
struct drm_dp_sideband_msg_tx *txmsg;
struct drm_dp_mst_branch *mstb;
- int len, ret, port_num;
+ int ret, port_num;
u8 sinks[DRM_DP_MAX_SDP_STREAMS];
int i;
sinks[i] = i;
txmsg->dst = mstb;
- len = build_allocate_payload(txmsg, port_num,
- id,
- pbn, port->num_sdp_streams, sinks);
+ build_allocate_payload(txmsg, port_num,
+ id,
+ pbn, port->num_sdp_streams, sinks);
drm_dp_queue_down_tx(mgr, txmsg);
struct drm_dp_mst_port *port, bool power_up)
{
struct drm_dp_sideband_msg_tx *txmsg;
- int len, ret;
+ int ret;
port = drm_dp_mst_topology_get_port_validated(mgr, port);
if (!port)
}
txmsg->dst = port->parent;
- len = build_power_updown_phy(txmsg, port->port_num, power_up);
+ build_power_updown_phy(txmsg, port->port_num, power_up);
drm_dp_queue_down_tx(mgr, txmsg);
ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);
struct drm_dp_mst_port *port,
int offset, int size, u8 *bytes)
{
- int len;
int ret = 0;
struct drm_dp_sideband_msg_tx *txmsg;
struct drm_dp_mst_branch *mstb;
goto fail_put;
}
- len = build_dpcd_read(txmsg, port->port_num, offset, size);
+ build_dpcd_read(txmsg, port->port_num, offset, size);
txmsg->dst = port->parent;
drm_dp_queue_down_tx(mgr, txmsg);
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;
goto fail_put;
}
- len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
+ build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
txmsg->dst = mstb;
drm_dp_queue_down_tx(mgr, txmsg);
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
- if (ret > 0) {
- if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
- ret = -EIO;
- else
- ret = 0;
- }
+ if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ ret = -EIO;
+
kfree(txmsg);
fail_put:
drm_dp_mst_topology_put_mstb(mstb);
int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
{
int ret = 0;
- int i = 0;
struct drm_dp_mst_branch *mstb = NULL;
+ mutex_lock(&mgr->payload_lock);
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_payload reset_pay;
+
WARN_ON(mgr->mst_primary);
/* get dpcd info */
drm_dp_mst_topology_get_mstb(mgr->mst_primary);
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
- DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
- if (ret < 0) {
+ DP_MST_EN |
+ DP_UP_REQ_EN |
+ DP_UPSTREAM_IS_SRC);
+ if (ret < 0)
goto out_unlock;
- }
- {
- 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);
- }
+ 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);
/* this can fail if the device is gone */
drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
ret = 0;
- mutex_lock(&mgr->payload_lock);
- memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
+ memset(mgr->payloads, 0,
+ mgr->max_payloads * sizeof(mgr->payloads[0]));
+ memset(mgr->proposed_vcpis, 0,
+ mgr->max_payloads * sizeof(mgr->proposed_vcpis[0]));
mgr->payload_mask = 0;
set_bit(0, &mgr->payload_mask);
- for (i = 0; i < mgr->max_payloads; i++) {
- struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i];
-
- if (vcpi) {
- vcpi->vcpi = 0;
- vcpi->num_slots = 0;
- }
- mgr->proposed_vcpis[i] = NULL;
- }
mgr->vcpi_mask = 0;
- mutex_unlock(&mgr->payload_lock);
-
mgr->payload_id_table_cleared = false;
}
out_unlock:
mutex_unlock(&mgr->lock);
+ mutex_unlock(&mgr->payload_lock);
if (mstb)
drm_dp_mst_topology_put_mstb(mstb);
return ret;
DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
goto out_fail;
}
- drm_dp_check_mstb_guid(mgr->mst_primary, guid);
+
+ ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid);
+ if (ret) {
+ DRM_DEBUG_KMS("check mstb failed - undocked during suspend?\n");
+ goto out_fail;
+ }
/*
* For the final step of resuming the topology, we need to bring the
}
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
-static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
+static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up,
+ struct drm_dp_mst_branch **mstb, int *seqno)
{
int len;
u8 replyblock[32];
- int replylen, origlen, curreply;
+ int replylen, curreply;
int ret;
+ u8 hdrlen;
+ struct drm_dp_sideband_msg_hdr hdr;
struct drm_dp_sideband_msg_rx *msg;
- int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
- msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
+ int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE :
+ DP_SIDEBAND_MSG_DOWN_REP_BASE;
+
+ if (!up)
+ *mstb = NULL;
+ *seqno = -1;
len = min(mgr->max_dpcd_transaction_bytes, 16);
- ret = drm_dp_dpcd_read(mgr->aux, basereg,
- replyblock, len);
+ 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 false;
}
- ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
+
+ ret = drm_dp_decode_sideband_msg_hdr(&hdr, replyblock, len, &hdrlen);
+ if (ret == false) {
+ print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16,
+ 1, replyblock, len, false);
+ DRM_DEBUG_KMS("ERROR: failed header\n");
+ return false;
+ }
+
+ *seqno = hdr.seqno;
+
+ if (up) {
+ msg = &mgr->up_req_recv;
+ } else {
+ /* Caller is responsible for giving back this reference */
+ *mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad);
+ if (!*mstb) {
+ DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",
+ hdr.lct);
+ return false;
+ }
+ msg = &(*mstb)->down_rep_recv[hdr.seqno];
+ }
+
+ if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) {
+ DRM_DEBUG_KMS("sideband msg set header failed %d\n",
+ replyblock[0]);
+ return false;
+ }
+
+ replylen = min(msg->curchunk_len, (u8)(len - hdrlen));
+ ret = drm_dp_sideband_append_payload(msg, replyblock + hdrlen, replylen);
if (!ret) {
DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
return false;
}
- replylen = msg->curchunk_len + msg->curchunk_hdrlen;
- origlen = replylen;
- replylen -= len;
+ replylen = msg->curchunk_len + msg->curchunk_hdrlen - len;
curreply = len;
while (replylen > 0) {
len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
return false;
}
- ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
+ ret = drm_dp_sideband_append_payload(msg, replyblock, len);
if (!ret) {
DRM_DEBUG_KMS("failed to build sideband msg\n");
return false;
static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
{
struct drm_dp_sideband_msg_tx *txmsg;
- struct drm_dp_mst_branch *mstb;
- struct drm_dp_sideband_msg_hdr *hdr = &mgr->down_rep_recv.initial_hdr;
- int slot = -1;
+ struct drm_dp_mst_branch *mstb = NULL;
+ struct drm_dp_sideband_msg_rx *msg = NULL;
+ int seqno = -1;
- if (!drm_dp_get_one_sb_msg(mgr, false))
- goto clear_down_rep_recv;
+ if (!drm_dp_get_one_sb_msg(mgr, false, &mstb, &seqno))
+ goto out_clear_reply;
- if (!mgr->down_rep_recv.have_eomt)
- return 0;
+ msg = &mstb->down_rep_recv[seqno];
- mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad);
- if (!mstb) {
- DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",
- hdr->lct);
- goto clear_down_rep_recv;
- }
+ /* Multi-packet message transmission, don't clear the reply */
+ if (!msg->have_eomt)
+ goto out;
/* find the message */
- slot = hdr->seqno;
mutex_lock(&mgr->qlock);
- txmsg = mstb->tx_slots[slot];
+ txmsg = mstb->tx_slots[seqno];
/* remove from slots */
mutex_unlock(&mgr->qlock);
if (!txmsg) {
+ struct drm_dp_sideband_msg_hdr *hdr;
+ hdr = &msg->initial_hdr;
DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
mstb, hdr->seqno, hdr->lct, hdr->rad[0],
- mgr->down_rep_recv.msg[0]);
- goto no_msg;
+ msg->msg[0]);
+ goto out_clear_reply;
}
- drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
+ drm_dp_sideband_parse_reply(msg, &txmsg->reply);
- if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n",
txmsg->reply.req_type,
drm_dp_mst_req_type_str(txmsg->reply.req_type),
txmsg->reply.u.nak.reason,
drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),
txmsg->reply.u.nak.nak_data);
+ }
- memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
+ memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
drm_dp_mst_topology_put_mstb(mstb);
mutex_lock(&mgr->qlock);
txmsg->state = DRM_DP_SIDEBAND_TX_RX;
- mstb->tx_slots[slot] = NULL;
+ mstb->tx_slots[seqno] = NULL;
mgr->is_waiting_for_dwn_reply = false;
mutex_unlock(&mgr->qlock);
return 0;
-no_msg:
- drm_dp_mst_topology_put_mstb(mstb);
-clear_down_rep_recv:
+out_clear_reply:
mutex_lock(&mgr->qlock);
mgr->is_waiting_for_dwn_reply = false;
mutex_unlock(&mgr->qlock);
- memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
+ if (msg)
+ memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
+out:
+ if (mstb)
+ drm_dp_mst_topology_put_mstb(mstb);
return 0;
}
static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
{
- struct drm_dp_sideband_msg_hdr *hdr = &mgr->up_req_recv.initial_hdr;
struct drm_dp_pending_up_req *up_req;
- bool seqno;
+ int seqno;
- if (!drm_dp_get_one_sb_msg(mgr, true))
+ if (!drm_dp_get_one_sb_msg(mgr, true, NULL, &seqno))
goto out;
if (!mgr->up_req_recv.have_eomt)
}
INIT_LIST_HEAD(&up_req->next);
- seqno = hdr->seqno;
drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg);
if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&
res_stat->available_pbn);
}
- up_req->hdr = *hdr;
+ up_req->hdr = mgr->up_req_recv.initial_hdr;
mutex_lock(&mgr->up_req_lock);
list_add_tail(&up_req->next, &mgr->up_req_list);
mutex_unlock(&mgr->up_req_lock);
}
EXPORT_SYMBOL(drm_dp_mst_detect_port);
-/**
- * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
- * @mgr: manager for this port
- * @port: unverified pointer to a port.
- *
- * This returns whether the port supports audio or not.
- */
-bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
- struct drm_dp_mst_port *port)
-{
- bool ret = false;
-
- port = drm_dp_mst_topology_get_port_validated(mgr, port);
- if (!port)
- return ret;
- ret = port->has_audio;
- drm_dp_mst_topology_put_port(port);
- return ret;
-}
-EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
-
/**
* drm_dp_mst_get_edid() - get EDID for an MST port
* @connector: toplevel connector to get EDID for
return ret;
}
+static int do_get_act_status(struct drm_dp_aux *aux)
+{
+ int ret;
+ u8 status;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ return status;
+}
/**
- * drm_dp_check_act_status() - Check ACT handled status.
+ * drm_dp_check_act_status() - Polls for ACT handled status.
* @mgr: manager to use
*
- * Check the payload status bits in the DPCD for ACT handled completion.
+ * Tries waiting for the MST hub to finish updating it's payload table by
+ * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really
+ * take that long).
+ *
+ * Returns:
+ * 0 if the ACT was handled in time, negative error code on failure.
*/
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;
+ /*
+ * There doesn't seem to be any recommended retry count or timeout in
+ * the MST specification. Since some hubs have been observed to take
+ * over 1 second to update their payload allocations under certain
+ * conditions, we use a rather large timeout value.
+ */
+ const int timeout_ms = 3000;
+ int ret, status;
+
+ ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,
+ status & DP_PAYLOAD_ACT_HANDLED || status < 0,
+ 200, timeout_ms * USEC_PER_MSEC);
+ if (ret < 0 && status >= 0) {
+ DRM_ERROR("Failed to get ACT after %dms, last status: %02x\n",
+ timeout_ms, status);
+ return -EINVAL;
+ } else if (status < 0) {
+ /*
+ * Failure here isn't unexpected - the hub may have
+ * just been unplugged
+ */
+ DRM_DEBUG_KMS("Failed to read payload table status: %d\n",
+ status);
+ return status;
}
+
return 0;
-fail:
- return ret;
}
EXPORT_SYMBOL(drm_dp_check_act_status);
int ret;
ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
+ if (ret) {
+ seq_printf(m, "dpcd read failed\n");
+ goto out;
+ }
seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
+
ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
+ if (ret) {
+ seq_printf(m, "faux/mst read failed\n");
+ goto out;
+ }
seq_printf(m, "faux/mst: %*ph\n", 2, buf);
+
ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
+ if (ret) {
+ seq_printf(m, "mst ctrl read failed\n");
+ goto out;
+ }
seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
/* dump the standard OUI branch header */
ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
+ if (ret) {
+ seq_printf(m, "branch oui read failed\n");
+ goto out;
+ }
seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
+
for (i = 0x3; i < 0x8 && buf[i]; i++)
seq_printf(m, "%c", buf[i]);
seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
}
+out:
mutex_unlock(&mgr->lock);
}
static inline void
drm_dp_delayed_destroy_port(struct drm_dp_mst_port *port)
{
- if (port->connector)
- port->mgr->cbs->destroy_connector(port->mgr, port->connector);
+ if (port->connector) {
+ drm_connector_unregister(port->connector);
+ drm_connector_put(port->connector);
+ }
drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs);
drm_dp_mst_put_port_malloc(port);
if (drm_dp_read_desc(port->mgr->aux, &desc, true))
return NULL;
- if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
+ if (drm_dp_has_quirk(&desc, 0,
+ DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 &&
port->parent == port->mgr->mst_primary) {
u8 downstreamport;
projects / linux-2.6-microblaze.git / blobdiff