[Patch v2 2/3] drm/mst: Refactor the flow for payload allocation/removement
Lyude Paul
lyude at redhat.com
Thu Aug 17 22:16:31 UTC 2023
Two small comments:
On Mon, 2023-08-07 at 10:56 +0800, Wayne Lin wrote:
> [Why]
> Today, the allocation/deallocation steps and status is a bit unclear.
>
> For instance, payload->vc_start_slot = -1 stands for "the failure of
> updating DPCD payload ID table" and can also represent as "payload is not
> allocated yet". These two cases should be handled differently and hence
> better to distinguish them for better understanding.
>
> [How]
> Define enumeration - ALLOCATION_LOCAL, ALLOCATION_DFP and ALLOCATION_REMOTE
> to distinguish different allocation status. Adjust the code to handle
> different status accordingly for better understanding the sequence of
> payload allocation and payload removement.
>
> For payload creation, the procedure should look like this:
> DRM part 1:
> * step 1 - update sw mst mgr variables to add a new payload
> * step 2 - add payload at immediate DFP DPCD payload table
>
> Driver:
> * Add new payload in HW and sync up with DFP by sending ACT
>
> DRM Part 2:
> * Send ALLOCATE_PAYLOAD sideband message to allocate bandwidth along the
> virtual channel.
>
> And as for payload removement, the procedure should look like this:
> DRM part 1:
> * step 1 - Send ALLOCATE_PAYLOAD sideband message to release bandwidth
> along the virtual channel
> * step 2 - Clear payload allocation at immediate DFP DPCD payload table
>
> Driver:
> * Remove the payload in HW and sync up with DFP by sending ACT
>
> DRM part 2:
> * update sw mst mgr variables to remove the payload
>
> Note that it's fine to fail when communicate with the branch device
> connected at immediate downstrean-facing port, but updating variables of
> SW mst mgr and HW configuration should be conducted anyway. That's because
> it's under commit_tail and we need to complete the HW programming.
>
> Changes since v1:
> * Remove the set but not use variable 'old_payload' in function
> 'nv50_msto_prepare'. Catched by kernel test robot <lkp at intel.com>
>
> Signed-off-by: Wayne Lin <Wayne.Lin at amd.com>
> ---
> .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 20 ++-
> drivers/gpu/drm/display/drm_dp_mst_topology.c | 159 +++++++++++-------
> drivers/gpu/drm/i915/display/intel_dp_mst.c | 18 +-
> drivers/gpu/drm/nouveau/dispnv50/disp.c | 21 +--
> include/drm/display/drm_dp_mst_helper.h | 23 ++-
> 5 files changed, 153 insertions(+), 88 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index d9a482908380..9ad509279b0a 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -219,7 +219,7 @@ static void dm_helpers_construct_old_payload(
> /* Set correct time_slots/PBN of old payload.
> * other fields (delete & dsc_enabled) in
> * struct drm_dp_mst_atomic_payload are don't care fields
> - * while calling drm_dp_remove_payload()
> + * while calling drm_dp_remove_payload_part2()
> */
> for (i = 0; i < current_link_table.stream_count; i++) {
> dc_alloc =
> @@ -262,13 +262,12 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
>
> mst_mgr = &aconnector->mst_root->mst_mgr;
> mst_state = to_drm_dp_mst_topology_state(mst_mgr->base.state);
> -
> - /* It's OK for this to fail */
> new_payload = drm_atomic_get_mst_payload_state(mst_state, aconnector->mst_output_port);
>
> if (enable) {
> target_payload = new_payload;
>
> + /* It's OK for this to fail */
> drm_dp_add_payload_part1(mst_mgr, mst_state, new_payload);
> } else {
> /* construct old payload by VCPI*/
> @@ -276,7 +275,7 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
> new_payload, &old_payload);
> target_payload = &old_payload;
>
> - drm_dp_remove_payload(mst_mgr, mst_state, &old_payload, new_payload);
> + drm_dp_remove_payload_part1(mst_mgr, mst_state, new_payload);
> }
>
> /* mst_mgr->->payloads are VC payload notify MST branch using DPCD or
> @@ -342,7 +341,7 @@ bool dm_helpers_dp_mst_send_payload_allocation(
> struct amdgpu_dm_connector *aconnector;
> struct drm_dp_mst_topology_state *mst_state;
> struct drm_dp_mst_topology_mgr *mst_mgr;
> - struct drm_dp_mst_atomic_payload *payload;
> + struct drm_dp_mst_atomic_payload *new_payload, *old_payload;
> enum mst_progress_status set_flag = MST_ALLOCATE_NEW_PAYLOAD;
> enum mst_progress_status clr_flag = MST_CLEAR_ALLOCATED_PAYLOAD;
> int ret = 0;
> @@ -355,15 +354,20 @@ bool dm_helpers_dp_mst_send_payload_allocation(
> mst_mgr = &aconnector->mst_root->mst_mgr;
> mst_state = to_drm_dp_mst_topology_state(mst_mgr->base.state);
>
> - payload = drm_atomic_get_mst_payload_state(mst_state, aconnector->mst_output_port);
> + new_payload = drm_atomic_get_mst_payload_state(mst_state, aconnector->mst_output_port);
>
> if (!enable) {
> set_flag = MST_CLEAR_ALLOCATED_PAYLOAD;
> clr_flag = MST_ALLOCATE_NEW_PAYLOAD;
> }
>
> - if (enable)
> - ret = drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload);
> + if (enable) {
> + ret = drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, new_payload);
> + } else {
> + dm_helpers_construct_old_payload(stream->link, mst_state->pbn_div,
> + new_payload, old_payload);
> + drm_dp_remove_payload_part2(mst_mgr, mst_state, old_payload, new_payload);
> + }
>
> if (ret) {
> amdgpu_dm_set_mst_status(&aconnector->mst_status,
> diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
> index 4d80426757ab..e04f87ff755a 100644
> --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
> @@ -3255,15 +3255,15 @@ int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
> }
> EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status);
>
> -static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
> - struct drm_dp_mst_atomic_payload *payload)
> +static int drm_dp_create_payload_at_dfp(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_atomic_payload *payload)
> {
> return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot,
> payload->time_slots);
> }
>
> -static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
> - struct drm_dp_mst_atomic_payload *payload)
> +static int drm_dp_create_payload_to_remote(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_atomic_payload *payload)
> {
> int ret;
> struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
> @@ -3276,17 +3276,20 @@ static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
> return ret;
> }
>
> -static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
> - struct drm_dp_mst_topology_state *mst_state,
> - struct drm_dp_mst_atomic_payload *payload)
> +static void drm_dp_destroy_payload_at_remote_and_dfp(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_topology_state *mst_state,
> + struct drm_dp_mst_atomic_payload *payload)
> {
> drm_dbg_kms(mgr->dev, "\n");
>
> /* it's okay for these to fail */
> - drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0);
> - drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0);
> + if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE) {
> + drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0);
> + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_DFP;
> + }
>
> - return 0;
> + if (payload->payload_allocation_status == DRM_DP_MST_PAYLOAD_ALLOCATION_DFP)
> + drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0);
> }
>
> /**
> @@ -3296,81 +3299,105 @@ static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
> * @payload: The payload to write
> *
> * Determines the starting time slot for the given payload, and programs the VCPI for this payload
> - * into hardware. After calling this, the driver should generate ACT and payload packets.
> + * into the DPCD of DPRX. After calling this, the driver should generate ACT and payload packets.
> *
> - * Returns: 0 on success, error code on failure. In the event that this fails,
> - * @payload.vc_start_slot will also be set to -1.
> + * Returns: 0 on success, error code on failure.
> */
> int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
> struct drm_dp_mst_topology_state *mst_state,
> struct drm_dp_mst_atomic_payload *payload)
> {
> struct drm_dp_mst_port *port;
> - int ret;
> + int ret = 0;
> + bool allocate = true;
> +
> + /* Update mst mgr info */
> + if (mgr->payload_count == 0)
> + mgr->next_start_slot = mst_state->start_slot;
> +
> + payload->vc_start_slot = mgr->next_start_slot;
> +
> + mgr->payload_count++;
> + mgr->next_start_slot += payload->time_slots;
>
> + /* Allocate payload to immediate downstream facing port */
> port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
> if (!port) {
> drm_dbg_kms(mgr->dev,
> - "VCPI %d for port %p not in topology, not creating a payload\n",
> + "VCPI %d for port %p not in topology, not creating a payload to remote\n",
> payload->vcpi, payload->port);
> - payload->vc_start_slot = -1;
> - return 0;
> + allocate = false;
> }
>
> - if (mgr->payload_count == 0)
> - mgr->next_start_slot = mst_state->start_slot;
> -
> - payload->vc_start_slot = mgr->next_start_slot;
> + if (allocate) {
> + ret = drm_dp_create_payload_at_dfp(mgr, payload);
> + if (ret < 0)
> + drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n",
> + payload->port, ret);
>
> - ret = drm_dp_create_payload_step1(mgr, payload);
> - drm_dp_mst_topology_put_port(port);
> - if (ret < 0) {
> - drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n",
> - payload->port, ret);
> - payload->vc_start_slot = -1;
> - return ret;
> }
>
> - mgr->payload_count++;
> - mgr->next_start_slot += payload->time_slots;
> + payload->payload_allocation_status =
> + (!allocate || ret < 0) ? DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL :
> + DRM_DP_MST_PAYLOAD_ALLOCATION_DFP;
Just need to fix indenting here
>
> - return 0;
> + drm_dp_mst_topology_put_port(port);
> +
> + return ret;
> }
> EXPORT_SYMBOL(drm_dp_add_payload_part1);
>
> /**
> - * drm_dp_remove_payload() - Remove an MST payload
> + * drm_dp_remove_payload_part1() - Remove an MST payload along the virtual channel
> * @mgr: Manager to use.
> * @mst_state: The MST atomic state
> - * @old_payload: The payload with its old state
> - * @new_payload: The payload to write
> + * @payload: The payload to remove
> *
> - * Removes a payload from an MST topology if it was successfully assigned a start slot. Also updates
> - * the starting time slots of all other payloads which would have been shifted towards the start of
> - * the VC table as a result. After calling this, the driver should generate ACT and payload packets.
> + * Removes a payload along the virtual channel if it was successfully allocated.
> + * After calling this, the driver should set HW to generate ACT and then switch to new
> + * payload allocation state.
> */
> -void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,
> - struct drm_dp_mst_topology_state *mst_state,
> - const struct drm_dp_mst_atomic_payload *old_payload,
> - struct drm_dp_mst_atomic_payload *new_payload)
> +void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_topology_state *mst_state,
> + struct drm_dp_mst_atomic_payload *payload)
> {
> - struct drm_dp_mst_atomic_payload *pos;
> + /* Remove remote payload allocation */
> bool send_remove = false;
>
> - /* We failed to make the payload, so nothing to do */
> - if (new_payload->vc_start_slot == -1)
> - return;
> -
> mutex_lock(&mgr->lock);
> - send_remove = drm_dp_mst_port_downstream_of_branch(new_payload->port, mgr->mst_primary);
> + send_remove = drm_dp_mst_port_downstream_of_branch(payload->port, mgr->mst_primary);
> mutex_unlock(&mgr->lock);
>
> if (send_remove)
> - drm_dp_destroy_payload_step1(mgr, mst_state, new_payload);
> + drm_dp_destroy_payload_at_remote_and_dfp(mgr, mst_state, payload);
> else
> drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n",
> - new_payload->vcpi);
> + payload->vcpi);
> +
> + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL;
> +}
> +EXPORT_SYMBOL(drm_dp_remove_payload_part1);
>
> +/**
> + * drm_dp_remove_payload_part2() - Remove an MST payload locally
> + * @mgr: Manager to use.
> + * @mst_state: The MST atomic state
> + * @old_payload: The payload with its old state
> + * @new_payload: The payload with its latest state
> + *
> + * Updates the starting time slots of all other payloads which would have been shifted towards
> + * the start of the payload ID table as a result of removing a payload. Driver should call this
> + * function whenever it removes a payload in its HW. It's independent to the result of payload
> + * allocation/deallocation at branch devices along the virtual channel.
> + */
> +void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_topology_state *mst_state,
> + const struct drm_dp_mst_atomic_payload *old_payload,
> + struct drm_dp_mst_atomic_payload *new_payload)
> +{
> + struct drm_dp_mst_atomic_payload *pos;
> +
> + /* Remove local payload allocation */
> list_for_each_entry(pos, &mst_state->payloads, next) {
> if (pos != new_payload && pos->vc_start_slot > new_payload->vc_start_slot)
> pos->vc_start_slot -= old_payload->time_slots;
> @@ -3382,9 +3409,10 @@ void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,
>
> if (new_payload->delete)
> drm_dp_mst_put_port_malloc(new_payload->port);
> -}
> -EXPORT_SYMBOL(drm_dp_remove_payload);
>
> + new_payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE;
> +}
> +EXPORT_SYMBOL(drm_dp_remove_payload_part2);
> /**
> * drm_dp_add_payload_part2() - Execute payload update part 2
> * @mgr: Manager to use.
> @@ -3403,17 +3431,19 @@ int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
> int ret = 0;
>
> /* Skip failed payloads */
> - if (payload->vc_start_slot == -1) {
> - drm_dbg_kms(mgr->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",
> + if (payload->payload_allocation_status != DRM_DP_MST_PAYLOAD_ALLOCATION_DFP) {
> + drm_dbg_kms(state->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",
> payload->port->connector->name);
> return -EIO;
> }
>
> - ret = drm_dp_create_payload_step2(mgr, payload);
> - if (ret < 0) {
> + /* Allocate payload to remote end */
> + ret = drm_dp_create_payload_to_remote(mgr, payload);
> + if (ret < 0)
> drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",
> payload->port, ret);
> - }
> + else
> + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE;
>
> return ret;
> }
> @@ -4324,6 +4354,7 @@ int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
> drm_dp_mst_get_port_malloc(port);
> payload->port = port;
> payload->vc_start_slot = -1;
> + payload->payload_allocation_status = DRM_DP_MST_PAYLOAD_ALLOCATION_NONE;
> list_add(&payload->next, &topology_state->payloads);
> }
> payload->time_slots = req_slots;
> @@ -4493,7 +4524,7 @@ void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state)
> }
>
> /* Now that previous state is committed, it's safe to copy over the start slot
> - * assignments
> + * and allocation status assignments
> */
> list_for_each_entry(old_payload, &old_mst_state->payloads, next) {
> if (old_payload->delete)
> @@ -4502,6 +4533,8 @@ void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state)
> new_payload = drm_atomic_get_mst_payload_state(new_mst_state,
> old_payload->port);
> new_payload->vc_start_slot = old_payload->vc_start_slot;
> + new_payload->payload_allocation_status =
> + old_payload->payload_allocation_status;
And here. Besides that, I think patches 1/3 and 2/3 look great! Just finished
testing them on nouveau:
Reviewed-by: Lyude Paul <lyude at redhat.com>
Patch 3/3 I gotta think about a bit more (and am curious about Imre's current
take on it) I think
> }
> }
> }
> @@ -4818,6 +4851,13 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
> struct drm_dp_mst_atomic_payload *payload;
> int i, ret;
>
> + static const char *const status[] = {
> + "None",
> + "Local",
> + "DFP",
> + "Remote",
> + };
> +
> mutex_lock(&mgr->lock);
> if (mgr->mst_primary)
> drm_dp_mst_dump_mstb(m, mgr->mst_primary);
> @@ -4834,7 +4874,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
> seq_printf(m, "payload_mask: %x, max_payloads: %d, start_slot: %u, pbn_div: %d\n",
> state->payload_mask, mgr->max_payloads, state->start_slot, state->pbn_div);
>
> - seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | sink name |\n");
> + seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | status | sink name |\n");
> for (i = 0; i < mgr->max_payloads; i++) {
> list_for_each_entry(payload, &state->payloads, next) {
> char name[14];
> @@ -4843,7 +4883,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
> continue;
>
> fetch_monitor_name(mgr, payload->port, name, sizeof(name));
> - seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %19s\n",
> + seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %8s %19s\n",
> i,
> payload->port->port_num,
> payload->vcpi,
> @@ -4851,6 +4891,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
> payload->vc_start_slot + payload->time_slots - 1,
> payload->pbn,
> payload->dsc_enabled ? "Y" : "N",
> + status[payload->payload_allocation_status],
> (*name != 0) ? name : "Unknown");
> }
> }
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index e3f176a093d2..5f73cdabe7a1 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -557,12 +557,8 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
> struct intel_dp *intel_dp = &dig_port->dp;
> struct intel_connector *connector =
> to_intel_connector(old_conn_state->connector);
> - struct drm_dp_mst_topology_state *old_mst_state =
> - drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
> struct drm_dp_mst_topology_state *new_mst_state =
> drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
> - const struct drm_dp_mst_atomic_payload *old_payload =
> - drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
> struct drm_dp_mst_atomic_payload *new_payload =
> drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
> struct drm_i915_private *i915 = to_i915(connector->base.dev);
> @@ -572,8 +568,7 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
>
> intel_hdcp_disable(intel_mst->connector);
>
> - drm_dp_remove_payload(&intel_dp->mst_mgr, new_mst_state,
> - old_payload, new_payload);
> + drm_dp_remove_payload_part1(&intel_dp->mst_mgr, new_mst_state, new_payload);
>
> intel_audio_codec_disable(encoder, old_crtc_state, old_conn_state);
> }
> @@ -588,6 +583,14 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
> struct intel_dp *intel_dp = &dig_port->dp;
> struct intel_connector *connector =
> to_intel_connector(old_conn_state->connector);
> + struct drm_dp_mst_topology_state *old_mst_state =
> + drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
> + struct drm_dp_mst_topology_state *new_mst_state =
> + drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
> + const struct drm_dp_mst_atomic_payload *old_payload =
> + drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
> + struct drm_dp_mst_atomic_payload *new_payload =
> + drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
> struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> bool last_mst_stream;
>
> @@ -608,6 +611,9 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
>
> wait_for_act_sent(encoder, old_crtc_state);
>
> + drm_dp_remove_payload_part2(&intel_dp->mst_mgr, new_mst_state,
> + old_payload, new_payload);
> +
> intel_ddi_disable_transcoder_func(old_crtc_state);
>
> if (DISPLAY_VER(dev_priv) >= 9)
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index 4e7c9c353c51..bba01fa0780c 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -882,21 +882,26 @@ struct nouveau_encoder *nv50_real_outp(struct drm_encoder *encoder)
>
> static void
> nv50_msto_cleanup(struct drm_atomic_state *state,
> - struct drm_dp_mst_topology_state *mst_state,
> + struct drm_dp_mst_topology_state *new_mst_state,
> struct drm_dp_mst_topology_mgr *mgr,
> struct nv50_msto *msto)
> {
> struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
> - struct drm_dp_mst_atomic_payload *payload =
> - drm_atomic_get_mst_payload_state(mst_state, msto->mstc->port);
> + struct drm_dp_mst_atomic_payload *new_payload =
> + drm_atomic_get_mst_payload_state(new_mst_state, msto->mstc->port);
> + struct drm_dp_mst_topology_state *old_mst_state =
> + drm_atomic_get_old_mst_topology_state(state, mgr);
> + const struct drm_dp_mst_atomic_payload *old_payload =
> + drm_atomic_get_mst_payload_state(old_mst_state, msto->mstc->port);
>
> NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name);
>
> if (msto->disabled) {
> msto->mstc = NULL;
> msto->disabled = false;
> + drm_dp_remove_payload_part2(mgr, new_mst_state, old_payload, new_payload);
> } else if (msto->enabled) {
> - drm_dp_add_payload_part2(mgr, state, payload);
> + drm_dp_add_payload_part2(mgr, state, new_payload);
> msto->enabled = false;
> }
> }
> @@ -910,19 +915,15 @@ nv50_msto_prepare(struct drm_atomic_state *state,
> struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev);
> struct nv50_mstc *mstc = msto->mstc;
> struct nv50_mstm *mstm = mstc->mstm;
> - struct drm_dp_mst_topology_state *old_mst_state;
> - struct drm_dp_mst_atomic_payload *payload, *old_payload;
> + struct drm_dp_mst_atomic_payload *payload;
>
> NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);
>
> - old_mst_state = drm_atomic_get_old_mst_topology_state(state, mgr);
> -
> payload = drm_atomic_get_mst_payload_state(mst_state, mstc->port);
> - old_payload = drm_atomic_get_mst_payload_state(old_mst_state, mstc->port);
>
> // TODO: Figure out if we want to do a better job of handling VCPI allocation failures here?
> if (msto->disabled) {
> - drm_dp_remove_payload(mgr, mst_state, old_payload, payload);
> + drm_dp_remove_payload_part1(mgr, mst_state, payload);
>
> nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0);
> } else {
> diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
> index ed5c9660563c..4429d3b1745b 100644
> --- a/include/drm/display/drm_dp_mst_helper.h
> +++ b/include/drm/display/drm_dp_mst_helper.h
> @@ -46,6 +46,13 @@ struct drm_dp_mst_topology_ref_history {
> };
> #endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */
>
> +enum drm_dp_mst_payload_allocation {
> + DRM_DP_MST_PAYLOAD_ALLOCATION_NONE,
> + DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL,
> + DRM_DP_MST_PAYLOAD_ALLOCATION_DFP,
> + DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE,
> +};
> +
> struct drm_dp_mst_branch;
>
> /**
> @@ -537,7 +544,7 @@ struct drm_dp_mst_atomic_payload {
> * drm_dp_mst_atomic_wait_for_dependencies() has been called, which will ensure the
> * previous MST states payload start slots have been copied over to the new state. Note
> * that a new start slot won't be assigned/removed from this payload until
> - * drm_dp_add_payload_part1()/drm_dp_remove_payload() have been called.
> + * drm_dp_add_payload_part1()/drm_dp_remove_payload_part2() have been called.
> * * Acquire the MST modesetting lock, and then wait for any pending MST-related commits to
> * get committed to hardware by calling drm_crtc_commit_wait() on each of the
> * &drm_crtc_commit structs in &drm_dp_mst_topology_state.commit_deps.
> @@ -564,6 +571,9 @@ struct drm_dp_mst_atomic_payload {
> /** @dsc_enabled: Whether or not this payload has DSC enabled */
> bool dsc_enabled : 1;
>
> + /** @payload_allocation_status: The allocation status of this payload */
> + enum drm_dp_mst_payload_allocation payload_allocation_status;
> +
> /** @next: The list node for this payload */
> struct list_head next;
> };
> @@ -842,10 +852,13 @@ int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
> int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
> struct drm_atomic_state *state,
> struct drm_dp_mst_atomic_payload *payload);
> -void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,
> - struct drm_dp_mst_topology_state *mst_state,
> - const struct drm_dp_mst_atomic_payload *old_payload,
> - struct drm_dp_mst_atomic_payload *new_payload);
> +void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_topology_state *mst_state,
> + struct drm_dp_mst_atomic_payload *payload);
> +void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
> + struct drm_dp_mst_topology_state *mst_state,
> + const struct drm_dp_mst_atomic_payload *old_payload,
> + struct drm_dp_mst_atomic_payload *new_payload);
>
> int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
>
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
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