[PATCH 3/4] drm/amd/display: Add DP 2.0 MST DC Support

Lin, Wayne Wayne.Lin at amd.com
Fri Oct 22 08:46:54 UTC 2021


[Public]

Hi Bhawan,
It looks good to me. Thanks!
Reviewed-by: Wayne Lin <Wayne.Lin at amd.com>

Regards,
Wayne
> -----Original Message-----
> From: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
> Sent: Thursday, October 21, 2021 11:16 PM
> To: Zuo, Jerry <Jerry.Zuo at amd.com>; dri-devel at lists.freedesktop.org; lyude at redhat.com
> Cc: intel-gfx at lists.freedesktop.org; Wentland, Harry <Harry.Wentland at amd.com>; Lin, Wayne <Wayne.Lin at amd.com>; Kazlauskas,
> Nicholas <Nicholas.Kazlauskas at amd.com>; Lipski, Mikita <Mikita.Lipski at amd.com>; Lakha, Bhawanpreet
> <Bhawanpreet.Lakha at amd.com>
> Subject: [PATCH 3/4] drm/amd/display: Add DP 2.0 MST DC Support
>
> From: Fangzhi Zuo <Jerry.Zuo at amd.com>
>
> [Why]
> configure/call DC interface for DP2 mst support. This is needed to make DP2 mst work.
>
> [How]
> - add encoding type, logging, mst update/reduce payload functions
>
> Use the link encoding to determine the DP type (1.4 or 2.0) and add a flag to dc_stream_update to determine whether to increase/reduce
> payloads.
>
> v2:
> * add DP_UNKNOWN_ENCODING handling
>
> Signed-off-by: Fangzhi Zuo <Jerry.Zuo at amd.com>
> Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
> ---
>  drivers/gpu/drm/amd/display/dc/core/dc.c      |  14 +
>  drivers/gpu/drm/amd/display/dc/core/dc_link.c | 292 ++++++++++++++++++  .../gpu/drm/amd/display/dc/core/dc_link_dp.c  |  19 ++
>  drivers/gpu/drm/amd/display/dc/dc_link.h      |   7 +
>  drivers/gpu/drm/amd/display/dc/dc_stream.h    |  13 +
>  5 files changed, 345 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
> index 8be04be19124..935a50d6e933 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
> @@ -2354,6 +2354,11 @@ static enum surface_update_type check_update_surfaces_for_stream(
>               if (stream_update->dsc_config)
>                       su_flags->bits.dsc_changed = 1;
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +             if (stream_update->mst_bw_update)
> +                     su_flags->bits.mst_bw = 1;
> +#endif
> +
>               if (su_flags->raw != 0)
>                       overall_type = UPDATE_TYPE_FULL;
>
> @@ -2731,6 +2736,15 @@ static void commit_planes_do_stream_update(struct dc *dc,
>                       if (stream_update->dsc_config)
>                               dp_update_dsc_config(pipe_ctx);
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +                     if (stream_update->mst_bw_update) {
> +                             if (stream_update->mst_bw_update->is_increase)
> +                                     dc_link_increase_mst_payload(pipe_ctx, stream_update->mst_bw_update->mst_stream_bw);
> +                             else
> +                                     dc_link_reduce_mst_payload(pipe_ctx, stream_update->mst_bw_update->mst_stream_bw);
> +                     }
> +#endif
> +
>                       if (stream_update->pending_test_pattern) {
>                               dc_link_dp_set_test_pattern(stream->link,
>                                       stream->test_pattern.type,
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> index e5d6cbd7ea78..ec5f107bc85a 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> @@ -3232,6 +3232,9 @@ static struct fixed31_32 get_pbn_from_timing(struct pipe_ctx *pipe_ctx)  static void
> update_mst_stream_alloc_table(
>       struct dc_link *link,
>       struct stream_encoder *stream_enc,
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     struct hpo_dp_stream_encoder *hpo_dp_stream_enc, // TODO: Rename stream_enc to dio_stream_enc?
> +#endif
>       const struct dp_mst_stream_allocation_table *proposed_table)  {
>       struct link_mst_stream_allocation work_table[MAX_CONTROLLER_NUM] = { 0 }; @@ -3267,6 +3270,9 @@ static void
> update_mst_stream_alloc_table(
>                       work_table[i].slot_count =
>                               proposed_table->stream_allocations[i].slot_count;
>                       work_table[i].stream_enc = stream_enc;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +                     work_table[i].hpo_dp_stream_enc = hpo_dp_stream_enc; #endif
>               }
>       }
>
> @@ -3389,6 +3395,10 @@ enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx)
>       struct dc_link *link = stream->link;
>       struct link_encoder *link_encoder = NULL;
>       struct stream_encoder *stream_encoder = pipe_ctx->stream_res.stream_enc;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     struct hpo_dp_link_encoder *hpo_dp_link_encoder = link->hpo_dp_link_enc;
> +     struct hpo_dp_stream_encoder *hpo_dp_stream_encoder =
> +pipe_ctx->stream_res.hpo_dp_stream_enc;
> +#endif
>       struct dp_mst_stream_allocation_table proposed_table = {0};
>       struct fixed31_32 avg_time_slots_per_mtp;
>       struct fixed31_32 pbn;
> @@ -3416,7 +3426,14 @@ enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx)
>               &proposed_table,
>               true)) {
>               update_mst_stream_alloc_table(
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +                                     link,
> +                                     pipe_ctx->stream_res.stream_enc,
> +                                     pipe_ctx->stream_res.hpo_dp_stream_enc,
> +                                     &proposed_table);
> +#else
>                                       link, pipe_ctx->stream_res.stream_enc, &proposed_table);
> +#endif
>       }
>       else
>               DC_LOG_WARNING("Failed to update"
> @@ -3430,23 +3447,56 @@ enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx)
>                       link->mst_stream_alloc_table.stream_count);
>
>       for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
>               DC_LOG_MST("stream_enc[%d]: %p      "
> +             "stream[%d].hpo_dp_stream_enc: %p      "
>               "stream[%d].vcp_id: %d      "
>               "stream[%d].slot_count: %d\n",
>               i,
>               (void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
>               i,
> +             (void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
> +             i,
>               link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
>               i,
>               link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +#else
> +             DC_LOG_MST("stream_enc[%d]: %p      "
> +             "stream[%d].vcp_id: %d      "
> +             "stream[%d].slot_count: %d\n",
> +             i,
> +             (void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
> +             i,
> +             link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
> +             i,
> +             link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +#endif
>       }
>
>       ASSERT(proposed_table.stream_count > 0);
>
>       /* program DP source TX for payload */
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     switch (dp_get_link_encoding_format(&link->cur_link_settings)) {
> +     case DP_8b_10b_ENCODING:
> +             link_encoder->funcs->update_mst_stream_allocation_table(
> +                     link_encoder,
> +                     &link->mst_stream_alloc_table);
> +             break;
> +     case DP_128b_132b_ENCODING:
> +             hpo_dp_link_encoder->funcs->update_stream_allocation_table(
> +                             hpo_dp_link_encoder,
> +                             &link->mst_stream_alloc_table);
> +             break;
> +     case DP_UNKNOWN_ENCODING:
> +             DC_LOG_ERROR("Failure: unknown encoding format\n");
> +             return DC_ERROR_UNEXPECTED;
> +     }
> +#else
>       link_encoder->funcs->update_mst_stream_allocation_table(
>               link_encoder,
>               &link->mst_stream_alloc_table);
> +#endif
>
>       /* send down message */
>       ret = dm_helpers_dp_mst_poll_for_allocation_change_trigger(
> @@ -3469,13 +3519,191 @@ enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx)
>       pbn = get_pbn_from_timing(pipe_ctx);
>       avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     switch (dp_get_link_encoding_format(&link->cur_link_settings)) {
> +     case DP_8b_10b_ENCODING:
> +             stream_encoder->funcs->set_throttled_vcp_size(
> +                     stream_encoder,
> +                     avg_time_slots_per_mtp);
> +             break;
> +     case DP_128b_132b_ENCODING:
> +             hpo_dp_link_encoder->funcs->set_throttled_vcp_size(
> +                             hpo_dp_link_encoder,
> +                             hpo_dp_stream_encoder->inst,
> +                             avg_time_slots_per_mtp);
> +             break;
> +     case DP_UNKNOWN_ENCODING:
> +             DC_LOG_ERROR("Failure: unknown encoding format\n");
> +             return DC_ERROR_UNEXPECTED;
> +     }
> +#else
>       stream_encoder->funcs->set_throttled_vcp_size(
>               stream_encoder,
>               avg_time_slots_per_mtp);
> +#endif
> +
> +     return DC_OK;
> +
> +}
> +
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +enum dc_status dc_link_reduce_mst_payload(struct pipe_ctx *pipe_ctx,
> +uint32_t bw_in_kbps) {
> +     struct dc_stream_state *stream = pipe_ctx->stream;
> +     struct dc_link *link = stream->link;
> +     struct fixed31_32 avg_time_slots_per_mtp;
> +     struct fixed31_32 pbn;
> +     struct fixed31_32 pbn_per_slot;
> +     struct link_encoder *link_encoder = link->link_enc;
> +     struct stream_encoder *stream_encoder = pipe_ctx->stream_res.stream_enc;
> +     struct dp_mst_stream_allocation_table proposed_table = {0};
> +     uint8_t i;
> +     enum act_return_status ret;
> +     DC_LOGGER_INIT(link->ctx->logger);
> +
> +     /* decrease throttled vcp size */
> +     pbn_per_slot = get_pbn_per_slot(stream);
> +     pbn = get_pbn_from_bw_in_kbps(bw_in_kbps);
> +     avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);
> +
> +     stream_encoder->funcs->set_throttled_vcp_size(
> +                             stream_encoder,
> +                             avg_time_slots_per_mtp);
> +
> +     /* send ALLOCATE_PAYLOAD sideband message with updated pbn */
> +     dm_helpers_dp_mst_send_payload_allocation(
> +                     stream->ctx,
> +                     stream,
> +                     true);
> +
> +     /* notify immediate branch device table update */
> +     if (dm_helpers_dp_mst_write_payload_allocation_table(
> +                     stream->ctx,
> +                     stream,
> +                     &proposed_table,
> +                     true)) {
> +             /* update mst stream allocation table software state */
> +             update_mst_stream_alloc_table(
> +                             link,
> +                             pipe_ctx->stream_res.stream_enc,
> +                             pipe_ctx->stream_res.hpo_dp_stream_enc,
> +                             &proposed_table);
> +     } else {
> +             DC_LOG_WARNING("Failed to update"
> +                             "MST allocation table for"
> +                             "pipe idx:%d\n",
> +                             pipe_ctx->pipe_idx);
> +     }
> +
> +     DC_LOG_MST("%s  "
> +                     "stream_count: %d: \n ",
> +                     __func__,
> +                     link->mst_stream_alloc_table.stream_count);
> +
> +     for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
> +             DC_LOG_MST("stream_enc[%d]: %p      "
> +                             "stream[%d].vcp_id: %d      "
> +                             "stream[%d].slot_count: %d\n",
> +                             i,
> +                             (void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
> +                             i,
> +                             link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
> +                             i,
> +                             link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +     }
> +
> +     ASSERT(proposed_table.stream_count > 0);
> +
> +     /* update mst stream allocation table hardware state */
> +     link_encoder->funcs->update_mst_stream_allocation_table(
> +                     link_encoder,
> +                     &link->mst_stream_alloc_table);
> +
> +     /* poll for immediate branch device ACT handled */
> +     ret = dm_helpers_dp_mst_poll_for_allocation_change_trigger(
> +                     stream->ctx,
> +                     stream);
>
>       return DC_OK;
> +}
> +
> +enum dc_status dc_link_increase_mst_payload(struct pipe_ctx *pipe_ctx,
> +uint32_t bw_in_kbps) {
> +     struct dc_stream_state *stream = pipe_ctx->stream;
> +     struct dc_link *link = stream->link;
> +     struct fixed31_32 avg_time_slots_per_mtp;
> +     struct fixed31_32 pbn;
> +     struct fixed31_32 pbn_per_slot;
> +     struct link_encoder *link_encoder = link->link_enc;
> +     struct stream_encoder *stream_encoder = pipe_ctx->stream_res.stream_enc;
> +     struct dp_mst_stream_allocation_table proposed_table = {0};
> +     uint8_t i;
> +     enum act_return_status ret;
> +     DC_LOGGER_INIT(link->ctx->logger);
> +
> +     /* notify immediate branch device table update */
> +     if (dm_helpers_dp_mst_write_payload_allocation_table(
> +                             stream->ctx,
> +                             stream,
> +                             &proposed_table,
> +                             true)) {
> +             /* update mst stream allocation table software state */
> +             update_mst_stream_alloc_table(
> +                             link,
> +                             pipe_ctx->stream_res.stream_enc,
> +                             pipe_ctx->stream_res.hpo_dp_stream_enc,
> +                             &proposed_table);
> +     }
> +
> +     DC_LOG_MST("%s  "
> +                     "stream_count: %d: \n ",
> +                     __func__,
> +                     link->mst_stream_alloc_table.stream_count);
> +
> +     for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
> +             DC_LOG_MST("stream_enc[%d]: %p      "
> +                             "stream[%d].vcp_id: %d      "
> +                             "stream[%d].slot_count: %d\n",
> +                             i,
> +                             (void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
> +                             i,
> +                             link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
> +                             i,
> +                             link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +     }
> +
> +     ASSERT(proposed_table.stream_count > 0);
> +
> +     /* update mst stream allocation table hardware state */
> +     link_encoder->funcs->update_mst_stream_allocation_table(
> +                     link_encoder,
> +                     &link->mst_stream_alloc_table);
> +
> +     /* poll for immediate branch device ACT handled */
> +     ret = dm_helpers_dp_mst_poll_for_allocation_change_trigger(
> +                     stream->ctx,
> +                     stream);
> +
> +     if (ret != ACT_LINK_LOST) {
> +             /* send ALLOCATE_PAYLOAD sideband message with updated pbn */
> +             dm_helpers_dp_mst_send_payload_allocation(
> +                             stream->ctx,
> +                             stream,
> +                             true);
> +     }
>
> +     /* increase throttled vcp size */
> +     pbn = get_pbn_from_bw_in_kbps(bw_in_kbps);
> +     pbn_per_slot = get_pbn_per_slot(stream);
> +     avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);
> +
> +     stream_encoder->funcs->set_throttled_vcp_size(
> +                             stream_encoder,
> +                             avg_time_slots_per_mtp);
> +
> +     return DC_OK;
>  }
> +#endif
>
>  static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)  { @@ -3483,6 +3711,10 @@ static enum dc_status
> deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
>       struct dc_link *link = stream->link;
>       struct link_encoder *link_encoder = NULL;
>       struct stream_encoder *stream_encoder = pipe_ctx->stream_res.stream_enc;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     struct hpo_dp_link_encoder *hpo_dp_link_encoder = link->hpo_dp_link_enc;
> +     struct hpo_dp_stream_encoder *hpo_dp_stream_encoder =
> +pipe_ctx->stream_res.hpo_dp_stream_enc;
> +#endif
>       struct dp_mst_stream_allocation_table proposed_table = {0};
>       struct fixed31_32 avg_time_slots_per_mtp = dc_fixpt_from_int(0);
>       int i;
> @@ -3504,9 +3736,28 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
>        */
>
>       /* slot X.Y */
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     switch (dp_get_link_encoding_format(&link->cur_link_settings)) {
> +     case DP_8b_10b_ENCODING:
> +             stream_encoder->funcs->set_throttled_vcp_size(
> +                     stream_encoder,
> +                     avg_time_slots_per_mtp);
> +             break;
> +     case DP_128b_132b_ENCODING:
> +             hpo_dp_link_encoder->funcs->set_throttled_vcp_size(
> +                             hpo_dp_link_encoder,
> +                             hpo_dp_stream_encoder->inst,
> +                             avg_time_slots_per_mtp);
> +             break;
> +     case DP_UNKNOWN_ENCODING:
> +             DC_LOG_ERROR("Failure: unknown encoding format\n");
> +             return DC_ERROR_UNEXPECTED;
> +     }
> +#else
>       stream_encoder->funcs->set_throttled_vcp_size(
>               stream_encoder,
>               avg_time_slots_per_mtp);
> +#endif
>
>       /* TODO: which component is responsible for remove payload table? */
>       if (mst_mode) {
> @@ -3516,8 +3767,16 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
>                               &proposed_table,
>                               false)) {
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +                     update_mst_stream_alloc_table(
> +                                             link,
> +                                             pipe_ctx->stream_res.stream_enc,
> +                                             pipe_ctx->stream_res.hpo_dp_stream_enc,
> +                                             &proposed_table);
> +#else
>                       update_mst_stream_alloc_table(
>                               link, pipe_ctx->stream_res.stream_enc, &proposed_table);
> +#endif
>               }
>               else {
>                               DC_LOG_WARNING("Failed to update"
> @@ -3533,6 +3792,20 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
>                       link->mst_stream_alloc_table.stream_count);
>
>       for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +             DC_LOG_MST("stream_enc[%d]: %p      "
> +             "stream[%d].hpo_dp_stream_enc: %p      "
> +             "stream[%d].vcp_id: %d      "
> +             "stream[%d].slot_count: %d\n",
> +             i,
> +             (void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
> +             i,
> +             (void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
> +             i,
> +             link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
> +             i,
> +             link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +#else
>               DC_LOG_MST("stream_enc[%d]: %p      "
>               "stream[%d].vcp_id: %d      "
>               "stream[%d].slot_count: %d\n",
> @@ -3542,11 +3815,30 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
>               link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
>               i,
>               link->mst_stream_alloc_table.stream_allocations[i].slot_count);
> +#endif
>       }
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     switch (dp_get_link_encoding_format(&link->cur_link_settings)) {
> +     case DP_8b_10b_ENCODING:
> +             link_encoder->funcs->update_mst_stream_allocation_table(
> +                     link_encoder,
> +                     &link->mst_stream_alloc_table);
> +             break;
> +     case DP_128b_132b_ENCODING:
> +             hpo_dp_link_encoder->funcs->update_stream_allocation_table(
> +                             hpo_dp_link_encoder,
> +                             &link->mst_stream_alloc_table);
> +             break;
> +     case DP_UNKNOWN_ENCODING:
> +             DC_LOG_ERROR("Failure: unknown encoding format\n");
> +             return DC_ERROR_UNEXPECTED;
> +     }
> +#else
>       link_encoder->funcs->update_mst_stream_allocation_table(
>               link_encoder,
>               &link->mst_stream_alloc_table);
> +#endif
>
>       if (mst_mode) {
>               dm_helpers_dp_mst_poll_for_allocation_change_trigger(
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> index 296b0defcd1c..bb96e4e9ccfc 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> @@ -5993,6 +5993,25 @@ enum dp_link_encoding dp_get_link_encoding_format(const struct dc_link_settings  }
>
>  #if defined(CONFIG_DRM_AMD_DC_DCN)
> +enum dp_link_encoding dc_link_dp_mst_decide_link_encoding_format(const
> +struct dc_link *link) {
> +     struct dc_link_settings link_settings = {0};
> +
> +     if (!dc_is_dp_signal(link->connector_signal))
> +             return DP_UNKNOWN_ENCODING;
> +
> +     if (link->preferred_link_setting.lane_count !=
> +                     LANE_COUNT_UNKNOWN &&
> +                     link->preferred_link_setting.link_rate !=
> +                                     LINK_RATE_UNKNOWN) {
> +             link_settings = link->preferred_link_setting;
> +     } else {
> +             decide_mst_link_settings(link, &link_settings);
> +     }
> +
> +     return dp_get_link_encoding_format(&link_settings);
> +}
> +
>  // TODO - DP2.0 Link: Fix get_lane_status to handle LTTPR offset (SST and MST)  static void get_lane_status(
>       struct dc_link *link,
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
> index a73d64b1fd33..08815310d85b 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_link.h
> +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
> @@ -295,6 +295,10 @@ enum dc_detect_reason {  bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);  bool
> dc_link_get_hpd_state(struct dc_link *dc_link);  enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx);
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +enum dc_status dc_link_reduce_mst_payload(struct pipe_ctx *pipe_ctx,
> +uint32_t req_pbn); enum dc_status dc_link_increase_mst_payload(struct
> +pipe_ctx *pipe_ctx, uint32_t req_pbn); #endif
>
>  /* Notify DC about DP RX Interrupt (aka Short Pulse Interrupt).
>   * Return:
> @@ -424,4 +428,7 @@ uint32_t dc_bandwidth_in_kbps_from_timing(  bool dc_link_is_fec_supported(const struct dc_link *link);  bool
> dc_link_should_enable_fec(const struct dc_link *link);
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +enum dp_link_encoding dc_link_dp_mst_decide_link_encoding_format(const
> +struct dc_link *link); #endif
>  #endif /* DC_LINK_H_ */
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
> index b8ebc1f09538..e37c4a10bfd5 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
> +++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
> @@ -115,6 +115,13 @@ struct periodic_interrupt_config {
>       int lines_offset;
>  };
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +struct dc_mst_stream_bw_update {
> +     bool is_increase; // is bandwidth reduced or increased
> +     uint32_t mst_stream_bw; // new mst bandwidth in kbps }; #endif
> +
>  union stream_update_flags {
>       struct {
>               uint32_t scaling:1;
> @@ -125,6 +132,9 @@ union stream_update_flags {
>               uint32_t gamut_remap:1;
>               uint32_t wb_update:1;
>               uint32_t dsc_changed : 1;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +             uint32_t mst_bw : 1;
> +#endif
>       } bits;
>
>       uint32_t raw;
> @@ -278,6 +288,9 @@ struct dc_stream_update {
>
>       struct dc_writeback_update *wb_update;
>       struct dc_dsc_config *dsc_config;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> +     struct dc_mst_stream_bw_update *mst_bw_update; #endif
>       struct dc_transfer_func *func_shaper;
>       struct dc_3dlut *lut3d_func;
>
> --
> 2.25.1



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