diff options
author | Jimmy Kizito <Jimmy.Kizito@amd.com> | 2021-08-10 19:07:43 -0400 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2021-09-14 15:57:09 -0400 |
commit | 64d283cb379eadcb412ebba3b61808b58d0c6193 (patch) | |
tree | 9166eab38ab708baceb6244936a9cdf52a325d0d /drivers | |
parent | 035f54969bb2c1a5ced52f43e4ef393e0c0f6bfa (diff) | |
download | linux-stable-64d283cb379eadcb412ebba3b61808b58d0c6193.tar.gz linux-stable-64d283cb379eadcb412ebba3b61808b58d0c6193.tar.bz2 linux-stable-64d283cb379eadcb412ebba3b61808b58d0c6193.zip |
drm/amd/display: Fix dynamic link encoder access.
[Why]
Assuming DIG link encoders are statically mapped to links can cause
system instability due to null pointer accesses.
[How]
- Add checks for non-null link encoder pointers before trying to access
them.
- When a hardware platform uses dynamic DIG assignment (i.e. resource
function 'link_encs_assign' defined) and a link supports flexible
mapping to DIGs, use the link_enc_cfg API to access the DIG assigned to
a link or stream.
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
12 files changed, 147 insertions, 39 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c index 15491e3ca11a..1414da4b95d7 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c @@ -87,7 +87,7 @@ int dcn31_get_active_display_cnt_wa( const struct dc_link *link = dc->links[i]; /* abusing the fact that the dig and phy are coupled to see if the phy is enabled */ - if (link->link_enc->funcs->is_dig_enabled && + if (link->link_enc && link->link_enc->funcs->is_dig_enabled && link->link_enc->funcs->is_dig_enabled(link->link_enc)) display_count++; } 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 5d9460e0dbab..3c8eb3e659af 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -3457,6 +3457,10 @@ static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx) static void update_psp_stream_config(struct pipe_ctx *pipe_ctx, bool dpms_off) { struct cp_psp *cp_psp = &pipe_ctx->stream->ctx->cp_psp; +#if defined(CONFIG_DRM_AMD_DC_DCN) + struct link_encoder *link_enc = NULL; +#endif + if (cp_psp && cp_psp->funcs.update_stream_config) { struct cp_psp_stream_config config = {0}; enum dp_panel_mode panel_mode = @@ -3468,8 +3472,21 @@ static void update_psp_stream_config(struct pipe_ctx *pipe_ctx, bool dpms_off) config.dig_be = pipe_ctx->stream->link->link_enc_hw_inst; #if defined(CONFIG_DRM_AMD_DC_DCN) config.stream_enc_idx = pipe_ctx->stream_res.stream_enc->id - ENGINE_ID_DIGA; - config.link_enc_idx = pipe_ctx->stream->link->link_enc->transmitter - TRANSMITTER_UNIPHY_A; - config.phy_idx = pipe_ctx->stream->link->link_enc->transmitter - TRANSMITTER_UNIPHY_A; + if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_PHY) { + link_enc = pipe_ctx->stream->link->link_enc; + config.phy_idx = link_enc->transmitter - TRANSMITTER_UNIPHY_A; + } else if (pipe_ctx->stream->link->dc->res_pool->funcs->link_encs_assign) { + /* Use link encoder assignment from current DC state - which may differ from the DC state to be + * committed - when updating PSP config. + */ + link_enc = link_enc_cfg_get_link_enc_used_by_stream( + pipe_ctx->stream->link->dc->current_state, + pipe_ctx->stream); + config.phy_idx = 0; /* Clear phy_idx for non-physical display endpoints. */ + } + ASSERT(link_enc); + if (link_enc) + config.link_enc_idx = link_enc->transmitter - TRANSMITTER_UNIPHY_A; if (is_dp_128b_132b_signal(pipe_ctx)) { config.stream_enc_idx = pipe_ctx->stream_res.hpo_dp_stream_enc->id - ENGINE_ID_HPO_DP_0; config.link_enc_idx = pipe_ctx->stream->link->hpo_dp_link_enc->inst; @@ -3576,6 +3593,7 @@ void core_link_enable_stream( struct dc_stream_state *stream = pipe_ctx->stream; struct dc_link *link = stream->sink->link; enum dc_status status; + struct link_encoder *link_enc; #if defined(CONFIG_DRM_AMD_DC_DCN) enum otg_out_mux_dest otg_out_dest = OUT_MUX_DIO; #endif @@ -3585,15 +3603,22 @@ void core_link_enable_stream( dc_is_virtual_signal(pipe_ctx->stream->signal)) return; + if (dc->res_pool->funcs->link_encs_assign && stream->link->ep_type != DISPLAY_ENDPOINT_PHY) + link_enc = stream->link_enc; + else + link_enc = stream->link->link_enc; + ASSERT(link_enc); + #if defined(CONFIG_DRM_AMD_DC_DCN) if (!dc_is_virtual_signal(pipe_ctx->stream->signal) && !is_dp_128b_132b_signal(pipe_ctx)) { #else if (!dc_is_virtual_signal(pipe_ctx->stream->signal)) { #endif - stream->link->link_enc->funcs->setup( - stream->link->link_enc, - pipe_ctx->stream->signal); + if (link_enc) + link_enc->funcs->setup( + link_enc, + pipe_ctx->stream->signal); pipe_ctx->stream_res.stream_enc->funcs->setup_stereo_sync( pipe_ctx->stream_res.stream_enc, pipe_ctx->stream_res.tg->inst, @@ -3748,9 +3773,10 @@ void core_link_enable_stream( #else if (!dc_is_virtual_signal(pipe_ctx->stream->signal)) #endif - stream->link->link_enc->funcs->setup( - stream->link->link_enc, - pipe_ctx->stream->signal); + if (link_enc) + link_enc->funcs->setup( + link_enc, + pipe_ctx->stream->signal); dc->hwss.enable_stream(pipe_ctx); 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 e573b0cea9a2..07c2343185bd 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 @@ -2624,13 +2624,27 @@ static enum dc_link_rate get_lttpr_max_link_rate(struct dc_link *link) bool dc_link_dp_get_max_link_enc_cap(const struct dc_link *link, struct dc_link_settings *max_link_enc_cap) { + struct link_encoder *link_enc = NULL; + if (!max_link_enc_cap) { DC_LOG_ERROR("%s: Could not return max link encoder caps", __func__); return false; } - if (link->link_enc->funcs->get_max_link_cap) { - link->link_enc->funcs->get_max_link_cap(link->link_enc, max_link_enc_cap); + /* Links supporting dynamically assigned link encoder will be assigned next + * available encoder if one not already assigned. + */ + if (link->is_dig_mapping_flexible && + link->dc->res_pool->funcs->link_encs_assign) { + link_enc = link_enc_cfg_get_link_enc_used_by_link(link->dc->current_state, link); + if (link_enc == NULL) + link_enc = link_enc_cfg_get_next_avail_link_enc(link->dc, link->dc->current_state); + } else + link_enc = link->link_enc; + ASSERT(link_enc); + + if (link_enc && link_enc->funcs->get_max_link_cap) { + link_enc->funcs->get_max_link_cap(link_enc, max_link_enc_cap); return true; } @@ -2646,9 +2660,23 @@ static struct dc_link_settings get_max_link_cap(struct dc_link *link) #if defined(CONFIG_DRM_AMD_DC_DCN) enum dc_link_rate lttpr_max_link_rate; #endif + struct link_encoder *link_enc = NULL; + + /* Links supporting dynamically assigned link encoder will be assigned next + * available encoder if one not already assigned. + */ + if (link->is_dig_mapping_flexible && + link->dc->res_pool->funcs->link_encs_assign) { + link_enc = link_enc_cfg_get_link_enc_used_by_link(link->dc->current_state, link); + if (link_enc == NULL) + link_enc = link_enc_cfg_get_next_avail_link_enc(link->dc, link->dc->current_state); + } else + link_enc = link->link_enc; + ASSERT(link_enc); /* get max link encoder capability */ - link->link_enc->funcs->get_max_link_cap(link->link_enc, &max_link_cap); + if (link_enc) + link_enc->funcs->get_max_link_cap(link_enc, &max_link_cap); #if defined(CONFIG_DRM_AMD_DC_DCN) if (max_link_cap.link_rate >= LINK_RATE_UHBR10 && !link->hpo_dp_link_enc) @@ -2867,7 +2895,7 @@ bool dp_verify_link_cap( * PHY will sometimes be in bad state on hotplugging display from certain USB-C dongle, * so add extra cycle of enabling and disabling the PHY before first link training. */ - if (link->link_enc->features.flags.bits.DP_IS_USB_C && + if (link->link_enc && link->link_enc->features.flags.bits.DP_IS_USB_C && link->dc->debug.usbc_combo_phy_reset_wa) { dp_enable_link_phy(link, link->connector_signal, dp_cs_id, cur); dp_disable_link_phy(link, link->connector_signal); diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c index de80a9ea4cfa..49b17bbea8d1 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_enc_cfg.c @@ -139,7 +139,7 @@ static struct dc_stream_state *get_stream_using_link_enc( for (i = 0; i < state->stream_count; i++) { struct link_enc_assignment assignment = state->res_ctx.link_enc_assignments[i]; - if (assignment.valid && (assignment.eng_id == eng_id)) { + if ((assignment.valid == true) && (assignment.eng_id == eng_id)) { stream_idx = i; break; } @@ -254,7 +254,7 @@ struct dc_link *link_enc_cfg_get_link_using_link_enc( for (i = 0; i < state->stream_count; i++) { struct link_enc_assignment assignment = state->res_ctx.link_enc_assignments[i]; - if (assignment.valid && (assignment.eng_id == eng_id)) { + if ((assignment.valid == true) && (assignment.eng_id == eng_id)) { stream_idx = i; break; } @@ -274,7 +274,6 @@ struct link_encoder *link_enc_cfg_get_link_enc_used_by_link( { struct link_encoder *link_enc = NULL; struct display_endpoint_id ep_id; - int stream_idx = -1; int i; ep_id = (struct display_endpoint_id) { @@ -283,20 +282,15 @@ struct link_encoder *link_enc_cfg_get_link_enc_used_by_link( for (i = 0; i < state->stream_count; i++) { struct link_enc_assignment assignment = state->res_ctx.link_enc_assignments[i]; - - if (assignment.valid && + if (assignment.valid == true && assignment.ep_id.link_id.id == ep_id.link_id.id && assignment.ep_id.link_id.enum_id == ep_id.link_id.enum_id && assignment.ep_id.link_id.type == ep_id.link_id.type && assignment.ep_id.ep_type == ep_id.ep_type) { - stream_idx = i; - break; + link_enc = link->dc->res_pool->link_encoders[assignment.eng_id - ENGINE_ID_DIGA]; } } - if (stream_idx != -1) - link_enc = state->streams[stream_idx]->link_enc; - return link_enc; } @@ -313,3 +307,14 @@ struct link_encoder *link_enc_cfg_get_next_avail_link_enc( return link_enc; } + +struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream( + struct dc_state *state, + const struct dc_stream_state *stream) +{ + struct link_encoder *link_enc; + + link_enc = link_enc_cfg_get_link_enc_used_by_link(state, stream->link); + + return link_enc; +} diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c index b9570b7c557b..dae0ab761b61 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c @@ -452,9 +452,10 @@ void dp_retrain_link_dp_test(struct dc_link *link, if ((&pipes[i])->stream_res.audio && !link->dc->debug.az_endpoint_mute_only) (&pipes[i])->stream_res.audio->funcs->az_disable((&pipes[i])->stream_res.audio); - link->link_enc->funcs->disable_output( - link->link_enc, - SIGNAL_TYPE_DISPLAY_PORT); + if (link->link_enc) + link->link_enc->funcs->disable_output( + link->link_enc, + SIGNAL_TYPE_DISPLAY_PORT); /* Clear current link setting. */ memset(&link->cur_link_settings, 0, diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c index 57420bf10786..8766b124d4b0 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c @@ -2970,7 +2970,8 @@ enum dc_status dc_validate_stream(struct dc *dc, struct dc_stream_state *stream) res = DC_FAIL_CONTROLLER_VALIDATE; if (res == DC_OK) { - if (!link->link_enc->funcs->validate_output_with_stream( + if (link->ep_type == DISPLAY_ENDPOINT_PHY && + !link->link_enc->funcs->validate_output_with_stream( link->link_enc, stream)) res = DC_FAIL_ENC_VALIDATE; } diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c index 2ce668a23fe8..102f76462752 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -46,6 +46,7 @@ #include "transform.h" #include "stream_encoder.h" #include "link_encoder.h" +#include "link_enc_cfg.h" #include "link_hwss.h" #include "dc_link_dp.h" #if defined(CONFIG_DRM_AMD_DC_DCN) @@ -1192,6 +1193,7 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx) struct dc_stream_state *stream = pipe_ctx->stream; struct dc_link *link = stream->link; struct dc *dc = pipe_ctx->stream->ctx->dc; + struct link_encoder *link_enc = NULL; if (dc_is_hdmi_tmds_signal(pipe_ctx->stream->signal)) { pipe_ctx->stream_res.stream_enc->funcs->stop_hdmi_info_packets( @@ -1213,6 +1215,13 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx) dc->hwss.disable_audio_stream(pipe_ctx); + /* Link encoder may have been dynamically assigned to non-physical display endpoint. */ + if (link->ep_type == DISPLAY_ENDPOINT_PHY) + link_enc = link->link_enc; + else if (dc->res_pool->funcs->link_encs_assign) + link_enc = link_enc_cfg_get_link_enc_used_by_link(link->dc->current_state, link); + ASSERT(link_enc); + #if defined(CONFIG_DRM_AMD_DC_DCN) if (is_dp_128b_132b_signal(pipe_ctx)) { pipe_ctx->stream_res.hpo_dp_stream_enc->funcs->disable( @@ -1220,13 +1229,15 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx) setup_dp_hpo_stream(pipe_ctx, false); /* TODO - DP2.0 HW: unmap stream from link encoder here */ } else { - link->link_enc->funcs->connect_dig_be_to_fe( - link->link_enc, + if (link_enc) + link_enc->funcs->connect_dig_be_to_fe( + link_enc, pipe_ctx->stream_res.stream_enc->id, false); } #else - link->link_enc->funcs->connect_dig_be_to_fe( + if (link_enc) + link_enc->funcs->connect_dig_be_to_fe( link->link_enc, pipe_ctx->stream_res.stream_enc->id, false); @@ -1666,8 +1677,9 @@ static void power_down_encoders(struct dc *dc) if (signal != SIGNAL_TYPE_EDP) signal = SIGNAL_TYPE_NONE; - dc->links[i]->link_enc->funcs->disable_output( - dc->links[i]->link_enc, signal); + if (dc->links[i]->ep_type == DISPLAY_ENDPOINT_PHY) + dc->links[i]->link_enc->funcs->disable_output( + dc->links[i]->link_enc, signal); dc->links[i]->link_status.link_active = false; memset(&dc->links[i]->cur_link_settings, 0, diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c index 7daadb6a5233..f37551e00023 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c @@ -1296,7 +1296,7 @@ struct stream_encoder *dcn10_find_first_free_match_stream_enc_for_link( * in daisy chain use case */ j = i; - if (pool->stream_enc[i]->id == + if (link->ep_type == DISPLAY_ENDPOINT_PHY && pool->stream_enc[i]->id == link->link_enc->preferred_engine) return pool->stream_enc[i]; } diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index ffc0b9ab976f..c0aed7d07eeb 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -2381,6 +2381,13 @@ void dcn20_enable_stream(struct pipe_ctx *pipe_ctx) uint32_t active_total_with_borders; uint32_t early_control = 0; struct timing_generator *tg = pipe_ctx->stream_res.tg; + struct link_encoder *link_enc; + + if (link->is_dig_mapping_flexible && + link->dc->res_pool->funcs->link_encs_assign) + link_enc = pipe_ctx->stream->link_enc; + else + link_enc = link->link_enc; /* For MST, there are multiply stream go to only one link. * connect DIG back_end to front_end while enable_stream and @@ -2397,9 +2404,9 @@ void dcn20_enable_stream(struct pipe_ctx *pipe_ctx) link->hpo_dp_link_enc->inst); } - if (!is_dp_128b_132b_signal(pipe_ctx)) - link->link_enc->funcs->connect_dig_be_to_fe( - link->link_enc, pipe_ctx->stream_res.stream_enc->id, true); + if (!is_dp_128b_132b_signal(pipe_ctx) && link_enc) + link_enc->funcs->connect_dig_be_to_fe( + link_enc, pipe_ctx->stream_res.stream_enc->id, true); if (dc_is_dp_signal(pipe_ctx->stream->signal)) dp_source_sequence_trace(link, DPCD_SOURCE_SEQ_AFTER_CONNECT_DIG_FE_BE); diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c index 7bab88356df4..e69f553d680f 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c @@ -87,6 +87,7 @@ #include "dce/dce_aux.h" #include "dce/dce_i2c.h" #include "vm_helper.h" +#include "link_enc_cfg.h" #include "amdgpu_socbb.h" @@ -1596,12 +1597,29 @@ static void get_pixel_clock_parameters( const struct dc_stream_state *stream = pipe_ctx->stream; struct pipe_ctx *odm_pipe; int opp_cnt = 1; + struct dc_link *link = stream->link; + struct link_encoder *link_enc = NULL; for (odm_pipe = pipe_ctx->next_odm_pipe; odm_pipe; odm_pipe = odm_pipe->next_odm_pipe) opp_cnt++; pixel_clk_params->requested_pix_clk_100hz = stream->timing.pix_clk_100hz; - pixel_clk_params->encoder_object_id = stream->link->link_enc->id; + + /* Links supporting dynamically assigned link encoder will be assigned next + * available encoder if one not already assigned. + */ + if (link->is_dig_mapping_flexible && + link->dc->res_pool->funcs->link_encs_assign) { + link_enc = link_enc_cfg_get_link_enc_used_by_stream(stream->link->dc->current_state, stream); + if (link_enc == NULL) + link_enc = link_enc_cfg_get_next_avail_link_enc(stream->link->dc, + stream->link->dc->current_state); + } else + link_enc = stream->link->link_enc; + ASSERT(link_enc); + + if (link_enc) + pixel_clk_params->encoder_object_id = link_enc->id; pixel_clk_params->signal_type = pipe_ctx->stream->signal; pixel_clk_params->controller_id = pipe_ctx->stream_res.tg->inst + 1; /* TODO: un-hardcode*/ diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c index 2434232fb3f5..83f223d745fa 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c @@ -157,6 +157,9 @@ void dcn31_init_hw(struct dc *dc) */ struct dc_link *link = dc->links[i]; + if (link->ep_type != DISPLAY_ENDPOINT_PHY) + continue; + link->link_enc->funcs->hw_init(link->link_enc); /* Check for enabled DIG to identify enabled display */ @@ -184,7 +187,8 @@ void dcn31_init_hw(struct dc *dc) &dpcd_power_state, sizeof(dpcd_power_state)); if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0) { /* blank dp stream before power off receiver*/ - if (dc->links[i]->link_enc->funcs->get_dig_frontend) { + if (dc->links[i]->ep_type == DISPLAY_ENDPOINT_PHY && + dc->links[i]->link_enc->funcs->get_dig_frontend) { unsigned int fe; fe = dc->links[i]->link_enc->funcs->get_dig_frontend( @@ -248,7 +252,8 @@ void dcn31_init_hw(struct dc *dc) for (i = 0; i < dc->link_count; i++) { struct dc_link *link = dc->links[i]; - if (link->link_enc->funcs->is_dig_enabled && + if (link->ep_type == DISPLAY_ENDPOINT_PHY && + link->link_enc->funcs->is_dig_enabled && link->link_enc->funcs->is_dig_enabled(link->link_enc) && dc->hwss.power_down) { dc->hwss.power_down(dc); diff --git a/drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h b/drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h index 883dd8733ea4..2472c9aed095 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h +++ b/drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h @@ -88,4 +88,9 @@ struct link_encoder *link_enc_cfg_get_next_avail_link_enc( const struct dc *dc, const struct dc_state *state); +/* Return DIG link encoder used by stream. NULL if unused. */ +struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream( + struct dc_state *state, + const struct dc_stream_state *stream); + #endif /* DC_INC_LINK_ENC_CFG_H_ */ |