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drm/amd/display: Implement DAC load detection on external DP bridge encoders

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Use the pre-existing implementation in the BIOS parser, but call
the ExternalEncoderControl function for external encoders instead
of the built-in DAC load detection function.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf 2026-01-26 22:08:36 +01:00 committed by Alex Deucher
parent d0b8bf128c
commit 213f95dca4
3 changed files with 14 additions and 3 deletions
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11
drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
View File

@ -794,11 +794,13 @@ static enum bp_result bios_parser_external_encoder_control(
static enum bp_result bios_parser_dac_load_detection(
struct dc_bios *dcb,
enum engine_id engine_id)
enum engine_id engine_id,
struct graphics_object_id ext_enc_id)
{
struct bios_parser *bp = BP_FROM_DCB(dcb);
struct dc_context *ctx = dcb->ctx;
struct bp_load_detection_parameters bp_params = {0};
struct bp_external_encoder_control ext_cntl = {0};
enum bp_result bp_result = BP_RESULT_UNSUPPORTED;
uint32_t bios_0_scratch;
uint32_t device_id_mask = 0;
@ -824,6 +826,13 @@ static enum bp_result bios_parser_dac_load_detection(
bp_params.engine_id = engine_id;
bp_result = bp->cmd_tbl.dac_load_detection(bp, &bp_params);
} else if (ext_enc_id.id) {
if (!bp->cmd_tbl.external_encoder_control)
return BP_RESULT_UNSUPPORTED;
ext_cntl.action = EXTERNAL_ENCODER_CONTROL_DAC_LOAD_DETECT;
ext_cntl.encoder_id = ext_enc_id;
bp_result = bp->cmd_tbl.external_encoder_control(bp, &ext_cntl);
}
if (bp_result != BP_RESULT_OK)

3
drivers/gpu/drm/amd/display/dc/dc_bios_types.h
View File

@ -102,7 +102,8 @@ struct dc_vbios_funcs {
struct bp_external_encoder_control *cntl);
enum bp_result (*dac_load_detection)(
struct dc_bios *bios,
enum engine_id engine_id);
enum engine_id engine_id,
struct graphics_object_id ext_enc_id);
enum bp_result (*transmitter_control)(
struct dc_bios *bios,
struct bp_transmitter_control *cntl);

3
drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
View File

@ -709,7 +709,8 @@ dce110_dac_load_detect(struct dc_link *link)
struct link_encoder *link_enc = link->link_enc;
enum bp_result bp_result;
bp_result = bios->funcs->dac_load_detection(bios, link_enc->analog_engine);
bp_result = bios->funcs->dac_load_detection(
bios, link_enc->analog_engine, link->ext_enc_id);
return bp_result == BP_RESULT_OK;
}