From: Timur Kristóf Date: Mon, 26 Jan 2026 21:08:36 +0000 (+0100) Subject: drm/amd/display: Implement DAC load detection on external DP bridge encoders X-Git-Tag: v7.1-rc1~167^2~31^2~112 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=213f95dca44e196269958a2580eda5e597d66437;p=thirdparty%2Fkernel%2Flinux.git drm/amd/display: Implement DAC load detection on external DP bridge encoders 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 Reviewed-by: Alex Hung Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c index f947f82013c66..242032c047edf 100644 --- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c +++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c @@ -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) diff --git a/drivers/gpu/drm/amd/display/dc/dc_bios_types.h b/drivers/gpu/drm/amd/display/dc/dc_bios_types.h index 6f96c5cf39fe8..526f71616f94b 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_bios_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_bios_types.h @@ -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); diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c index 3313acf575535..8aafd460c36fd 100644 --- a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c @@ -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; }