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drm/amd/display: Fix DVI-D/HDMI adapters

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When the EDID has the HDMI bit, we should simply select
the HDMI signal type even on DVI ports.

For reference see, the legacy amdgpu display code:
amdgpu_atombios_encoder_get_encoder_mode
which selects ATOM_ENCODER_MODE_HDMI for the same case.

This commit fixes DVI connectors to work with DVI-D/HDMI
adapters so that they can now produce output over these
connectors for HDMI monitors with higher bandwidth modes.
With this change, even HDMI audio works through DVI.

For testing, I used a CAA-DMDHFD3 DVI-D/HDMI adapter
with the following GPUs:

Tahiti (DCE 6) - DC can now output 4K 30 Hz over DVI
Polaris 10 (DCE 11.2) - DC can now output 4K 60 Hz over DVI

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Acked-by: Alex Deucher <alexander.deucher@amd.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
2025-08-25 23:33:33 +02:00
committed by Alex Deucher
parent a450d22532
commit 489f0f600c
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/link/link_detection.c
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@@ -1140,6 +1140,10 @@ static bool detect_link_and_local_sink(struct dc_link *link,
if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A &&
!sink->edid_caps.edid_hdmi)
sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
else if (dc_is_dvi_signal(sink->sink_signal) &&
aud_support->hdmi_audio_native &&
sink->edid_caps.edid_hdmi)
sink->sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
if (link->local_sink && dc_is_dp_signal(sink_caps.signal))
dp_trace_init(link);