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drm/amd/display: Only use analog stream encoder with analog engine

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Some GPUs have analog connectors that work with a DP bridge chip
and don't actually have an internal DAC: Those should not use
the analog stream encoders.

Fixes: 5834c33fd3 ("drm/amd/display: Add concept of analog encoders (v2)")
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 22:08:26 +01:00 committed by Alex Deucher
parent f402898bd1
commit 17ff034f80
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c
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@ -979,7 +979,10 @@ struct stream_encoder *dce100_find_first_free_match_stream_enc_for_link(
struct dc_link *link = stream->link;
enum engine_id preferred_engine = link->link_enc->preferred_engine;
if (dc_is_rgb_signal(stream->signal))
/* Prefer analog engine if the link encoder has one.
* Otherwise, it's an external encoder.
*/
if (dc_is_rgb_signal(stream->signal) && link->link_enc->analog_engine != ENGINE_ID_UNKNOWN)
preferred_engine = link->link_enc->analog_engine;
for (i = 0; i < pool->stream_enc_count; i++) {