From: "Timur Kristóf" <timur.kristof@gmail.com>
To: amd-gfx@lists.freedesktop.org, Alexander.Deucher@amd.com,
Christian.Koenig@amd.com,
Mario Limonciello <mario.limonciello@amd.com>,
Ivan Lipski <ivan.lipski@amd.com>, Alex Hung <alex.hung@amd.com>,
Prike Liang <Prike.Liang@amd.com>, Leo Li <sunpeng.li@amd.com>,
Ray Wu <Ray.Wu@amd.com>,
siqueira@igalia.com
Cc: "Timur Kristóf" <timur.kristof@gmail.com>
Subject: [PATCH 02/14] drm/amd/display: Only use analog link encoder with analog engine
Date: Mon, 26 Jan 2026 22:08:25 +0100 [thread overview]
Message-ID: <20260126210837.21885-3-timur.kristof@gmail.com> (raw)
In-Reply-To: <20260126210837.21885-1-timur.kristof@gmail.com>
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 link encoder code path.
Fixes: 0fbe321a93ce ("drm/amd/display: Implement DCE analog link encoders (v2)")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
.../gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c | 3 ++-
drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c | 3 ++-
drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c | 3 ++-
3 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c
index d40d91ec2035..a916872db7bd 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c
@@ -638,7 +638,8 @@ static struct link_encoder *dce100_link_encoder_create(
if (!enc110)
return NULL;
- if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+ if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+ enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
dce110_link_encoder_construct(enc110,
enc_init_data,
&link_enc_feature,
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c
index 068fb1df8d88..90d826237cf0 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c
@@ -733,7 +733,8 @@ static struct link_encoder *dce60_link_encoder_create(
if (!enc110)
return NULL;
- if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+ if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+ enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
dce60_link_encoder_construct(enc110,
enc_init_data,
&link_enc_feature,
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c
index 8687104cabb7..cde2c2cba1dd 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c
@@ -740,7 +740,8 @@ static struct link_encoder *dce80_link_encoder_create(
if (!enc110)
return NULL;
- if (enc_init_data->connector.id == CONNECTOR_ID_VGA) {
+ if (enc_init_data->connector.id == CONNECTOR_ID_VGA &&
+ enc_init_data->analog_engine != ENGINE_ID_UNKNOWN) {
dce110_link_encoder_construct(enc110,
enc_init_data,
&link_enc_feature,
--
2.52.0
next prev parent reply other threads:[~2026-01-26 21:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-26 21:08 [PATCH 00/14] drm/amd/display: Add support for external DP bridge encoders in DC Timur Kristóf
2026-01-26 21:08 ` [PATCH 01/14] drm/amd/display: Use DCE 6 link encoder for DCE 6 analog connectors Timur Kristóf
2026-01-26 21:08 ` Timur Kristóf [this message]
2026-01-26 21:08 ` [PATCH 03/14] drm/amd/display: Only use analog stream encoder with analog engine Timur Kristóf
2026-01-26 21:08 ` [PATCH 04/14] drm/amd/display: Add color depth helper function to BIOS parser Timur Kristóf
2026-01-26 21:08 ` [PATCH 05/14] drm/amd/display: Refactor DAC load detection, move to HWSS Timur Kristóf
2026-01-30 20:00 ` Alex Hung
2026-01-26 21:08 ` [PATCH 06/14] drm/amd/display: Implement BIOS parser external encoder control Timur Kristóf
2026-01-26 21:08 ` [PATCH 07/14] drm/amd/display: Implement DDC probe over AUX channel Timur Kristóf
2026-01-30 19:53 ` Alex Hung
2026-01-26 21:08 ` [PATCH 08/14] drm/amd/display: Add ability for HWSS to prepare the DDC before use Timur Kristóf
2026-01-26 21:08 ` [PATCH 09/14] drm/amd/display: Use preferred DP link rate if specified Timur Kristóf
2026-01-26 21:08 ` [PATCH 10/14] drm/amd/display: Add DCE HWSS support for external DP bridge encoders Timur Kristóf
2026-01-26 21:08 ` [PATCH 11/14] drm/amd/display: Link detection " Timur Kristóf
2026-01-26 21:08 ` [PATCH 12/14] drm/amd/display: Use " Timur Kristóf
2026-01-26 21:08 ` [PATCH 13/14] drm/amd/display: Implement DAC load detection on " Timur Kristóf
2026-01-26 21:08 ` [PATCH 14/14] drm/amdgpu: Use DC by default on CIK APUs Timur Kristóf
2026-02-09 15:35 ` [PATCH 00/14] drm/amd/display: Add support for external DP bridge encoders in DC Rodrigo Siqueira
2026-02-09 18:12 ` Alex Hung
2026-02-09 22:10 ` Timur Kristóf
2026-02-09 23:14 ` Alex Hung
2026-02-16 4:33 ` Alex Hung
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