queue-6.19/drm-amd-display-enable-dac-in-dce-link-encoder.patch

From 4a67f7de4ea1675139a264c2daf6a3ad7d8ef763 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Mon, 2 Feb 2026 12:25:07 +0100
Subject: drm/amd/display: Enable DAC in DCE link encoder
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Timur Kristóf <timur.kristof@gmail.com>

[ Upstream commit 4bd8b5f8bcb57b430c35494d8a2471ce5fd7661d ]

Ensure that the DAC output is enabled at the correct time by
moving it to the DCE link encoder similarly to how digital
outputs are enabled.

This also removes the call to DAC1EncoderControl from the DCE
HWSS, which always felt like it was a hacky solution.

Fixes: 0fbe321a93ce ("drm/amd/display: Implement DCE analog link encoders (v2)")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../drm/amd/display/dc/dce/dce_link_encoder.c | 18 +++++++++++++
 .../drm/amd/display/dc/dce/dce_link_encoder.h |  5 ++++
 .../amd/display/dc/hwss/dce110/dce110_hwseq.c | 26 +++++++------------
 .../drm/amd/display/dc/hwss/hw_sequencer.h    |  2 ++
 .../drm/amd/display/dc/inc/hw/link_encoder.h  |  2 ++
 .../gpu/drm/amd/display/dc/link/link_dpms.c   | 14 +++++++++-
 6 files changed, 50 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
index 48a1b3b492e7f..bec8dab156eec 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -102,6 +102,7 @@ static const struct link_encoder_funcs dce110_lnk_enc_funcs = {
 	.enable_dp_output = dce110_link_encoder_enable_dp_output,
 	.enable_dp_mst_output = dce110_link_encoder_enable_dp_mst_output,
 	.enable_lvds_output = dce110_link_encoder_enable_lvds_output,
+	.enable_analog_output = dce110_link_encoder_enable_analog_output,
 	.disable_output = dce110_link_encoder_disable_output,
 	.dp_set_lane_settings = dce110_link_encoder_dp_set_lane_settings,
 	.dp_set_phy_pattern = dce110_link_encoder_dp_set_phy_pattern,
@@ -1192,6 +1193,22 @@ void dce110_link_encoder_enable_lvds_output(
 	}
 }
 
+void dce110_link_encoder_enable_analog_output(
+	struct link_encoder *enc,
+	uint32_t pixel_clock)
+{
+	struct dce110_link_encoder *enc110 = TO_DCE110_LINK_ENC(enc);
+	enum bp_result result;
+
+	result = link_dac_encoder_control(enc110, ENCODER_CONTROL_ENABLE, pixel_clock);
+
+	if (result != BP_RESULT_OK) {
+		DC_LOG_ERROR("%s: Failed to execute VBIOS command table!\n",
+			__func__);
+		BREAK_TO_DEBUGGER();
+	}
+}
+
 /* enables DP PHY output */
 void dce110_link_encoder_enable_dp_output(
 	struct link_encoder *enc,
@@ -1776,6 +1793,7 @@ static const struct link_encoder_funcs dce60_lnk_enc_funcs = {
 	.enable_dp_output = dce60_link_encoder_enable_dp_output,
 	.enable_dp_mst_output = dce60_link_encoder_enable_dp_mst_output,
 	.enable_lvds_output = dce110_link_encoder_enable_lvds_output,
+	.enable_analog_output = dce110_link_encoder_enable_analog_output,
 	.disable_output = dce110_link_encoder_disable_output,
 	.dp_set_lane_settings = dce110_link_encoder_dp_set_lane_settings,
 	.dp_set_phy_pattern = dce60_link_encoder_dp_set_phy_pattern,
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
index c58b69bc319b7..6870cb619d208 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
@@ -273,6 +273,11 @@ void dce110_link_encoder_enable_lvds_output(
 	enum clock_source_id clock_source,
 	uint32_t pixel_clock);
 
+/* enables analog output from the DAC */
+void dce110_link_encoder_enable_analog_output(
+	struct link_encoder *enc,
+	uint32_t pixel_clock);
+
 /* disable PHY output */
 void dce110_link_encoder_disable_output(
 	struct link_encoder *enc,
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 c472303276672..5896ce5511ab1 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
@@ -659,20 +659,6 @@ void dce110_update_info_frame(struct pipe_ctx *pipe_ctx)
 	}
 }
 
-static void
-dce110_dac_encoder_control(struct pipe_ctx *pipe_ctx, bool enable)
-{
-	struct dc_link *link = pipe_ctx->stream->link;
-	struct dc_bios *bios = link->ctx->dc_bios;
-	struct bp_encoder_control encoder_control = {0};
-
-	encoder_control.action = enable ? ENCODER_CONTROL_ENABLE : ENCODER_CONTROL_DISABLE;
-	encoder_control.engine_id = link->link_enc->analog_engine;
-	encoder_control.pixel_clock = pipe_ctx->stream->timing.pix_clk_100hz / 10;
-
-	bios->funcs->encoder_control(bios, &encoder_control);
-}
-
 void dce110_enable_stream(struct pipe_ctx *pipe_ctx)
 {
 	enum dc_lane_count lane_count =
@@ -703,8 +689,6 @@ void dce110_enable_stream(struct pipe_ctx *pipe_ctx)
 
 	tg->funcs->set_early_control(tg, early_control);
 
-	if (dc_is_rgb_signal(pipe_ctx->stream->signal))
-		dce110_dac_encoder_control(pipe_ctx, true);
 }
 
 static enum bp_result link_transmitter_control(
@@ -3285,6 +3269,15 @@ void dce110_enable_tmds_link_output(struct dc_link *link,
 	link->phy_state.symclk_state = SYMCLK_ON_TX_ON;
 }
 
+static void dce110_enable_analog_link_output(
+		struct dc_link *link,
+		uint32_t pix_clk_100hz)
+{
+	link->link_enc->funcs->enable_analog_output(
+			link->link_enc,
+			pix_clk_100hz);
+}
+
 void dce110_enable_dp_link_output(
 		struct dc_link *link,
 		const struct link_resource *link_res,
@@ -3422,6 +3415,7 @@ static const struct hw_sequencer_funcs dce110_funcs = {
 	.enable_lvds_link_output = dce110_enable_lvds_link_output,
 	.enable_tmds_link_output = dce110_enable_tmds_link_output,
 	.enable_dp_link_output = dce110_enable_dp_link_output,
+	.enable_analog_link_output = dce110_enable_analog_link_output,
 	.disable_link_output = dce110_disable_link_output,
 };
 
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
index 8ed9eea40c564..4f6bd365e055a 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
@@ -1184,6 +1184,8 @@ struct hw_sequencer_funcs {
 			const struct link_resource *link_res,
 			enum clock_source_id clock_source,
 			uint32_t pixel_clock);
+	void (*enable_analog_link_output)(struct dc_link *link,
+			uint32_t pixel_clock);
 	void (*disable_link_output)(struct dc_link *link,
 			const struct link_resource *link_res,
 			enum signal_type signal);
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
index e638325e35ecf..b1a88618c5bf8 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
@@ -130,6 +130,8 @@ struct link_encoder_funcs {
 	void (*enable_lvds_output)(struct link_encoder *enc,
 		enum clock_source_id clock_source,
 		uint32_t pixel_clock);
+	void (*enable_analog_output)(struct link_encoder *enc,
+		uint32_t pixel_clock);
 	void (*disable_output)(struct link_encoder *link_enc,
 		enum signal_type signal);
 	void (*dp_set_lane_settings)(struct link_encoder *enc,
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
index 6ae1341476171..635f614c06734 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
@@ -2208,6 +2208,18 @@ static enum dc_status enable_link_dp_mst(
 	return enable_link_dp(state, pipe_ctx);
 }
 
+static enum dc_status enable_link_analog(
+		struct dc_state *state,
+		struct pipe_ctx *pipe_ctx)
+{
+	struct dc_link *link = pipe_ctx->stream->link;
+
+	link->dc->hwss.enable_analog_link_output(
+		link, pipe_ctx->stream->timing.pix_clk_100hz);
+
+	return DC_OK;
+}
+
 static enum dc_status enable_link_virtual(struct pipe_ctx *pipe_ctx)
 {
 	struct dc_link *link = pipe_ctx->stream->link;
@@ -2263,7 +2275,7 @@ static enum dc_status enable_link(
 		status = DC_OK;
 		break;
 	case SIGNAL_TYPE_RGB:
-		status = DC_OK;
+		status = enable_link_analog(state, pipe_ctx);
 		break;
 	case SIGNAL_TYPE_VIRTUAL:
 		status = enable_link_virtual(pipe_ctx);
-- 
2.51.0