linux-kernel - [PATCH 17/17] drm/amd/display: Enable HDMI VRR

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Message-ID: <20260119011146.62302-18-tomasz.pakula.oficjalny@gmail.com>
Date: Mon, 19 Jan 2026 02:11:46 +0100
From: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
To: alexander.deucher@....com,
	harry.wentland@....com,
	sunpeng.li@....com
Cc: maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	siqueira@...lia.com,
	dri-devel@...ts.freedesktop.org,
	amd-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	tomasz.pakula.oficjalny@...il.com,
	bernhard.berger@...il.com
Subject: [PATCH 17/17] drm/amd/display: Enable HDMI VRR

[Why]
We'd like to expose VRR functionality to end user if HDMI sink is
advertising it's support.

[How]
VTEM info frame is used to signal HDMI sink that VRR is active.
Use VTEM info packet as vrr_infopacket

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 13 +++++++++++--
 .../gpu/drm/amd/display/modules/freesync/freesync.c |  4 ++++
 .../drm/amd/display/modules/inc/mod_info_packet.h   |  1 +
 .../amd/display/modules/info_packet/info_packet.c   |  1 +
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ef7e02ebda41..75c3c8ad07e5 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9612,6 +9612,9 @@ static void update_freesync_state_on_stream(
 					&new_stream->adaptive_sync_infopacket);
 	}
 
+	if (aconn && aconn->as_type == ADAPTIVE_SYNC_TYPE_HDMI)
+		packet_type = PACKET_TYPE_VTEM;
+
 	mod_freesync_build_vrr_infopacket(
 		dm->freesync_module,
 		new_stream,
@@ -13347,8 +13350,14 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 		}
 
 	/* HDMI */
-	} else if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A && vsdb_freesync) {
-		monitor_range_from_vsdb(connector, &vsdb_info);
+	} else if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
+		/* Prefer HDMI VRR */
+		if (hdmi_vrr->supported) {
+			amdgpu_dm_connector->as_type = ADAPTIVE_SYNC_TYPE_HDMI;
+			monitor_range_from_hdmi(connector, valid_vsdb_cea ? &vsdb_info : NULL);
+		} else if (vsdb_freesync)
+			monitor_range_from_vsdb(connector, &vsdb_info);
+
 		freesync_capable = copy_range_to_amdgpu_connector(connector);
 
 	/* DP -> HDMI PCON */
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index 1aae46d703ba..db197cf048e1 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -27,6 +27,7 @@
 #include "dc.h"
 #include "mod_freesync.h"
 #include "core_types.h"
+#include "mod_info_packet.h"
 
 #define MOD_FREESYNC_MAX_CONCURRENT_STREAMS  32
 
@@ -955,6 +956,9 @@ void mod_freesync_build_vrr_infopacket(struct mod_freesync *mod_freesync,
 		return;
 
 	switch (packet_type) {
+	case PACKET_TYPE_VTEM:
+		mod_build_vtem_infopacket(stream, vrr, infopacket);
+		break;
 	case PACKET_TYPE_FS_V3:
 		build_vrr_infopacket_v3(stream->signal, vrr, app_tf, infopacket, stream->freesync_on_desktop);
 		break;
diff --git a/drivers/gpu/drm/amd/display/modules/inc/mod_info_packet.h b/drivers/gpu/drm/amd/display/modules/inc/mod_info_packet.h
index 7bca0541443c..3fef1890a3fa 100644
--- a/drivers/gpu/drm/amd/display/modules/inc/mod_info_packet.h
+++ b/drivers/gpu/drm/amd/display/modules/inc/mod_info_packet.h
@@ -59,6 +59,7 @@ enum adaptive_sync_type {
 	ADAPTIVE_SYNC_TYPE_PCON_ALLOWED     = 2,
 	ADAPTIVE_SYNC_TYPE_PCON_NOT_ALLOWED = 3,
 	ADAPTIVE_SYNC_TYPE_EDP              = 4,
+	ADAPTIVE_SYNC_TYPE_HDMI             = 5,
 };
 
 enum adaptive_sync_sdp_version {
diff --git a/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c b/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
index 42a736a5509a..e6d3398046d5 100644
--- a/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
+++ b/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
@@ -686,6 +686,7 @@ void mod_build_adaptive_sync_infopacket(const struct dc_stream_state *stream,
 		break;
 	case ADAPTIVE_SYNC_TYPE_NONE:
 	case ADAPTIVE_SYNC_TYPE_PCON_NOT_ALLOWED:
+	case ADAPTIVE_SYNC_TYPE_HDMI:
 	default:
 		break;
 	}
-- 
2.52.0