linux-kernel - [PATCH v2 0/3] amdgpu: Enable Adaptive Sync over PCON with HDMI VRR

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Message-ID: <20260113214104.146856-1-tomasz.pakula.oficjalny@gmail.com>
Date: Tue, 13 Jan 2026 22:41:01 +0100
From: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
To: alexander.deucher@....com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	harry.wentland@....com,
	sunpeng.li@....com,
	siqueira@...lia.com
Cc: dri-devel@...ts.freedesktop.org,
	amd-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] amdgpu: Enable Adaptive Sync over PCON with HDMI VRR

Adaptive Sync over PCON is only available as FreeSync over HDMI. TVs which do
not support FreeSync, do not have working VRR with DP -> HDMI 2.1 adapters even
though adapters will take care of HDMI VRR info packets.

Since HDMI VRR relies on FRL modes, this will only be enabled for PCONs in the
VRR whitelist. HDMI VRR for native HDMI connector will still not be
possible/attempted.

I myself validated these changes with my Samsung S95B + Bernhard validated on
LG C4 + FreeSync-less Sony Bravia 8. I used Alienware AW3423DWF that only
has HDMI 2.0 to check that FreeSync still triggers properly for "older" hardware

For missing VRRmax or VRRmax == 0, the upper boundary is the currently selected
video mode refresh rate. I wasn't sure how best to implement it but 10000
works since the driver already limits VRR range to the currently selected
video mode and 10000 Hz should be good enough for years to come.

Changes in v2:
- More info parsed from HDMI Forum vsdb
- EDID parsing squashed into one commit
- Support for VRRmax == 0

Tomasz Pakuła (3):
  drm/edid: parse more info from HDMI Forum vsdb
  drm/amd/display: rename PCON adaptive sync types
  drm/amd/display: enable HDMI VRR over PCON

 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 27 +++++++++--
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c |  2 +-
 .../amd/display/modules/inc/mod_info_packet.h |  4 +-
 .../display/modules/info_packet/info_packet.c |  4 +-
 drivers/gpu/drm/drm_edid.c                    | 41 +++++++++++++++-
 include/drm/drm_connector.h                   | 47 +++++++++++++++++++
 6 files changed, 114 insertions(+), 11 deletions(-)

-- 
2.52.0