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

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Message-ID: <f7eb4d8540e1453fa7612e76ad7b78e5f4c165a4.camel@gmail.com>
Date: Sun, 18 Jan 2026 12:41:14 +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: Re: [PATCH v2 0/3] amdgpu: Enable Adaptive Sync over PCON with HDMI
 VRR

On Tue, 2026-01-13 at 22:41 +0100, Tomasz Pakuła wrote:
> 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(-)

I'd like to inform you that this patch series will be superseded by
another, bigger patch series which compiles my recent work as all the
separate series/patches di conflict with each other.

Thank you.
Tomasz