linux-kernel - [PATCH 15/17] drm/amd/display: Trigger ALLM if it's available

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Message-ID: <20260119011146.62302-16-tomasz.pakula.oficjalny@gmail.com>
Date: Mon, 19 Jan 2026 02:11:44 +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 15/17] drm/amd/display: Trigger ALLM if it's available

[Why]
ALLM automatically puts TVs into low latency modes (gaming modes) which
we basically always want for PC use, be it gaming, or using precise
inputs like mice and keyboards.

[How]
Read the ALLM info from HDMI caps and use it to determine if ALLM should
be indicated in HDMI Forum vsif. Additionally, make sure VIC modes are
translated in case of ALLM active as VIC cannot be used in conjunction
with hf-vsif. I learned this the hard way...

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@...il.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c          | 4 +++-
 .../gpu/drm/amd/display/modules/info_packet/info_packet.c  | 7 ++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 848c267ef11e..4a7c9f810e35 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -4504,6 +4504,7 @@ static void set_avi_info_frame(
 	unsigned int rid = pipe_ctx->stream->timing.rid;
 	unsigned int fr_ind = pipe_ctx->stream->timing.fr_index;
 	enum dc_timing_3d_format format;
+	bool allm;
 
 	if (stream->avi_infopacket.valid) {
 		*info_packet = stream->avi_infopacket;
@@ -4658,8 +4659,9 @@ static void set_avi_info_frame(
 	if (pipe_ctx->stream->timing.hdmi_vic != 0)
 		vic = 0;
 	format = stream->timing.timing_3d_format;
+	allm = stream->link->local_sink->edid_caps.allm;
 	/*todo, add 3DStereo support*/
-	if (format != TIMING_3D_FORMAT_NONE) {
+	if ((format != TIMING_3D_FORMAT_NONE) || allm) {
 		// Based on HDMI specs hdmi vic needs to be converted to cea vic when 3D is enabled
 		switch (pipe_ctx->stream->timing.hdmi_vic) {
 		case 1:
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 1a1ddcdb4362..0db2db7a197f 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
@@ -540,9 +540,10 @@ void mod_build_hf_vsif_infopacket(const struct dc_stream_state *stream,
 
 		info_packet->valid = false;
 
-		format = stream->timing.timing_3d_format;
-		if (stream->view_format == VIEW_3D_FORMAT_NONE)
-			format = TIMING_3D_FORMAT_NONE;
+		allm = stream->link->local_sink->edid_caps.allm;
+		format = stream->view_format == VIEW_3D_FORMAT_NONE ?
+			 TIMING_3D_FORMAT_NONE :
+			 stream->timing.timing_3d_format;
 		stereo = format != TIMING_3D_FORMAT_NONE;
 		hdmi_vic_mode = is_hdmi_vic_mode(stream);
 
-- 
2.52.0