linux-kernel - [PATCH AUTOSEL 6.12 30/31] drm/amd/display: Limit Scaling Ratio on DCN3.01

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Message-Id: <20250126145448.930220-30-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:54:46 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Gabe Teeger <Gabe.Teeger@....com>,
	Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
	Tom Chung <chiahsuan.chung@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	harry.wentland@....com,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	simona@...ll.ch,
	srinivasan.shanmugam@....com,
	roman.li@....com,
	rostrows@....com,
	linux@...blig.org,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 30/31] drm/amd/display: Limit Scaling Ratio on DCN3.01

From: Gabe Teeger <Gabe.Teeger@....com>

[ Upstream commit abc0ad6d08440761b199988c329ad7ac83f41c9b ]

[why]
Underflow and flickering was occuring due to high scaling ratios
when resizing videos.

[how]
Limit the scaling ratios by increasing the max scaling factor

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Signed-off-by: Gabe Teeger <Gabe.Teeger@....com>
Signed-off-by: Tom Chung <chiahsuan.chung@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../drm/amd/display/dc/resource/dcn301/dcn301_resource.c  | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn301/dcn301_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn301/dcn301_resource.c
index 7d04739c3ba14..4bbbe07ecde7d 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn301/dcn301_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn301/dcn301_resource.c
@@ -671,9 +671,9 @@ static const struct dc_plane_cap plane_cap = {
 
 	/* 6:1 downscaling ratio: 1000/6 = 166.666 */
 	.max_downscale_factor = {
-			.argb8888 = 167,
-			.nv12 = 167,
-			.fp16 = 167 
+			.argb8888 = 358,
+			.nv12 = 358,
+			.fp16 = 358
 	},
 	64,
 	64
@@ -694,7 +694,7 @@ static const struct dc_debug_options debug_defaults_drv = {
 	.disable_dcc = DCC_ENABLE,
 	.vsr_support = true,
 	.performance_trace = false,
-	.max_downscale_src_width = 7680,/*upto 8K*/
+	.max_downscale_src_width = 4096,/*upto true 4k*/
 	.scl_reset_length10 = true,
 	.sanity_checks = false,
 	.underflow_assert_delay_us = 0xFFFFFFFF,
-- 
2.39.5