linux-kernel - [PATCH AUTOSEL 6.9 16/20] drm/amd/display: change dram_clock

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Date: Sun, 30 Jun 2024 20:11:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Paul Hsieh <paul.hsieh@....com>,
	Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
	Zaeem Mohamed <zaeem.mohamed@....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,
	daniel@...ll.ch,
	charlene.liu@....com,
	hamza.mahfooz@....com,
	chiahsuan.chung@....com,
	nicholas.susanto@....com,
	natanel.roizenman@....com,
	ahmed.ahmed@....com,
	Qingqing.Zhuo@....com,
	yang.lee@...ux.alibaba.com,
	syed.hassan@....com,
	jerry.zuo@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.9 16/20] drm/amd/display: change dram_clock_latency to 34us for dcn35

From: Paul Hsieh <paul.hsieh@....com>

[ Upstream commit 6071607bfefefc50a3907c0ba88878846960d29a ]

[Why & How]
Current DRAM setting would cause underflow on customer platform.
Modify dram_clock_change_latency_us from 11.72 to 34.0 us as per recommendation from HW team

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@....com>
Signed-off-by: Paul Hsieh <paul.hsieh@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
index 53e40d3c48d4b..6716696df7719 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c
@@ -177,7 +177,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_5_soc = {
 	.urgent_latency_pixel_data_only_us = 4.0,
 	.urgent_latency_pixel_mixed_with_vm_data_us = 4.0,
 	.urgent_latency_vm_data_only_us = 4.0,
-	.dram_clock_change_latency_us = 11.72,
+	.dram_clock_change_latency_us = 34.0,
 	.urgent_out_of_order_return_per_channel_pixel_only_bytes = 4096,
 	.urgent_out_of_order_return_per_channel_pixel_and_vm_bytes = 4096,
 	.urgent_out_of_order_return_per_channel_vm_only_bytes = 4096,
-- 
2.43.0