This is a note to let you know that I've just added the patch titled
drm/amd/display: Change default Z8 watermark values
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-change-default-z8-watermark-values.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8f586cc16c1fc3c2202c9d54563db8c7ed365f82 Mon Sep 17 00:00:00 2001
From: Leo Chen <sancchen@xxxxxxx>
Date: Thu, 13 Apr 2023 17:34:24 -0400
Subject: drm/amd/display: Change default Z8 watermark values
From: Leo Chen <sancchen@xxxxxxx>
commit 8f586cc16c1fc3c2202c9d54563db8c7ed365f82 upstream.
[Why & How]
Previous Z8 watermark values were causing flickering and OTC underflow.
Updating Z8 watermark values based on the measurement.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@xxxxxxx>
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Alan Liu <HaoPing.Liu@xxxxxxx>
Signed-off-by: Leo Chen <sancchen@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn314/dcn314_fpu.c
@@ -149,8 +149,8 @@ struct _vcs_dpi_soc_bounding_box_st dcn3
.num_states = 5,
.sr_exit_time_us = 16.5,
.sr_enter_plus_exit_time_us = 18.5,
- .sr_exit_z8_time_us = 210.0,
- .sr_enter_plus_exit_z8_time_us = 310.0,
+ .sr_exit_z8_time_us = 268.0,
+ .sr_enter_plus_exit_z8_time_us = 393.0,
.writeback_latency_us = 12.0,
.dram_channel_width_bytes = 4,
.round_trip_ping_latency_dcfclk_cycles = 106,
Patches currently in stable-queue which might be from sancchen@xxxxxxx are
queue-6.3/drm-amd-display-change-default-z8-watermark-values.patch
