This is a note to let you know that I've just added the patch titled
drm/amd/display: Add minimum Z8 residency debug option
to the 6.2-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-add-minimum-z8-residency-debug-optio.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f28ec91077e03bf99b57aa4a713ae84d341b294e
Author: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Date: Fri Feb 17 11:17:50 2023 -0500
drm/amd/display: Add minimum Z8 residency debug option
[ Upstream commit 0db13eae41fcc67f408dbb3dfda59633c4fa03fb ]
[Why]
Allows finer control and tuning for debug and profiling.
[How]
Add the debug option into DC. The default remains the same as before
for now.
Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Stable-dep-of: d893f39320e1 ("drm/amd/display: Lowering min Z8 residency time")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 37998dc0fc144..b519602c054b2 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -796,6 +796,7 @@ struct dc_debug_options {
unsigned int force_odm_combine; //bit vector based on otg inst
unsigned int seamless_boot_odm_combine;
unsigned int force_odm_combine_4to1; //bit vector based on otg inst
+ int minimum_z8_residency_time;
bool disable_z9_mpc;
unsigned int force_fclk_khz;
bool enable_tri_buf;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
index 9ffba4c6fe550..5c23c934c9751 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
@@ -887,6 +887,7 @@ static const struct dc_plane_cap plane_cap = {
static const struct dc_debug_options debug_defaults_drv = {
.disable_z10 = false,
.enable_z9_disable_interface = true,
+ .minimum_z8_residency_time = 1000,
.psr_skip_crtc_disable = true,
.disable_dmcu = true,
.force_abm_enable = false,
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
index 859dc67a1fb6b..b6b8be74ee0ea 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
@@ -973,7 +973,8 @@ static enum dcn_zstate_support_state decide_zstate_support(struct dc *dc, struc
else if (context->stream_count == 1 && context->streams[0]->signal == SIGNAL_TYPE_EDP) {
struct dc_link *link = context->streams[0]->sink->link;
struct dc_stream_status *stream_status = &context->stream_status[0];
- bool allow_z8 = context->bw_ctx.dml.vba.StutterPeriod > 1000.0;
+ int minmum_z8_residency = dc->debug.minimum_z8_residency_time > 0 ? dc->debug.minimum_z8_residency_time : 1000;
+ bool allow_z8 = context->bw_ctx.dml.vba.StutterPeriod > (double)minmum_z8_residency;
bool is_pwrseq0 = link->link_index == 0;
if (dc_extended_blank_supported(dc)) {
