[PATCH 05/33] drm/amd/display: Add minimum Z8 residency debug option

[Qingqing Zhuo]

From: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>

[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....@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                     | 1 +
 drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c | 1 +
 drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c    | 3 ++-
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h 
b/drivers/gpu/drm/amd/display/dc/dc.h
index c3814f40a102..f1ea9031a191 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -795,6 +795,7 @@ 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 54ed3de869d3..8fc89aeb86d4 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 d3ba65efe1d2..f3cfc144e358 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)) {
-- 
2.34.1